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Is Stockton Tap Water Safe to Drink?

Yes! Generally Safe to Drink*

LAST UPDATED: 5:09 am, December 21, 2021
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Can You Drink Tap Water in Stockton?

Yes, Stockton's tap water is generally considered safe to drink as Stockton has no active health based violations of the Safe Drinking Water Act (SDWA) that we are aware of. Other factors such as lead piping in a home, or low levels of pollutants on immunocompromised individuals, should also be considered, however. For the latest updates on Stockton water, please check out its Twitter page

According the EPA’s ECHO database, from Oct. 31, 2018 to Dec. 31, 2021, Stockton's water utility, California Water Service - Stockton, had 0 violations of the Safe Drinking Water Act. For more details on the violations, please see our violation history section below. This assessment is based on the California Water Service - Stockton water system, other water systems in the city may have different results.

While tap water that meets the EPA health guidelines generally won’t make you sick to your stomach, it can still contain regulated and unregulated contaminants present in trace amounts that could potentially cause health issues over the long-run. These trace contaminants may also impact immunocompromised and vulnerable individuals.

The EPA is reviewing if it’s current regulations around pollutant levels in tap water are strict enough, and the health dangers posed by unregulated pollutants, like PFAS.

Water Quality Report for Stockton Tap Water

The most recent publicly available numbers for measured contaminant levels in Stockton tap water are in its 2020 Water Quality Report. As you can see, there are levels which the EPA considers to be acceptable, but being below the maximum allowable level doesn’t necessarily mean the water is healthy.

Lead in tap water, for example, is currently allowed at up to 15ppb by the EPA, but it has set the ideal goal for lead at zero. This highlights how meeting EPA standards doesn’t necessarily mean local tap water is healthy.

EPA regulations continue to change as it evaluates the long term impacts of chemicals and updates drinking water acceptable levels. The rules around arsenic, as well as, lead and copper are currently being re-evaluated.

There are also a number of "emerging" contaminants that are not currently. For example, PFAS (Per- and polyfluoroalkyl substances), for which the EPA has issued a health advisory. PFAS are called "forever chemicals" since they tend not to break down in the environment or the human body and can accumulate over time.

We recommend looking at the contaminants present in Stockton's water quality reports, or getting your home's tap water tested to see if you should be filtering your water.

Stockton Tap Water Safe Drinking Water Act Violation History - Prior 10 Years

Below is a ten year history of violations for the water system named California Water Service - Stockton for Stockton in California. For more details please see the "What do these Violations Mean?" section below.

Is there Lead in Stockton Water?

Based on the EPA’s ECHO Database, 90% of the samples taken from the Stockton water system, California Water Service - Stockton, between sample start date and sample end date, were at or below, 0.0 mg/L of lead in Stockton water. This is 0% of the 0.015 mg/L action level. This means 10% of the samples taken from Stockton contained more lead.

While Stockton water testing may have found 0.0 mg/L of lead in its water, that does not mean your water source has the same amount. The amount of lead in water in a city can vary greatly from neighborhood to neighborhood, or even building to building. Many buildings, particularly older ones, have lead pipes or service lines which can be a source of contamination. To find out if your home has lead, we recommend getting you water tested.

No amount of lead in water is healthy, only less dangerous. As lead accumulates in our bodies over time, even exposure to relatively small amounts can have negative health effects. For more information, please check out our Lead FAQ page.

Are there PFAS in Stockton Tap Water?

Currently, testing tap water for PFAS isn’t mandated on a national level. We do have a list of military bases where there have been suspected or confirmed leaks. There appears to be at least one military base - NAVCOMTELSTA STOCKTON - near Stockton with suspected leaks.

With many potential sources of PFAS in tap water across the US, the best information we currently have about which cities have PFAS in their water is this ewg map, which you can check to see if Stockton has been evaluated for yet.

Our stance is better safe than sorry, and that it makes sense to try to purify the tap water just in case.

What do these Violations Mean?

Safe Drinking Water Act Violations categories split into two groups, health based, and non-health based. Generally, health based violations are more serious, though non-health based violations can also be cause for concern.

Health Based Violations

  1. Maximum contaminant levels (MCLs) - maximum allowed contaminant level was exceeded.
  2. Maximum residual disinfectant levels (MRDLs) - maximum allowed disinfectant level was exceeded.
  3. Other violations (Other) - the exact required process to reduce the amounts of contaminants in drinking water was not followed.

Non-Health Based Violations

  1. Monitoring and reporting violations (MR, MON) - failure to conduct the required regular monitoring of drinking water quality, and/or to submit monitoring results on time.
  2. Public notice violations (Other) - failure to immediately alert consumers if there is a serious problem with their drinking water that may pose a risk to public health.
  3. Other violations (Other) - miscellaneous violations, such as failure to issue annual consumer confidence reports or maintain required records.

