Tap Water Quality Report
Tap water quality in CERES, California
Tap water in CERES, California receives a grade of F (57/100) from TapWaterSafety.org. It's served by CERES, CITY OF. The most significant water quality concerns are: Arsenic significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Chromium (hexavalent) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in CERES's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving CERES.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 5.08 ppb, 1270x above the EWG health guideline of 0.004 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 36.2 ppb, 362x above the EWG health guideline of 0.1 ppb.
Chromium (hexavalent) significantly above health guideline
Moderate concernChromium (hexavalent) detected at 1.09 ppb, 55x above the EWG health guideline of 0.02 ppb.
Recommended filters for CERES
Filters matched to the specific contaminants in CERES's water supply.
Reverse Osmosis
$249-$750Arsenic is most effectively removed by reverse osmosis. Some specialized adsorptive filters also work.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in CERES's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Arsenic Heavy metal |
5.08 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 1270× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
36.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 362× over |
| Chromium (hexavalent) Heavy metal |
1.09 ppb | 0.02 | — | — | — | — | — | 55× over |
| Nitrate Inorganic |
6.18 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 44× over |
| Tetrachloroethylene (perchloroethylene) Volatile organic compound |
2.29 ppb | 0.06 | 5.0 | — | — | — | — | 38× over |
| Uranium Radiological |
9.84 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 23× over |
| Dibromoacetic acid Disinfection byproduct |
0.556 ppb | 0.03 | — | — | — | — | — | 19× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
0.856 ppb | 0.06 | — | — | — | — | — | 14× over |
| 1,2,3-Trichloropropane Other |
0.00625 ppb | 0.0007 | — | — | — | — | — | 8.9× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
1.33 ppb | 0.15 | 80.0 | 100 | — | — | — | 8.9× over |
| Bromoform Disinfection byproduct |
1.28 ppb | 0.5 | — | — | — | — | — | 2.6× over |
| Dibromochloromethane Disinfection byproduct |
0.124 ppb | 0.1 | — | — | — | — | — | 1.2× over |
| Vanadium Other |
23.5 ppb | 21.0 | — | — | — | — | — | 1.1× over |
| Chlorate Disinfection byproduct |
126.6 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
120.0 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Molybdenum Other |
4.19 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
6.63 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Cobalt Other |
0.25 ppb | 70.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.574 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.011 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from CERES, CITY OF.