Table of Contents
Can You Drink Tap Water in Mount Pleasant?
Yes, Mount Pleasant's tap water is generally considered safe to drink as Mount Pleasant 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. To find more recent info we might have, you can check out our boil water notice page, the city's water provider website, or Mount Pleasant's local Twitter account.
According the EPA’s ECHO database, from April 30, 2019 to June 30, 2022, Mount Pleasant's water utility, Mt Pleasant Water Works (1010002), had 1 non-health-based 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 Mt Pleasant Water Works (1010002) 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 Mount Pleasant Tap Water
The most recent publicly available numbers for measured contaminant levels in Mount Pleasant 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 Mount Pleasant's water quality reports, or getting your home's tap water tested to see if you should be filtering your water.
Mount Pleasant Tap Water Safe Drinking Water Act Violation History - Prior 10 Years
Below is a ten year history of violations for the water system named Mt Pleasant Water Works (1010002) for Mount Pleasant in South Carolina. For more details please see the "What do these Violations Mean?" section below.
For the compliance period beginning June 18, 2020, Mount Pleasant had 1 non-health based Safe Drinking Water Act violation with the violation category being Monitoring and Reporting, more specifically, the violation code was Monitoring, Source Water (GWR) which falls into the Microbials rule code group, and the Groundwater Rule rule code family for the following contaminant code: E. COLI.
Is there Lead in Mount Pleasant Water?
Based on the EPA’s ECHO Database, 90% of the samples taken from the Mount Pleasant water system, Mt Pleasant Water Works (1010002), between sample start date and sample end date, were at or below, 0.00066 mg/L of lead in Mount Pleasant water. This is 4.4% of the 0.015 mg/L action level. This means 10% of the samples taken from Mount Pleasant contained more lead.
While Mount Pleasant water testing may have found 0.00066 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 Mount Pleasant 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 - Charleston NSY - near Mount Pleasant 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 Mount Pleasant 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.
Mount Pleasant SDWA Violation History Table - Prior 10 Years
| Compliance Period | Status | Health-Based? | Category Code | Code | Rule Code | Contaminant Code | Rule Group Code | Rule Family Code |
|---|---|---|---|---|---|---|---|---|
| 06/18/2020 - | Resolved | No | Monitoring and Reporting (MR) | Monitoring, Source Water (GWR) (34) | Ground Water Rule (140) | E. COLI (3014) | Microbials (100) | Groundwater Rule (140) |
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
- Maximum contaminant levels (MCLs) - maximum allowed contaminant level was exceeded.
- Maximum residual disinfectant levels (MRDLs) - maximum allowed disinfectant level was exceeded.
- Other violations (Other) - the exact required process to reduce the amounts of contaminants in drinking water was not followed.
Non-Health Based Violations
- 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.
- 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.
- 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.
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| Health-Based? | Whether the violation is health based. |
| Category Code |
The category of violation that is reported.
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| 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.
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| Rule Group Code |
Code that uniquely identifies a rule group.
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| Rule Family Code |
Code for rule family.
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For more clarification please visit the EPA's data dictionary.
Mount Pleasant Water - Frequently Asked Questions
| By Mail: | PO BOX 330 MT PLEASANT, SC, 29465 |
Existing customers can login to their Mt Pleasant Water Works (1010002) account to pay their Mount Pleasant water bill by clicking here.
If you want to pay your Mt Pleasant Water Works (1010002) 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 Mount Pleasant water bill.
If you don't want to make an account, or can't remember your account, you can make a one-time payment towards your Mount Pleasant 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.
Moving to a new house or apartment in Mount Pleasant means you will often need to put the water in your name with Mt Pleasant Water Works (1010002). 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.
Leaving your house or apartment in Mount Pleasant means you will likely need to take your name off of the water bill with Mt Pleasant Water Works (1010002). 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.
USER SUBMITTED RATINGS
- Drinking Water Pollution and Inaccessibility
- Water Pollution
- Drinking Water Quality and Accessibility
- Water Quality
The above data is comprised of subjective, user submitted opinions about the water quality and pollution in Mount Pleasant, measured on a scale from 0% (lowest) to 100% (highest).
Related FAQS
Mount Pleasant 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 Mount Pleasant's Water. If you would like to see the original version of the report, please click here.
ANNUAL DRINKING WATER QUALITY REPORT
2020
This Annual Drinking Water Quality Report provides information on the quality of your drinking water. The United States Environmental Protection Agency (EPA) requires all drinking water suppliers to provide their customers with a water quality report on an annual basis. This report contains important information on the source of your water, what it contains, and how it compares to standards set by regulatory agencies.
Dear Waterworks Customers,
2020 was a year of reflection on the past and anticipation for the future of Mount Pleasant Waterworks (MPW). After 32 years of waking up each day to lead a team of passionate public servants, I announced my retirement, and the Commissioners launched a national search for the utility’s next general manager.