SDWA Table Key

Field Description
Compliance Period Dates of the compliance period.
Status Current status of the violation.
  • Resolved - The violation has at least one resolving enforcement action. In SDWIS, this indicates that either the system has returned to compliance from the violation, the rule that was violated was no longer applicable, or no further action was needed.
  • Archived - The violation is not Resolved, but is more than five years past its compliance period end date. In keeping with the Enforcement Response Policy, the violation no longer contributes to the public water system's overall compliance status. Unresolved violations are also marked as Archived when a system ceases operations (becomes inactive).
  • Addressed - The violation is not Resolved or Archived, and is addressed by one or more formal enforcement actions.
  • Unaddressed - The violation is not Resolved or Archived, and has not been addressed by formal enforcement.
show details
Health-Based? Whether the violation is health based.
Category Code
The category of violation that is reported.
  • TT - Treatment Technique Violation
  • MRDL - Maximum Residual Disinfectant Level
  • Other - Other Violation
  • MCL - Maximum Contaminant Level Violation
  • MR - Monitoring and Reporting
  • MON - Monitoring Violation
  • RPT - Reporting Violation
show details
Code A full description of violation codes can be accessed in the SDWA_REF_CODE_VALUES (CSV) table.
Contaminant Code A code value that represents a contaminant for which a public water system has incurred a violation of a primary drinking water regulation.
Rule Code Code for a National Drinking Water rule.
  • 110 - Total Coliform Rule
  • 121 - Surface Water Treatment Rule
  • 122 - Long Term 1 Enhanced Surface Water Treatment Rule
  • 123 - Long Term 2 Enhanced Surface Water Treatment Rule
  • 130 - Filter Backwash Rule
  • 140 - Ground Water Rule
  • 210 - Stage 1 Disinfectants and Disinfection Byproducts Rule
  • 220 - Stage 2 Disinfectants and Disinfection Byproducts Rule
  • 230 - Total Trihalomethanes
  • 310 - Volatile Organic Chemicals
  • 331 - Nitrates
  • 332 - Arsenic
  • 333 - Inorganic Chemicals
  • 320 - Synthetic Organic Chemicals
  • 340 - Radionuclides
  • 350 - Lead and Copper Rule
  • 410 - Public Notice Rule
  • 420 - Consumer Confidence Rule
  • 430 - Miscellaneous
  • 500 - Not Regulated
  • 111 - Revised Total Coliform Rule
show details
Rule Group Code Code that uniquely identifies a rule group.
  • 120 - Surface Water Treatment Rules
  • 130 - Filter Backwash Rule
  • 140 - Groundwater Rule
  • 210 - Stage 1 Disinfectants and Disinfection Byproducts Rule
  • 220 - Stage 2 Disinfectants and Disinfection Byproducts Rule
  • 230 - Total Trihalomethanes
  • 310 - Volatile Organic Chemicals
  • 320 - Synthetic Organic Chemicals
  • 330 - Inorganic Chemicals
  • 340 - Radionuclides
  • 350 - Lead and Copper Rule
  • 400 - Other
  • 500 - Not Regulated
  • 110 - Total Coliform Rules
  • 410 - Public Notice Rule
  • 420 - Consumer Confidence Rule
  • 430 - Miscellaneous
show details
Rule Family Code Code for rule family.
  • 100 - Microbials
  • 200 - Disinfectants and Disinfection Byproducts Rule
  • 300 - Chemicals
  • 400 - Other
  • 500 - Not Regulated
show details

For more clarification please visit the EPA's data dictionary.

Stockton Water - Frequently Asked Questions

HOW DO I CONTACT STOCKTON CUSTOMER SERVICE?
To contact customer service for the Stockton water provider, California Water Service - Stockton, please use the information below.
By Phone: 408-367-8593
By Email: sjames@calwater.com
By Mail: 1720 North First Street
SAN JOSE, CA, 95112-4508
HOW TO PAY BILL FOR CALIFORNIA WATER SERVICE - STOCKTON
Already have an account?

Existing customers can login to their California Water Service - Stockton account to pay their Stockton water bill by clicking here.

Want to create a new account?

If you want to pay your California Water Service - Stockton bill online and haven't made an account yet, you can create an account online. Please click here to create your account to pay your Stockton water bill.

Want to pay without an account?

If you don't want to make an account, or can't remember your account, you can make a one-time payment towards your Stockton water bill without creating an account using a one time payment portal with your account number and credit or debit card. Click here to make a one time payment.

HOW TO START & STOP STOCKTON WATER SERVICE
Starting Your Service

Moving to a new house or apartment in Stockton means you will often need to put the water in your name with California Water Service - Stockton. In order to put the water in your name, please click the link to the start service form below. Start service requests for water bills typically take two business days.

Start Service Form

Want to create a new account?

Leaving your house or apartment in Stockton means you will likely need to take your name off of the water bill with California Water Service - Stockton. In order to take your name off the water bill, please click the link to the stop service form below. Stop service for water bills requests typically take two business days.

Stop Service Form

Is Stockton Tap Water Safe to Drink? Tap water & safety quality

The estimated price of bottled water

$2.12 in USD (1.5-liter)

USER SUBMITTED RATINGS

Stockton tap water
  • Drinking Water Pollution and Inaccessibility 50% Moderate
  • Water Pollution 71% High
  • Drinking Water Quality and Accessibility 50% Moderate
  • Water Quality 29% Low

The above data is comprised of subjective, user submitted opinions about the water quality and pollution in Stockton, measured on a scale from 0% (lowest) to 100% (highest).

Related FAQS

Stockton Water Quality Report (Consumer Confidence Report)

The EPA mandates that towns and cities consistently monitor and test their tap water. They must report their findings in an annual Consumer Confidence Report. Below is the most recent water quality report from Stockton's Water. If you would like to see the original version of the report, please click here.

2020

Water Quality Report

Stockton DISTRICT





Tradúzcalo o hable con alguien que lo entienda bien.

Quality. Service.Value.®

Este informe contiene información muy importante sobre su agua potable.

 

TABLE OF CONTENTS

WELCOME

YOUR WATER

2020 RESULTS

MORE INFO

Table of Contents

WELCOME

YOUR WATER SYSTEM

2020 TEST RESULTS

MORE INFORMATION

From the Manager

Your Water System

Fluoride

Online Resources

 

The Water Quality Lab

Water Hardness

 

 

Cross-Connection Control

Possible Contaminants

 

 

DWSAPP

About Lead

 

 

 

PFOA and PFOS

 

 

 

Key Definitions

 

 

 

Water Quality Table

 

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Welcome

Since 1926, California Water Service (Cal Water) has been committed to providing safe, reliable, high-quality water to our customers and communities. When the coronavirus pandemic began in 2020, access to clean water became particularly top of mind. During these difficult times, our commitment to our customers remained as strong as ever.

