Tap Water Quality Report
Tap water quality in FONTANA, California
Tap water in FONTANA, California receives a grade of D (66/100) from TapWaterSafety.org. It's served by SAN GABRIEL VALLEY WC - FONTANA. The most significant water quality concerns are: Haloacetic acids (HAA5) significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline; Arsenic significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in FONTANA's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving FONTANA.
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.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 17.8 ppb, 297x above the EWG health guideline of 0.06 ppb.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 0.826 ppb, 206x above the EWG health guideline of 0.004 ppb.
EPA compliance record
Official U.S. EPA records for SAN GABRIEL VALLEY WC - FONTANA (system ID CA3610041) for the last 3 years. Checked 2026-10-07.
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for FONTANA
Filters matched to the specific contaminants in FONTANA's water supply.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Reverse osmosis certified for arsenic (NSF/ANSI 58)
$429-$599Reverse osmosis certified under NSF/ANSI 58 for arsenic is the most reliable home option.
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 FONTANA'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 |
|---|---|---|---|---|---|---|---|---|
| Haloacetic acids (HAA5) Disinfection byproduct |
36.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 362× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
17.8 ppb | 0.06 | — | — | — | — | — | 297× over |
| Arsenic Heavy metal |
0.826 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 206× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
20.8 ppb | 0.15 | 80.0 | 100 | — | — | — | 139× over |
| Bromodichloromethane Disinfection byproduct |
5.19 ppb | 0.06 | — | — | — | — | — | 87× over |
| Dibromoacetic acid Disinfection byproduct |
2.39 ppb | 0.03 | — | — | — | — | — | 80× over |
| Dibromochloromethane Disinfection byproduct |
7.69 ppb | 0.1 | — | — | — | — | — | 77× over |
| Chromium (hexavalent) Heavy metal |
1.26 ppb | 0.02 | — | — | — | — | — | 63× over |
| Nitrate Inorganic |
4.36 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 31× over |
| Nitrate and nitrite Inorganic |
2.31 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 16× over |
| Trichloroacetic acid Disinfection byproduct |
0.981 ppb | 0.1 | — | — | — | — | — | 9.8× over |
| Chloroform Disinfection byproduct |
3.67 ppb | 0.4 | — | — | — | — | — | 9.2× over |
| Bromoform Disinfection byproduct |
4.21 ppb | 0.5 | — | — | — | — | — | 8.4× over |
| Dichloroacetic acid Disinfection byproduct |
1.62 ppb | 0.2 | — | — | — | — | — | 8.1× over |
| Uranium Radiological |
2.14 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 5.0× over |
| Perchlorate Disinfection byproduct |
0.752 ppb | 1.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
7.52 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
60.4 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
3.69 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Tetrachloroethylene (perchloroethylene) Volatile organic compound |
0.00466 ppb | 0.06 | 5.0 | — | — | — | — | Below guideline |
| Manganese Heavy metal |
3.03 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Aluminum Heavy metal |
6.05 ppb | 600.0 | — | 200 | — | 600 | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.118 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.286 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| 1-Butanol Other |
0.321 ppb | — | — | — | — | — | — | Below guideline |
| Chromium (total) Heavy metal |
0.795 ppb | — | 100.0 | — | — | — | — | Below guideline |
| Dichlorodifluoromethane Other |
0.0121 ppb | — | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.198 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 SAN GABRIEL VALLEY WC - FONTANA.