Allan Clum, our current operations manager, was unanimously selected to take the reins of the organization starting July 1, 2021. A
MPW is committed to providing you with a safe, clean, and reliable water supply. It has been the priority of the utility under my leadership and will remain our top priority. Based on the water quality monitoring data collected in 2020, MPW’s drinking water surpassed all state and federal drinking water health standards. These standards for treating, providing, and monitoring drinking water ensure that
Left to right: Clay Duffie and Allan Clum
our customers always have safe, clean water at their fingertips.
Thank you for your continued support of the men and women at MPW who strive to provide our community with clean water every day.
Sincerely,
Clay Duffie,
General Manager
Where does my water come from?
Your water comes from the Charleston Aquifer, a pristine groundwater source estimated to be more than 50,000 years old. Six wells are drilled to an average of 2,000 feet below the earth’s surface and groundwater is pumped to four Reverse Osmosis (RO) treatment plants and disinfected with chloramines. To supplement water demand, additional water is purchased under a wholesale contract with Charleston Water System. This supplemental drinking water is sourced from the Bushy Park Reservoir and the Edisto River. The surface water is treated by conventional water treatment and disinfected with chloramines. You can find more details on the surface water source at
LEGEND
Water Treatment Plant
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King St. near the corner of Simmons St. (Old Village) |
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7th Ave. near the corner of Mathis Ferry Rd. |
Plant 3 |
Labor Camp Rd. off Venning Rd. |
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CHARLESTON
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ATLANTIC
OCEAN
MPW Service Area
Mount Pleasant Waterworks serves more than 90,000 people in the vibrant and thriving Mount Pleasant community. The MPW treatment and distribution system is comprised of approximately 550 miles of conveyance pipe, four RO water treatment plants, six deep wells, eight ground storage tanks, one operational elevated tank, three aquifer storage and recovery (ASR) wells, and two wholesale water intakes.
www.mountpleasantwaterworks.com
2020 Annual Drinking Water Quality Report 1
DRINKING WATER ANALYSIS DATA FOR 2020
Regulated and Unregulated Water Quality Monitoring
MPW routinely monitors for constituents in your drinking water according to federal and state laws. Monitoring results for the period of January 1 to December 31, 2020, unless otherwise noted, are included in the following tables. The state allows MPW to monitor for some constituents less than once per year because the concentrations are not expected to vary significantly from year to year, or the system is not considered vulnerable to the constituent. Therefore, some of our data, though representative, may be more than one year old.
MPW’S WATER QUALITY
Constituents
MCLG or
MRDLG
MCL, TT, or MRDL
Highest Level Detected
In Your Water
Range
Low |
High |
Sample
Date
Violation Typical Source
Disinfectants & Disinfection
(There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants)
Chloramine (as Cl2) (mg/L) |
4 |
4 |
3 |
2 |
3 |
2020 |
No |
Water additive used to control microbes |
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Haloacetic Acids (HAA5) (ppb) |
NA |
60 |
20.25 |
ND |
20.25 |
2020 |
No |
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TTHMs [Total Trihalomethanes] (ppb) |
NA |
80 |
15.48 |
ND |
15.48 |
2020 |
No |
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Inorganic Constituents
Fluoride (ppm) |
4 |
4 |
0.54 |
0.14 |
0.54 |
No |
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Sodium (ppm) |
MNR |
NA |
Average = 46 |
24 |
69 |
No |
Erosion of natural deposits
Microbiological Constituents
Total Coliform (RTCR)
NA
TT
2.0 % positive samples. All repeats were negative
0%
2.0%
2020
No
Naturally present in the environment
Radioactive Constituents
Alpha emitters (pCi/L)
0
15
2.96
ND
2.96
2019
No
Erosion of natural deposits
2019 Unregulated Contaminant Monitoring (UCMR4)
Range
Name |
Reported Level |
Low |
High |
Sample Date |
HAA6Br (ug/L)
HAA9 (ug/L)
Manganese (ug/L)
3.99 |
ND |
3.99 |
2019 |
10.31 |
0.318 |
18.5 |
2019 |
6.41 |
0.678 |
10.4 |
2019 |
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EPA uses the Unregulated Contaminant Monitoring Rule (UCMR) to collect data for contaminants that are suspected to be present in drinking water and do not have
PURCHASED SURFACE WATER QUALITY
Constituents
MCLG or |
MCL, TT, |
MRDLG |
or MRDL |
Highest Level
Detected In
Your Water
Range
Low |
High |
Sample
Date
Violation Typical Source
Disinfectants & Disinfection
(There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants)
Chloramine (as Cl2) (mg/L)
4
4
3
2
3
2020
No
Water additive used to control microbes
Inorganic Constituents
Fluoride (ppm) |
4 |
4 |
0.67 |
0.45 |
0.67 |
2020 |
No |
Erosion of natural deposits; Water additive which promotes |
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Nitrate [measured as Nitrogen] (ppm) |
10 |
10 |
0.18 |
NA |
NA |
2020 |
No |
Runoff from fertilizer use; Leaching from septic tanks, sewage; |
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Erosion of natural deposits |
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Total Organic Carbon |
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Total Organic Carbon (% Removal)
Required removal=
TT
Average %
Removal =61.4%
57%
65%
2020
No
Naturally present in the environment
Turbidity
Turbidity (NTU)
NA
0.3
0.12
NA
NA
2020
No
Soil runoff
100% of the samples were below the TT value of .3. A value less than 95% constitutes a TT violation. The highest single measurement was .12. Any measurement in excess of 1 is a violation unless otherwise approved by the state.