In this system in 2020, we conducted 29,078 tests on 3,735 water samples for 248 constituents. We are pleased to confirm that we met every primary and

secondary federal and state water quality standard last year.

Our promise to provide quality, service, and value means more than just treatment and testing. It means having expert professionals available to assist with routine services in a safe and efficient manner. It means having personnel available to handle emergencies 24 hours per day. It means maintaining and upgrading the infrastructure needed to transport water through a network

of pumps, tanks, and pipes to your tap. It also means that, even with costs increasing across the country, we do everything we can to operate as efficiently as possible to keep your water affordable.

I encourage you to review this annual water quality report, also called your Consumer Confidence Report, as it details any constituents detected in your water supply in 2020 and shows how your water compares to federal and state standards. It also provides information on current water quality issues and steps we are taking to protect your health and safety.

If you have any questions, we are here to assist you. You can reach us by phone or email at our local Customer Center, or online at www.calwater.com. You can also get water service news on our web site, via our Facebook, Twitter, and Instagram pages, and in your monthly bill. And, please be sure your contact information with Cal Water is up to date by visiting ccu.calwater.com, to ensure we can reach you with important emergency and other information.

Sincerely,

Jeremiah Mecham, District Manager, Stockton District

[Stockton District  1505 East Sonora Street  Stockton, CA 95205  (209) 547-7900]

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Your Water System

Cal Water has provided high-quality water utility services in Stockton since 1927. To meet the needs of our customers, we use a combination of local groundwater and water purchased from the Stockton East Water District, which is obtained from the New Melones and New Hogan Reservoirs. The Stockton system includes 25 active wells, 14 booster pumps, and

9 storage tanks.

Our company-wide water quality assurance program includes vigilant monitoring throughout our systems and testing at our state-of-the-art laboratory. Additionally, we proactively maintain and upgrade our facilities to ensure a reliable, high-quality supply.

If you have any questions, suggestions, or concerns, please contact our local Customer Center, either by phone at (209) 547-7900 or through the Contact Us link at www.calwater.com.

WATER RESOURCE SUSTAINABILITY

Cal Water helps our customers conserve water by offering programs and incentives to reduce indoor and outdoor water use, develop more efficient habits, and educate the next generation about the importance of managing water resources sustainably. We also continue to invest diligently in our infrastructure to reduce the amount of water lost to pipeline leaks and are updating our assessment of the impacts of climate change on water supply and demand. As we await more information on the long-term water-use regulations from the State of California, it’s important that we make water-use efficiency a way of life. Using water wisely will ensure that we have enough water in dry years and for generations to come.

Visit www.calwater.com/conservation for details.

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Water Quality

THE WATER QUALITY LAB

Water professionals collect samples from throughout the water system for testing at our state-of-the-art water quality laboratory, which

is certified each year through the stringent Environmental Laboratory Accreditation Program (ELAP). Scientists, chemists, and microbiologists test the water for 326 constituents with equipment so sensitive it can detect levels as low as one part per trillion. In order to maintain the ELAP certification, all of our scientists must pass blind-study proficiency tests for every water quality test performed. Water quality test results are entered into our Laboratory Information Management System (LIMS), a sophisticated software program that enables us to react quickly to changes in water quality and analyze water quality trends in order to plan effectively for future needs.

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CROSS-CONNECTION CONTROL

To ensure that the high-quality water we deliver is not compromised in the distribution system, Cal Water has a robust cross-connection control program in place. Cross- connection control is critical to ensuring that activities on customers’ properties do not affect the public water supply. Our cross-connection control specialists ensure that all of the existing backflow prevention assemblies are tested annually, assess all connections, and enforce and manage the installation of new commercial and residential assemblies.

Backflow can occur when certain pressure conditions exist either in our distribution system or within the customer’s plumbing, so our customers are our first line of defense. A minor home improvement project—without the proper protections—can create a potentially hazardous situation, so careful adherence to plumbing codes and standards will ensure the community’s water supply remains safe. Please be sure to utilize the advice or services of a qualified plumbing professional.

Many water-use activities involve substances that, if allowed to enter the distribution system, would be aesthetically displeasing or could even present health concerns. Some common cross-connections are:

  • Garden hoses connected to a hose bib without a simple hose-type vacuum breaker (available at a home improvement store)
  • Improperly installed toilet tank fill valves that do not have the required air gap between the valve or refill tube
  • Landscape irrigation systems that do not have the proper backflow prevention assembly installed on the supply line

The list of materials that could potentially contaminate the water system is vast. According to the EPA, a wide variety of substances have contaminated drinking water systems throughout the country as a result of poor cross-connection control. Examples include:

  • Antifreeze from a heating system
  • Lawn chemicals from a garden hose or sprinkler head
  • Blue water from a toilet tank
  • Carbonated water from a soda dispenser

Customers must ensure that all plumbing is in conformance with local plumbing codes. Additionally, state law requires certain types of facilities to install and maintain backflow prevention assemblies at the water meter. Cal Water’s cross-connection control staff will determine whether you need to install a backflow prevention assembly based on water uses at your location.

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DWSAPP

By the end of 2002, Cal Water had submitted to the Division of Drinking Water (DDW) a Drinking Water Source Assessment and Protection Program (DWSAPP) report for each water source in the water system. The DWSAPP report identifies possible sources of contamination to aid in prioritizing cleanup and pollution prevention efforts. All reports are available for viewing or copying at our Customer Center.

