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Can You Drink Tap Water in Diamond Bar?
Yes, Diamond Bar's tap water is generally considered safe to drink as Diamond Bar 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 or the city's water provider website.
According the EPA’s ECHO database, from April 30, 2019 to June 30, 2022, Diamond Bar's water utility, Calif State Polytechnical Univ - Pomona, had 0 violations of the Safe Drinking Water Act. For more details on the violations, please see our violation history section below. The last violation for Diamond Bar was resolved on March 31, 2017. This assessment is based on the Calif State Polytechnical Univ - Pomona 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.
Diamond Bar Tap Water Safe Drinking Water Act Violation History - Prior 10 Years
Below is a ten year history of violations for the water system named Calif State Polytechnical Univ - Pomona for Diamond Bar in California. For more details please see the "What do these Violations Mean?" section below.
From Jan. 1, 2017 to March 31, 2017, Diamond Bar had 1 health-based Safe Drinking Water Act violation with the violation category being Maximum Contaminant Level Violation, more specifically, the violation code was Maximum Contaminant Level Violation, Average which falls into the Disinfectants and Disinfection Byproducts Rule rule code group, and the Stage 2 Disinfectants and Disinfection Byproducts Rule rule code family for the following contaminant code: TTHM.
Is there Lead in Diamond Bar Water?
Based on the EPA’s ECHO Database, 90% of the samples taken from the Diamond Bar water system, Calif State Polytechnical Univ - Pomona, between sample start date and sample end date, were at or below, 0.0 mg/L of lead in Diamond Bar water. This is 0% of the 0.015 mg/L action level. This means 10% of the samples taken from Diamond Bar contained more lead.
While Diamond Bar 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 Diamond Bar 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 - AZUSA CA NCCOSC MORRIS DA - near Diamond Bar 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 Diamond Bar 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.
Diamond Bar 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|
|01/01/2017 - 03/31/2017||Resolved||Yes||Maximum Contaminant Level Violation (MCL)||Maximum Contaminant Level Violation, Average (02)||Stage 2 Disinfectants and Disinfection Byproducts Rule (220)||TTHM (2950)||Disinfectants and Disinfection Byproducts Rule (200)||Stage 2 Disinfectants and Disinfection Byproducts Rule (220)|
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
|Compliance Period||Dates of the compliance period.|
Current status of the violation.
|Health-Based?||Whether the violation is health based.|
The category of violation that is reported.
|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.|
Code for a National Drinking Water rule.
|Rule Group Code||
Code that uniquely identifies a rule group.
|Rule Family Code||
Code for rule family.
For more clarification please visit the EPA's data dictionary.
Diamond Bar Water - Frequently Asked Questions
|By Mail:||3801 WEST TEMPLE AVENUE
FACILITIES MANAGEMENT BUILDING 81
POMONA, CA, 91768
Existing customers can login to their Calif State Polytechnical Univ - Pomona account to pay their Diamond Bar water bill by clicking here.
If you want to pay your Calif State Polytechnical Univ - Pomona 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 Diamond Bar 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 Diamond Bar 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 Diamond Bar means you will often need to put the water in your name with Calif State Polytechnical Univ - Pomona. 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 Diamond Bar means you will likely need to take your name off of the water bill with Calif State Polytechnical Univ - Pomona. 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 30% Low
- Water Pollution 40% Moderate
- Drinking Water Quality and Accessibility 70% High
- Water Quality 60% High
The above data is comprised of subjective, user submitted opinions about the water quality and pollution in Diamond Bar, measured on a scale from 0% (lowest) to 100% (highest).
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.