2020 Unregulated Contaminant Monitoring (UCMR4)
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Reported Level |
Low |
High |
Sample Date |
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Manganese (ppb) |
9.38 |
6.15 |
14.4 |
2020 |
EPA uses the Unregulated Contaminant Monitoring Rule (UCMR) to |
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Bromide (ppm) |
0.04 |
0.03 |
0.04 |
2020 |
collect data for contaminants that are suspected to be present in |
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drinking water and do not have |
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Total Organic Carbon (TOC) (ppm) |
7.45 |
6.46 |
7.98 |
2020 |
Safe Drinking Water Act (SDWA). |
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2 |
2020 Annual Drinking Water Quality Report |
www.mountpleasantwaterworks.com |
LEAD IN DRINKING WATER
MPW is committed to delivering safe water to our customers. The water we provide to homes and businesses is
is responsible for providing high quality drinking water but cannot control the materials used in
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, we provide complementary testing. Information on lead in drinking water, testing methods, and steps you can take to minimize exposure is available from the Safe Drinking Water Hotline or at www.epa.gov/safewater/lead. For a complementary lead test please contact our customer service line at
LEAD & COPPER WATER QUALITY MONITORING
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Your Water |
Sample |
# Samples |
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Constituent |
MCLG |
AL |
(90th percentile) |
Date |
Exceeding AL |
Exceeds AL |
Typical Source |
Copper - action level at consumer taps (ppm) |
1.3 |
1.3 |
0.07 |
2020 |
0 |
No |
Corrosion of household plumbing |
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Lead - action level at consumer taps (ppb) |
0 |
15 |
0.66 |
2020 |
0 |
No |
systems; Erosion of natural deposits |
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Voluntary Water Quality Monitoring
EMERGING CONSTITUENTS PFOS/PFOA
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Highest Level |
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EPA Lifetime |
Detected in |
Constituent |
Health Advisory |
Your Water |
Gen X (ppt) |
NA |
0 |
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Perfluorobutanesulfonic acid (PFBS) (ppt) |
NA |
2.5 |
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Perfluoroheptanoic acid (PFHpA) (ppt) |
NA |
2.1 |
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Perfluorohexanesulfonic acid (PFHxS) (ppt) |
NA |
0 |
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Perfluorononanoic acid (PFNA) (ppt) |
NA |
0 |
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Perfluorohexanoic acid (PFHxA) (ppt) |
NA |
3.6 |
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Perfluorooctanesulfonic acid (PFOS) (ppt) |
70 |
5.7 |
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Perfluorooctanoic acid (PFOA) (ppt) |
70 |
3.0 |
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GENERAL INTEREST WATER QUALITY
Constituent |
Average in Your Water |
EPA Secondary MCL |
Chloride (ppm) |
39 |
250 |
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Sodium (ppm) |
63 |
NA |
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Alkalinity (ppm) |
110 |
NA |
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Hardness (ppm) |
48 |
NA |
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pH (S.U.) |
8.27 |
NA |
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For more information please contact:
MPW Laboratory at
GROUNDWATER RULE TRIGGERED MONITORING VIOLATION
MPW is required to monitor your drinking water for specific contaminants on a routine basis. Results of routine monitoring are an indicator of whether our drinking water meets health standards. In June 2020, we inadvertently omitted one sample for groundwater source monitoring which resulted
in a violation of South Carolina’s groundwater rule. Upon notification, we immediately took the required samples. MPW routinely monitors water quality 24/7 and our records indicate
water quality was not compromised because of the missed sample. Additional samples were taken from this location to confirm our commitment to
There were no impacts to public health or safety, and this does not require you to act. For more information, please contact Laboratory Director Jestine Deepe at
www.mountpleasantwaterworks.com |
2020 Annual Drinking Water Quality Report |
3 |
How are Sources of
Water Impacted?
The sources for drinking water, both tap and bottled water, 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 can pick up substances resulting from the presence of animals or from human activity:
Microbial Constituents
such as viruses and bacteria, that may come from sewage treatment plants, septic systems, agricultural livestock operations, and wildlife.