The water sources in your district are considered most vulnerable to the following activities associated with contaminants detected in the water supply:

• Sewer collection systems

• Septic tanks

• Agricultural drainage

• Historic railroad right-of-ways

• Irrigated crops

• Chemical/petroleum processing or

• Fertilizer/pesticide/herbicide

storage

applications

• Farm chemical distributor/

• Pesticide/fertilizer/petroleum

application service

storage and transfer areas

• Farm machinery repair

• Appliance/electronic repair

• Automobile body and repair shops

• Junk/scrap/salvage yards

• Fleet/truck/bus terminals

• Machine shops

• Car washes

• Metal plating/finishing/fabricating

• Road right-of-ways

• Golf courses

• Wells (water supply)

• Parks

• Lumber processing/manufacturing

• RV parks

• Electrical/electronic manufacturing

• Medical/dental offices/clinics

• Hardware/lumber/parts stores

• Hospitals

 

The water sources are considered most vulnerable to the following activities, for which no associated contaminant has been detected:

• Gas stations

• Recreational areas (surface water

• Underground storage tanks

source)

(confirmed leaking tanks)

• Wells (agricultural)

• Dry cleaners

• Photo processing/printing

• Railroad yards/maintenance/fueling

• Storm drain discharge points

areas

 

We encourage customers to join us in our efforts to prevent water pollution and protect our most precious natural resource.

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2020 Results

FLUORIDE

State law requires Cal Water to add fluoride to drinking water if public funding is available to pay for it, and it is a practice endorsed by the American Medical Association and the American Dental Association to prevent tooth decay. In this area, low levels of fluoride occur naturally, and Cal Water doesn’t add any to the water supply. Show the table in this report to your dentist to see if he or she recommends giving your children fluoride supplements.

More information about fluoridation, oral health, and related issues can be found on the DDW web site at www.waterboards.ca.gov/ drinking_water/certlic/drinkingwater/Fluoridation.html. For general information on water fluoridation, visit us online at www.calwater.com.

WATER HARDNESS

Hardness is a measure of the magnesium, calcium, and carbonate minerals in the water. Water is considered soft if its hardness is less than 75 parts per million (ppm), moderately hard at 75 to 150 ppm, hard between 150 and 300 ppm, and very hard at 300 ppm or higher.

Hard water is generally not a health concern, but it can have an impact on how well soap lathers and is significant for some industrial and manufacturing processes. Hard water may also lead to mineral buildup in pipes or water heaters.

Some people with hard water opt to buy a water softener for aesthetic reasons; however, some water softeners add salt to the water, which can cause problems at wastewater treatment plants. Additionally, people on low-sodium diets should be aware that some water softeners increase the sodium content of the water.

For more information on water hardness, visit www.calwater.com/video/hardness.

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Possible Contaminants

All drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. The presence of contaminants does not necessarily indicate that water poses a health risk.

More information about contaminants and potential health effects can be obtained by calling the United States Environmental Protection Agency (EPA) Safe Drinking Water Hotline at (800) 426-4791.

The sources of drinking water (both tap and bottled) include rivers, lakes, streams, ponds, reservoirs, springs, and wells. As water travels over the surface of the land or through the ground, it dissolves naturally occurring minerals and, in some cases, radioactive material, and can pick up substances resulting from the presence of animals or human activity.

CONTAMINANTS THAT MAY BE PRESENT IN SOURCE WATER INCLUDE:

Microbial contaminants, such as viruses and bacteria, which may come from sewage treatment plants, septic systems, agricultural livestock operations, and wildlife.

Inorganic contaminants, such as salts and metals, which can be naturally occurring or result from urban stormwater runoff, industrial or domestic wastewater discharges, oil and gas production, mining, or farming.

Pesticides and herbicides, which may come from a variety of sources such as agriculture, urban stormwater runoff, and residential uses.

Organic chemical contaminants, including synthetic and volatile organic chemicals, which are byproducts of industrial processes and petroleum production, and can also come from gas stations, urban stormwater runoff, agricultural application, and septic systems.

Radioactive contaminants, which can be naturally occurring or the result of oil and gas production and mining activities.

In order to ensure that tap water is safe to drink, the EPA and DDW prescribe regulations that limit the amount of certain contaminants in water provided by public water systems. FDA regulations establish limits for contaminants in bottled water, which must provide the same protection for public health.

Some people may be more vulnerable to contaminants in drinking water than the general population. Immunocompromised people, such as those with cancer undergoing chemotherapy, those who have undergone organ transplants, and those with HIV/AIDS or other immune system disorders; some elderly people; and infants can be particularly at risk from infections. These people should seek advice from their health care providers about drinking water. EPA and Centers for Disease Control and Prevention (CDC) guidelines on appropriate means to lessen the risk of infection by cryptosporidium and other microbial contaminants are available from the Safe Drinking Water Hotline.

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About Lead

As the issue of lead in water continues to be top of mind for many Americans, Cal Water wants to assure you about the quality of your water. We are compliant with health and safety codes mandating use of lead-free materials in water system replacements, repairs, and new installations. We have no known lead service lines in our systems. We test and treat (if necessary) water sources to ensure that the water delivered to customer meters meets all water quality standards and is not corrosive toward plumbing materials.

The water we deliver to your home meets lead standards. However, if present, elevated levels of lead can cause serious health problems, especially for pregnant women and young children. Lead in drinking water is primarily from materials and components associated with service lines and home plumbing (for example, lead solder used to join copper plumbing, and brass and other lead-containing fixtures).

Cal Water is responsible for providing high-quality drinking water to our customers’ meters, but cannot control the variety of materials used in plumbing components. When your water has been sitting for several hours, you can minimize the potential for lead exposure by flushing your tap for 30 seconds to 2 minutes before using water for drinking or cooking.

If you are concerned about lead in your water, you may wish to have your water tested by a certified lab. More information about lead in drinking water can be found on the Safe Drinking Water Hotline or at www.epa.gov/safewater/lead.

In your system, results from our lead monitoring program, conducted in accordance with the Lead and Copper Rule, were below the action level for the presence of lead.

Testing for Lead in Schools

The State of California required that all public schools built before 2010 test for lead in their drinking water by July 1,

2019. We are committed to supporting our school districts’ efforts to protect students and ensure that the drinking water at their school sites are below lead limits. We worked with all school districts in our service area that serve kindergarten through 12th grade to develop sampling plans, test samples, and conduct follow-up monitoring, if needed, for corrective actions.

