All Data Provided by EWG
Zone 7 Water Agency
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: 40
Data available: 2014-2019
Source: Surface water
Contaminants Detected
13 EXCEED EWG HEALTH GUIDELINES
27 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.
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Contaminants Detected
Arsenic
Potential Effect: cancer
4.6x
EWG’S HEALTH GUIDELINE
Bromodichloromethane
Potential Effect: cancer
43x
EWG’S HEALTH GUIDELINE
Bromoform
Potential Effect: cancer
5.1x
EWG’S HEALTH GUIDELINE
Chloroform
Potential Effect: cancer
4.1x
EWG’S HEALTH GUIDELINE
Chromium (hexavalent)
Potential Effect: cancer
545x
EWG’S HEALTH GUIDELINE
Dibromochloromethane
Potential Effect: cancer
38x
EWG’S HEALTH GUIDELINE
Nitrate
Potential Effect: cancer
13x
EWG’S HEALTH GUIDELINE
Perfluorobutane sulfonate (PFBS)
Potential Effect:
4.5x
EWG’S HEALTH GUIDELINE
Perfluorohexane sulfonate (PFHXS)
Potential Effect:
23x
EWG’S HEALTH GUIDELINE
Perfluorooctane sulfonate (PFOS)
Potential Effect:
27x
EWG’S HEALTH GUIDELINE
Perfluorooctanoic acid (PFOA)
Potential Effect: cancer
438x
EWG’S HEALTH GUIDELINE
Total trihalomethanes (TTHMs)†
Potential Effect:
117x
EWG’S HEALTH GUIDELINE
Uranium
Potential Effect: cancer
2x
EWG’S HEALTH GUIDELINE
Other Contaminants Tested
Zone 7 Water Agency compliance with legally mandated federal standards:
- From April 2019 to March 2021, Zone 7 Water Agency complied with health-based drinking water standards.
| Contaminant | Activated Carbon | Reverse Osmosis | Ion Exchange |
| CONTAMINANTS ABOVE HEALTH GUIDELINES | |||
| Arsenic | ✔ | ✔ | |
| Bromodichloromethane | ✔ | ✔ | |
| Bromoform | ✔ | ✔ | |
| Chloroform | ✔ | ✔ | |
| Chromium (hexavalent) | ✔ | ✔ | |
| Dibromochloromethane | ✔ | ✔ | |
| Nitrate | ✔ | ✔ | |
| Perfluorobutane sulfonate (PFBS) | ✔ | ✔ | |
| Perfluorohexane sulfonate (PFHXS) | ✔ | ✔ | |
| Perfluorooctane sulfonate (PFOS) | ✔ | ✔ | |
| Perfluorooctanoic acid (PFOA) | ✔ | ✔ | |
| Total trihalomethanes (TTHMs) | ✔ | ✔ | |
| Uranium, combined (pCi/L) | ✔ | ✔ | |
| OTHER CONTAMINANTS DETECTED | |||
| Aluminum | ✔ | ||
| Barium | ✔ | ✔ | |
| Bromide | ✔ | ✔ | |
| Chlorate | |||
| Chromium (total) | ✔ | ✔ | |
| Fluoride | ✔ | ||
| Manganese | ✔ | ||
| Molybdenum | ✔ | ✔ | |
| N-Nitrosodi-N-butylamine | ✔ | ||
| N-Nitrosodimethylamine (NDMA) | ✔ | ||
| Perfluoroheptanoic acid (PFHPA) | ✔ | ✔ | |
| Perfluorohexanoic Acid (PFHxA) | ✔ | ✔ | |
| Selenium | ✔ | ||
| Vanadium | ✔ |
Take Action
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EWG Drinking Water Standards
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