Inorganic Constituents
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 Constituents including synthetic and volatile organic chemicals, which are by- products of industrial processes and petroleum production, and can also come from gas stations, urban stormwater runoff, and septic systems.
Radioactive Constituents which can be naturally occurring or be the result of oil and gas production and mining activities.
For more information about contaminants and potential health effects call the Environmental Protection Agency’s Safe Drinking Water Hotline at
ABBREVIATIONS & DEFINITIONS
ug/L: Number of micrograms of substance in one liter of water
ppm: parts per million, or milligrams per liter (mg/L)
ppb: parts per billion, or micrograms per liter (µg/L)
ppt: parts per trillion, or nanograms per liter (ng/L)
mg/L: Number of milligrams of substance in one liter of water
pCi/L: picocuries per liter (a measure of radioactivity)
- positive samples/month: Percent of samples taken monthly that were positive
- removal: Amount of constituent removed in percent
NA: Not Applicable
ND: Not Detected
MNR: Monitoring Not Required, but recommended.
NTU: Nephelometric Turbidity Unit
S.U.: Standard Unit of measurement
MCLG: Maximum Contaminant Level Goal: The level of a contaminant in drinking water below which there is no known or expected risk to health. MCLGs allow for a margin of safety.
MCL: Maximum Contaminant Level: The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as feasible using the best available treatment technology.
- Treatment Technique: A required process intended to reduce the level of a contaminant in drinking water.
AL: Action Level: The concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must follow.
MRDLG: Maximum Residual Disinfection Level Goal: The level of a drinking water disinfectant below which there is no known or expected risk to health. MRDLGs do not reflect the benefits of the use of disinfectants to control microbial contaminants.
MRDL: Maximum Residual Disinfectant Level: 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.
RTCR: Revised Total Coliform Rule
4 |
2020 Annual Drinking Water Quality Report |
www.mountpleasantwaterworks.com |
BUILDING A THIRD WATER CONNECTION
BENEATH THE INTRACOASTAL
EPA SPECIAL NOTICE FOR
Some people may be more vulnerable to contaminants in drinking water than the general population. Immunocompromised people, such as people with cancer undergoing chemotherapy, people who have undergone organ transplants, people with HIV/AIDS or other immune system disorders, some elderly and infants, can be particularly at risk of infections. These people should seek advice about drinking water from their health care providers. Guidelines from the EPA and the Centers for Disease Control and Prevention on appropriate means to lessen the risk of infection by cryptosporidium and other microbial contaminants are available from the Safe Drinking Water Hotline,
How is MPW’s
Groundwater Treated?
Withdraw from the Charleston
Aquifer (2000 ft below the
Earth’s surface)
Prefilter1.0 micron to remove dirt, sand, rust, grit, and other suspended matter from water.
Reverse Osmosis Membranes
A partially permeable membrane which removes pathogens, bacteria, ions, unwanted molecules and larger particles from drinking water.
Corrosion Control
Calcium Chloride is added to adjust pH for optimum corrosion control and protect water pipes from leaching heavy metals.
Raw Water Blend
10% of our groundwater source is blended with Reverse Osmosis treated water to naturally add fluoride and other beneficial minerals.
Disinfection
Chlorine (sodium hypochlorite) and ammonia gas is added to the water to kill potential harmful organisms before the water leaves the plant. Chloramine maintains the disinfection in the water system.
www.mountpleasantwaterworks.com |
2020 Annual Drinking Water Quality Report |
5 |
ESSENTIAL WORKERS
WE ALL HAVE SOMETHING AT STAKE WHEN IT COMES TO CLEAN WATER.
Our team of water experts provides you with clean, safe, drinking water, 24/7, 365
Our continued commitment to our customers and each other is why we continue to be one of the Best Places to Work in South Carolina.
Commission Meetings
3rd Monday of the month 5:00 PM
1619 Rifle Range Road, Mount Pleasant, SC 29464
Contaminants
Mt Pleasant Water Works
EWG's drinking water quality report shows results of tests conducted by the water utility and provided to the Environmental Working Group by the South Carolina Department of Health & Environmental Control, 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: 82125
- Data available: 2012-2017
- Data Source: Purchased surface water
- Total: 19
Contaminants That Exceed Guidelines
- Bromodichloromethane
- Chloroform
- Dibromochloromethane
- Dichloroacetic acid
- Total trihalomethanes (TTHMs)
- Trichloroacetic acid
Other Detected Contaminants
- 1%2C4-Dioxane
- Bromoform
- Chlorate
- Chromium (hexavalent)
- Chromium (total)
- Dibromoacetic acid
- Fluoride
- Haloacetic acids (HAA5)
- Monobromoacetic acid
- Nitrate
- Nitrate and nitrite
- Strontium
- 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.