For more information, please see our Testing for Lead in Schools web page. For specific information regarding local school data, see the state web portal.

Lead and Copper Rule

The lead and copper rule requires us to test water inside a representative number of homes that have plumbing most likely to contain lead and/or lead solder to determine the presence of lead and copper or any action level exceedance (AL). An action level is the concentration of a contaminant which, when exceeded,

triggers corrective actions before it becomes a health concern. If action levels are exceeded, either at a customer’s home or system-wide, we work with the customer to investigate the issue and/or implement corrosion control treatment to reduce lead levels.

Lead Service Line Inventory (LSLI)

Protecting our customers’ health and safety is our highest priority. As part of this commitment, we have been working to identify and replace any old customer water service lines and fittings that may contain lead. California Senate Bill (SB) 1398 required all water utilities in California to develop an inventory of all distribution service line materials, and submit a list of known service lines to the state by 2018. A list of unknown service lines that may contain lead, along with a plan for replacement, was due to the state by July 1, 2020. Known lines are replaced as soon as possible.

More information regarding LSLI and specific data for each water system can be found on the state web site.

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PFOA and PFOS

PFOS and PFOA are manmade compounds used prevalently in firefighting foams and to make carpets, clothing, fabrics for furniture, paper packaging for food, cookware, and other items resistant to water, grease, fire, or stains. They are also used in a number of industrial processes. They are part of a larger group of chemicals referred to as per- and poly-fluoroalkyl substances (PFAS).

In early 2020, DDW announced lower response levels for PFOA and PFOS (10 ppt for PFOA, and 40 ppt for PFOS) from the previous level of 70 ppt combined. The notification levels (5.1 ppt for PFOA, and 6.5 ppt for PFOS) were not changed.

Knowing that these are constituents of emerging concern, Cal Water had identified and tested water sources in 2019 and earlier that would be more likely to have these compounds present. With the updated response levels, we have conducted additional testing for these constituents in all of our water systems.

Studies indicate that long-term exposure to PFOS and PFOA over certain levels could have adverse health effects, including developmental effects to fetuses during pregnancy or infants; cancer; or liver, immunity, thyroid, and other effects. Potential health impacts related to PFAS compounds are still being studied, and research is still evolving on this issue.

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Although there is no Maximum Contaminant Level (MCL) set for these substances, we have proactively monitored sources and will continue to do so. Even though it is not required by the state, we believe it is the right thing to do. When an MCL is established by DDW for these compounds, we will continue to ensure our water sources are in compliance with any set standard.

While we are doing our part to treat the water and meet the standards the public

 

health experts have set, it’s important that our population as a whole focuses on

 

being good stewards of the environment and takes steps to prevent impacting

 

the water supply. Additionally, Cal Water has filed a lawsuit against a group of

 

companies that manufactured and sold firefighting foam products that released

 

the PFOS and PFOA into the environment, to ensure the responsible parties

 

bear the costs of treating for these chemicals, not our customers. We are also

 

encouraging the EPA to establish a consistent, science-based standard as

 

quickly as feasible, and strongly support state legislation prohibiting the sale

 

and use of certain products that contain PFAS and requiring the certification of

 

accurate testing methods for PFAS.

 

More information on PFOS and PFOA is available on the DDW web site.

 

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Key Definitions

MAXIMUM CONTAMINANT LEVEL (MCL)

The highest level of a contaminant that is allowed in drinking water. Primary MCLs protect public health and are set as close to the PHGs (or MCLGs) as are economically and technologically feasible. Secondary MCLs (SMCLs) relate to the odor, taste, and appearance of drinking water.

IN COMPLIANCE

Does not exceed any applicable MCL, SMCL, or action level, as determined by DDW. For some compounds, compliance is determined by averaging the results for one source over a one-year period.

REGULATORY ACTION LEVEL (AL)

The concentration of a contaminant which, if exceeded, triggers treatment or other required action by the water provider.

MAXIMUM CONTAMINANT LEVEL GOAL (MCLG)

The level of a contaminant in drinking water below which there is no known or expected risk to health. MCLGs are set by the EPA.

MAXIMUM RESIDUAL DISINFECTANT LEVEL (MRDL)

The highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants.

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MAXIMUM RESIDUAL DISINFECTANT LEVEL GOAL (MRDLG)

The level of a drinking water disinfectant below which there is no known or expected risk to health. MRDLGs are set by the EPA and do not reflect the benefits of the use of disinfectants to control microbial contaminants.

NON-DETECT (ND)

The constituent was not detected.

 

NOTIFICATION LEVEL (NL) AND RESPONSE LEVEL (RL)

Health-based advisory levels for unregulated contaminants in drinking water. They are used by DDW to provide guidance to drinking water systems.

PRIMARY DRINKING WATER STANDARD (PDWS)

MCLs and MRDLs for contaminants that affect health, along with their monitoring, reporting, and water treatment requirements.

PUBLIC HEALTH GOAL (PHG)

The level of a contaminant in drinking water below which there is no known or expected risk to health. PHGs are set by the California Environmental Protection Agency’s Office of Environmental Health Hazard Assessment without regard to cost or available detection and treatment technologies.

TREATMENT TECHNIQUE (TT)

A required process intended to reduce the level of a contaminant in drinking water.

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Table Introduction

CAL WATER TESTS YOUR WATER FOR MORE THAN 140 REGULATED CONTAMINANTS AND DOZENS OF UNREGULATED CONTAMINANTS. THIS TABLE LISTS ONLY THOSE CONTAMINANTS THAT WERE DETECTED.

