All Data Provided by EWG
San Joaquin
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 2021 – March 2021), tap water provided by this water utility was in compliance with federal health-based drinking water standards.
Utility Details
Serves: 4,060
Data available: 2014-2019
Source: Groundwater
Contaminants Detected
7 EXCEED EWG HEALTH GUIDELINES
9 Total Contaminants
- Legal does not necessarily equal safe. Getting a passing grade from the federal government does not mean the water meets the latest health guidelines.
- Legal limits for contaminants in tap water have not been updated in almost 20 years.
- The best way to ensure clean tap water is to keep pollution out of source water in the first place.
What To Do
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Contaminants Detected
Arsenic
Potential Effect: cancer
931x
EWG’S HEALTH GUIDELINE
Bromoform
Potential Effect: cancer
2.8x
EWG’S HEALTH GUIDELINE
Dibromoacetic acid
Potential Effect:
22x
EWG’S HEALTH GUIDELINE
Dibromochloromethane
Potential Effect: cancer
4.4x
EWG’S HEALTH GUIDELINE
Haloacetic acids (HAA9)†
Potential Effect: cancer
105x
EWG’S HEALTH GUIDELINE
Manganese
Potential Effect: cancer
2.1x
EWG’S HEALTH GUIDELINE
Total trihalomethanes (TTHMs)†
Potential Effect:
27x
EWG’S HEALTH GUIDELINE
Other Contaminants Tested
San Joaquin, City Of compliance with legally mandated federal standards:
- From April 2019 to March 2021, San Joaquin, City Of complied with health-based drinking water standards.
| Contaminant | Activated Carbon | Reverse Osmosis | Ion Exchange |
| CONTAMINANTS ABOVE HEALTH GUIDELINES | |||
| Arsenic | ✔ | ✔ | |
| Bromoform | ✔ | ✔ | |
| Dibromoacetic acid | ✔ | ✔ | |
| Dibromochloromethane | ✔ | ✔ | |
| Haloacetic acids (HAA9) | ✔ | ✔ | |
| Manganese | ✔ | ||
| Total trihalomethanes (TTHMs) | ✔ | ✔ | |
| OTHER CONTAMINANTS DETECTED | |||
| Fluoride | ✔ | ||
| Germanium | ✔ |
Take Action
Contact Your Local Official
One of the best ways to push for cleaner water is to hold accountable the elected officials who have a say in water quality – from city hall and the state legislature to Congress all the way to the Oval Office – by asking questions and demanding answers.
Filter Out Contaminants
Check out our recommendations for filters to protect your water against the detected contaminants.
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EWG Drinking Water Standards
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EWG’S GUIDE TO SAFE DRINKING WATER
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