Tap Water Quality Report
Tap water quality in San Bernardino, California
Tap water in San Bernardino, California receives a grade of F (59/100) from TapWaterSafety.org. It's served by San Bernardino Municipal Water System. The most significant water quality concerns are: Arsenic significantly above health guideline; Chromium-6 detected; Radium-228 detected. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database, and San Bernardino's published Consumer Confidence Report.
What's in San Bernardino's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving San Bernardino.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 1.84 ppb, 460x above the EWG health guideline of 0.004 ppb.
Chromium-6 detected
Moderate concernChromium-6 detected at 0.18 ppb.
Radium-228 detected
Moderate concernRadium-228 detected at 0.13 pCi/L.
Recommended filters for San Bernardino
Filters matched to the specific contaminants in San Bernardino's water supply.
Reverse Osmosis
$249-$750Arsenic is most effectively removed by reverse osmosis. Some specialized adsorptive filters also work.
Reverse Osmosis or water softener
$249-$750RO removes radium effectively; ion-exchange water softeners also reduce radium concentration.
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 San Bernardino'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 |
1.84 ppb | 0.004 | 10 | 10 | 10 | 0.004 | 2023 | 460× over |
| Haloacetic Acids (HAA5) Disinfection byproduct |
2.9 ppb | 0.1 | 60 | 60 | — | — | 2024 | 29× over |
| Total Trihalomethanes (TTHMs) Disinfection byproduct |
9.65 ppb | 0.6 | 80 | 100 | — | — | 2022 | 16× over |
| Chromium-6 (Hexavalent) Heavy metal |
0.225 ppb | 0.02 | — | — | — | 0.02 | 2023 | 11× over |
| Nitrate Inorganic |
0.975 mg/L | 0.14 | 10 | 11.3 | 11.3 | 10 | 2022 | 7.0× over |
| Radium-228 Radiological |
0.13 pCi/L | 0.019 | 5 | — | 0.1 | 0.019 | 2024 | 6.8× over |
| Lead Heavy metal |
0.891 ppb | 0 | 15 | 5 | 10 | 0.2 | 2022 | — |
| Contaminant | Detected (2024) | EWG | EPA | EU DWD | WHO | CA PHG | Status |
|---|---|---|---|---|---|---|---|
| Haloacetic Acids (HAA5) Disinfection byproduct |
2.9 ppb | 0.1 | 60 | 60 | — | — | 29× over |
| Radium-228 Radiological |
0.13 pCi/L | 0.019 | 5 | — | 0.1 | 0.019 | 6.8× over |
| Contaminant | Detected (2023) | EWG | EPA | EU DWD | WHO | CA PHG | Status |
|---|---|---|---|---|---|---|---|
| Arsenic Heavy metal |
1.84 ppb | 0.004 | 10 | 10 | 10 | 0.004 | 460× over |
| Chromium-6 (Hexavalent) Heavy metal |
0.225 ppb | 0.02 | — | — | — | 0.02 | 11× over |
| Contaminant | Detected (2022) | EWG | EPA | EU DWD | WHO | CA PHG | Status |
|---|---|---|---|---|---|---|---|
| Total Trihalomethanes (TTHMs) Disinfection byproduct |
9.65 ppb | 0.6 | 80 | 100 | — | — | 16× over |
| Nitrate Inorganic |
0.975 mg/L | 0.14 | 10 | 11.3 | 11.3 | 10 | 7.0× over |
| Lead Heavy metal |
0.891 ppb | 0 | 15 | 5 | 10 | 0.2 | — |
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 San Bernardino Municipal Water System.
General Contact
Water Quality Contact
For questions about contaminants or test results.