In the table, water quality test results are divided into four major sections:

“Primary Drinking Water Standards,” “Secondary Drinking Water Standards,”

 

 

“State-Regulated Contaminants with Notification Levels,” and “Unregulated

 

Compounds.” Primary standards protect public health by limiting the levels

 

of certain constituents in drinking water. Secondary standards are set for

 

substances that don’t impact health but could affect the water’s taste, odor,

 

or appearance. Some unregulated substances (hardness and sodium, for

 

example) are included for your information. The State allows us to monitor

 

for some contaminants less than once per year because the concentrations

 

of these contaminants do not change frequently. Some of our data, though

 

representative, are more than one year old.

12

SUBSTANCE SOURCES

DI

Byproduct of drinking water disinfection

 

DS

Drinking water disinfectant added for treatment

 

EN

Naturally present in the environment

 

ER

Erosion of natural deposits

 

FE

Human and animal waste

 

FL

Water additive that promotes strong teeth; discharge from fertilizer and aluminum

 

 

factories

 

FR

Runoff and leaching from fertilizer use; leaching from septic tanks and sewage

 

IC

Internal corrosion of household plumbing systems

IM

Discharge from industrial manufacturers

 

IO

Substances that form ions when in water

 

IW

Industrial waste

 

MD

Discharge from metal-degreasing sites and other factories

 

OC

Runoff from orchards; glass and electronics production waste

 

OD

Discharges of oil-drilling waste and from metal refineries

 

OM

Naturally occurring organic materials

 

PH

Inherent characteristic of water

 

RU

Runoff/leaching from natural deposits

 

SO

Soil runoff

 

SW

Seawater influence

 

VA

Various natural and manmade sources

 

WD

Leaching from wood preservatives

 

UR

Unregulated constituents with no source listed and that do not have standardized

 

 

“source of substance” language

 

Our testing equipment is so sensitive, it can

detect mineral traces as small as 1 part per trillion. That is equivalent to 1 inch in over 15 million miles.

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2020 Water Quality

Primary Drinking Water Standards

 

Year

 

 

PHG

In

 

Distribution System-Wide

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Microbiological

Tested

Unit

MCL

(MCLG)

Compliance

 

Highest Monthly

 

Source

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Total coliform

2020

Positive

5%

(0)

Yes

 

0.57%

 

 

EN

 

 

 

samples

 

 

 

 

 

 

 

 

 

 

Fecal coliform and E. coli

2020

Positive

11

(0)

Yes

 

0

 

 

FE

 

 

 

samples

 

 

 

 

 

 

 

 

 

 

 

Year

 

 

PHG

In

Groundwater

 

SEWD Water2

 

 

Radiological

Tested

Unit

MCL

(MCLG)

Compliance

Range

Average

 

Range

Average

Source

 

 

 

 

 

 

 

 

 

 

 

 

 

Gross alpha particle activity

2015–2020

pCi/L

15

(0)

Yes

ND–8.8

ND

 

ND

ND

ER

 

 

Uranium

2015–2020

pCi/L

20

0.43 (0)

Yes

ND–5.7

1.6

 

n/a

n/a

ER

 

 

Year

 

 

PHG

In

Groundwater

 

SEWD Water

 

 

 

 

 

 

 

 

 

 

 

 

Inorganic Chemicals

Tested

Unit

MCL

(MCLG)

Compliance

Range

Average

 

Range

Average

Source

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Arsenic3

2013–2020

ppb

10

0.004 (0)

Yes

2.3–7.1

4.6

 

ND

ND

ER, OC

 

Barium

2018–2020

ppm

1

2 (2)

Yes

ND–0.19

0.11

 

ND

ND

ER, OD

 

Fluoride

2012–2020

ppm

2

1 (4.0)

Yes

ND–0.11

ND

 

ND

ND

ER, FL

 

Nitrate as N4

2020

ppm

10

10 (10)

Yes

ND–7.2

1.6

 

ND

ND

ER, FR

 

1 This means one total coliform-positive routine sample and one repeat sample, with one of these also being E. coli-positive. 2 A part of Stockton’s water supply is purchased from Stockton East Water District (SEWD).

3 While your drinking water meets the federal and state standards for arsenic, it does contain low levels of arsenic. The arsenic standards balance the current understanding of arsenic’s possible health effects against the costs of removing arsenic from drinking water. The EPA continues to research the health effects of low levels of arsenic, which is a mineral known to cause cancer in humans at high concentrations and is linked to other health effects, such as skin damage and circulatory problems.

4 The average nitrate level in our groundwater was 1.6 ppm, with a maximum level of 7.2 ppm. We are closely monitoring the nitrate levels. Nitrate in drinking water at levels above 10 ppm is a health risk for infants of less than six months of age. Such nitrate levels in drinking water can interfere with the capacity of the infant’s blood to carry oxygen, resulting in a serious illness; symptoms include shortness of breath and blueness of the skin. Nitrate levels above 10 ppm may also affect the ability of the blood to carry oxygen in other individuals, such as pregnant women and those with certain specific enzyme deficiencies. If you are caring for an infant or you are pregnant, you should seek advice from your health care provider.

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2020 Water Quality

(Continued)

 

Year

 

 

PHG

In

 

 

Distribution System-Wide

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

90th Percentile

 

 

 

 

 

Lead and Copper

Tested

Unit

AL

(MCLG)

Compliance

Samples > AL

Source

 

Copper

2018

ppm

1.3

0.3

Yes

 

ND

0 of 56

IC, ER, WD

 

Lead

2018

ppb

15

0.2

Yes

 

ND

0 of 56

IC, IM, ER

 

Schools that requested lead sampling in 2020: 0

 

 

 

 

 

 

 

 

 

 

 

 

 

Year

 

 

PHG

In

Groundwater

SEWD Water

 

 

 

 

 

 

 

 

 

 

 

 

 

Volatile Organic Chemicals

Tested

Unit

MCL

(MCLG)

Compliance

Range

 

Average

Range

 

Average

Source

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Trichloroethylene (TCE)

2012–2020

ppb

5

1.7 (0)

Yes

ND–0.60

 

ND

ND

 

ND

MD

 

 

Year

 

 

PHG

In

 

 

Distribution System-Wide

 

 

 

 

 

 

 

 

 

 

 

 

 

Disinfection Byproducts

Tested

Unit

MCL

(MCLG)

Compliance

Range

Highest Annual Average

Source

 

 

 

 

 

 

 

 

 

 

 

 

Haloacetic acids

2020

ppb

60

n/a

Yes

7.3–16

13

 

DI

 

Total trihalomethanes

2020

ppb

80

n/a

Yes

27–63

44

 

DI

 

 

Year

 

 

 

In

 

 

Distribution System-Wide

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Disinfectants

Tested

Unit

MRDL

MRDLG

Compliance

Range

Average

Source

 

 

 

 

 

 

 

 

 

 

 

 

Free chlorine

2020

ppm

4

4

Yes

ND–1.4

0.68

 

DS

 

 

Year

 

 

PHG

In

 

 

SEWD Water Only

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SEWD Water—Turbidity and TOC

Tested

Unit

MCL

(MCLG)

Compliance

Range

Average

Source

 

 

 

 

 

 

 

 

 

 

 

 

Turbidity1

2020

NTU

TT

n/a

Yes

0.03–0.17

0.04

 

SO

 

 

Year

 

 

PHG

In

 

 

 

Lowest Monthly Percent

 

 

 

Tested

Unit

MCL

(MCLG)

Compliance

Highest Level

Removal Ratio

Source

 

 

 

 

 

 

 

 

 

 

 

 

 

Total organic carbon (TOC)2

2020

ppm

TT

n/a

Yes

 

2.0

1.0

 

VA

 

1 For surface water systems, the treatment technique dictates that the turbidity level of the filtered water be less than or equal to 0.3 NTU in 95% of the measurements taken each month and not exceed 1 NTU at any time. Turbidity is a measurement of the cloudiness of water. We monitor it because it is a good indicator of the effectiveness of our filtration system.

2 TOC has no health effects; however, TOC provides a medium for the formation of disinfection byproducts. These byproducts include trihalomethanes and haloacetic acids. The treatment technique dictates that a removal ratio of 1 or higher must be achieved. Drinking water containing these byproducts in excess of the MCL may lead to adverse health effects such as liver, kidney, or nervous system problems, and may lead to an increased risk of cancer. Concerns regarding disinfection byproducts are based upon exposure over many years.

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TABLE OF CONTENTS WELCOME YOUR WATER 2020 RESULTS MORE INFO

2020 Water Quality

(Continued)

Secondary Drinking Water Standards

 

Year

 

 

PHG

In

Groundwater

SEWD Water

 

 

 

 

 

 

 

 

 

Contaminants

Tested

Unit

SMCL

(MCLG)

Compliance

Range

Average

Range

Average

Source

 

 

 

 

 

 

 

 

 

 

 

Chloride

2012–2020

ppm

500

n/a

Yes

6.9–99

22

3.0

3.0

RU, SW

Specific conductance

2012–2020

US

1600

n/a

Yes

250–640

437

71

71

SW, IO

Iron1

2012–2020

ppb

300

n/a

Yes

ND–240

ND

ND–400

ND

RU, IW

Manganese2

2012–2020

ppb

50

n/a

Yes

ND–50

ND

ND–72

ND

RU

Odor3

2012–2020

T.O.N.

3

n/a

Yes

ND–1.3

ND

1.2–4.0

2.6

OM

Sulfate

2012–2020

ppm

500

n/a

Yes

3.4–34

19

6.8–9.4

7.9

RU, IW

Total dissolved solids

2012–2020

ppm

1000

n/a

Yes

170–400

280

48

48

RU

Turbidity (groundwater)

2012–2020

NTU

5

n/a

Yes

ND–1.8

0.20

n/a

n/a

SO

 

 

 

 

 

 

 

 

 

 

 

1 In one iron sample collected, the value was greater than the SMCL; however, this is in compliance as the average is less than the SMCL. The SMCL was set to protect you against unpleasant aesthetic effects, such as color, taste, odor, and the staining of plumbing fixtures and clothing when washed. Exceeding this SMCL does not pose a health risk.

2 In one manganese sample collected, the value was greater than the SMCL; however, this is in compliance as the average is less than the SMCL. The SMCL was set to protect you against unpleasant aesthetic effects, such as color, taste, odor, and the staining of plumbing fixtures and clothing when washed. Exceeding this SMCL does not pose a health risk.

3 In one odor sample collected, the value was greater than the SMCL; however, this is in compliance as the average is less than the SMCL. The SMCL was set to protect you against unpleasant aesthetic effects, such as color, taste, odor, and the staining of plumbing fixtures and clothing when washed. Exceeding this SMCL does not pose a health risk.

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TABLE OF CONTENTS WELCOME YOUR WATER 2020 RESULTS MORE INFO

2020 Water Quality

(Continued)

State Regulated Contaminants with Notification Levels

 

Year

 

 

PHG

In

Groundwater

SEWD Water

 

 

 

 

 

 

 

 

 

Contaminants

Tested

Unit

NL

(MCLG)

Compliance

Range

Average

Range

Average

Source

 

 

 

 

 

 

 

 

 

 

 

Chromium (hexavalent)1

2014–2020

ppb

n/a

0.02

n/a

ND–8.3

1.6

n/a

n/a

UR

Perfluorooctanesulfonic acid (PFOS)2

2020

ppt

6.5

n/a

Yes

ND–7.0

ND

ND

ND

UR

Vanadium

2017–2020

ppb

50

n/a

Yes

11–41

23

ND

ND

UR

Unregulated Contaminant Monitoring Rule (UCMR)

 

Year

 

 

PHG

In

Groundwater

SEWD Water

 

 

 

 

 

 

 

 

 

Contaminants

Tested

Unit

MCL

(MCLG)

Compliance

Range

Average

Range

Average

Source

 

 

 

 

 

 

 

 

 

 

 

Germanium

2019

ppb

n/a

n/a

n/a

ND–2.5

0.43

ND

ND

UR

 

 

 

 

 

 

 

 

 

 

 

HAA5 (DBAA, DCAA, MBAA, MCAA,

2019

ppb

n/a

n/a

n/a

ND–2.3

ND

n/a

n/a

UR

and TCAA)

 

 

 

 

 

 

 

 

 

 

HAA6Br (BCAA, BDCAA, DBAA,

2019

ppb

n/a

n/a

n/a

ND–4.0

ND

n/a

n/a

UR

CDBAA, MBAA, and TBAA)

 

 

 

 

 

 

 

 

 

 

HAA9 (BCAA, BDCAA, CDBAA,

2019

ppb

n/a

n/a

n/a

9.3–25

17

n/a

n/a

UR

DBAA, DCAA, MBAA, MCAA, TBAA,

 

 

 

 

 

 

 

 

 

 

and TCAA)

 

 

 

 

 

 

 

 

 

 

1 The previous MCL of 0.010 mg/L (10 ppb) for hexavalent chromium was withdrawn on September 11, 2017, and there is currently no MCL in effect. The state recommends that any hexavalent chromium results above the detection limit of 1 ppb still be reported.

2 PFAS include both perfluorooctanic acid (PFOA) and perfluorooctanesulfonic acid (PFOS). There is no MCL or SMCL for PFOS/PFOA; however, there are established NLs and RLs. The NL for PFOA is 5.1 ppt and for PFOS is 6.5 ppt, with RLs of 10 ppt and 40 ppt, respectively. NLs are non-regulatory, health-based advisory levels established for constituents that may be candidates for MCLs in the future. Studies indicate that long-term exposure to PFOS/PFOA over certain levels could have adverse health effects; in laboratory studies, PFOS exposure resulted in immune suppression and cancer, while PFOA exposure resulted in increased liver weight and cancer. Cal Water proactively tested all of our active sources for PFOS and PFOA. We continue to work closely with DDW and EPA to conduct extensive monitoring.

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2020 Water Quality

(Continued)

Unregulated Compounds

 

Year

 

 

PHG

In

Groundwater

SEWD Water

 

 

 

 

 

 

 

 

 

Constituents

Tested

Unit

MCL

(MCLG)

Compliance

Range

Average

Range

Average

Source

 

 

 

 

 

 

 

 

 

 

 

Alkalinity (total)

2012–2020

ppm

n/a

n/a

n/a

110–190

155

27–30

28

UR

Calcium

2018–2020

ppm

n/a

n/a

n/a

10–57

36

5.4–18

6.6

UR

Hardness (total)

2018–2020

ppm

n/a

n/a

n/a

46–199

131

21–72

26

UR

 

 

 

 

 

 

 

 

 

 

 

Potassium

2018–2020

ppm

n/a

n/a

n/a

2.2–7.6

5.2

0.74–1.7

0.92

UR

 

 

 

 

 

 

 

 

 

 

 

Magnesium

2018–2020

ppm

n/a

n/a

n/a

4.9–30

17

1.9–6.7

2.5

UR

 

 

 

 

 

 

 

 

 

 

 

Sodium

2018–2020

ppm

n/a

n/a

n/a

14–41

24

5.6–13

7.3

UR

 

 

 

 

 

 

 

 

 

 

 

pH

2015–2020

STD U

n/a

n/a

n/a

6.7–9.5

7.9

7.7–8.1

7.9

PH

 

 

 

 

 

 

 

 

 

 

 

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Thank you.

Thanks for taking the time to learn more about your water quality! Even more information awaits you at www.calwater.com.

Visit our web site to get information about your account, water-use history, water rates, and water system.

You will also find water-saving tips and news about water conservation programs and rebates available in your area.

> Conservation resources > Lead in water

> Water treatment and disinfection > Protecting the water supply

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Contaminants


California Water Service - Stockton

EWG's drinking water quality report shows results of tests conducted by the water utility and provided to the Environmental Working Group by the California State Water Resources Control Board, as well as information from the U.S. EPA Enforcement and Compliance History database (ECHO). For the latest quarter assessed by the U.S. EPA (January 2019 - March 2019), tap water provided by this water utility was in compliance with federal health-based drinking water standards.

Utility details

  • Serves: 185346
  • Data available: 2012-2017
  • Data Source: Purchased surface water
  • Total: 36

Contaminants That Exceed Guidelines

  • 1%2C2%2C3-Trichloropropane
  • Arsenic
  • Bromodichloromethane
  • Chloroform
  • Chromium (hexavalent)
  • Dibromochloromethane
  • Dichloroacetic acid
  • Nitrate
  • Nitrate and nitrite
  • Total trihalomethanes (TTHMs)
  • Trichloroacetic acid
  • Uranium

Other Detected Contaminants

  • 1%2C2-Dibromo-3-chloropropane (DBCP)
  • 1%2C2-Dichloropropane
  • 1%2C4-Dioxane
  • Aluminum
  • Antimony
  • Barium
  • Beryllium
  • Bromoform
  • Cadmium
  • Chlorate
  • Chromium (total)
  • Dibromoacetic acid
  • Dichlorodifluoromethane
  • Fluoride
  • Haloacetic acids (HAA5)
  • Manganese
  • Molybdenum
  • Selenium
  • Strontium
  • Strontium-90
  • Tetrachloroethylene (perchloroethylene)
  • Thallium
  • Trichloroethylene
  • Vanadium

Reminder

Always take extra precautions, the water may be safe to drink when it leaves the sewage treatment plant but it may pick up pollutants during its way to your tap. We advise that you ask locals or hotel staff about the water quality. Also, note that different cities have different water mineral contents.

Sources and Resources

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