Water Quality Report · Updated October 07, 2026
SAN GABRIEL VALLEY WC - FONTANA
SAN GABRIEL VALLEY WC - FONTANA delivers tap water graded C (66/100) by TapWaterSafety.org. The utility serves approximately 237,700 residents in FONTANA, California using surface water. 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. For questions, the utility can be reached at 909-201-7330.
Is FONTANA tap water safe to drink?
SAN GABRIEL VALLEY WC - FONTANA delivers tap water that earns a grade of C (66/100) from TapWaterSafety.org — an average rating, with several contaminants above health guidelines but generally compliant with US legal limits.
The utility serves 237,700 residents in FONTANA, drawing from surface water.
Public testing data identifies 15 contaminants in this water above EWG's health-based guidelines, including: Haloacetic acids (HAA5), Haloacetic acids (HAA9), Arsenic, Total trihalomethanes (TTHMs), Bromodichloromethane, Dibromoacetic acid, Dibromochloromethane, Chromium (hexavalent), Nitrate, Nitrate and nitrite, Trichloroacetic acid, Chloroform, Bromoform, Dichloroacetic acid, Uranium. For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
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.
Quick actions for FONTANA residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for SAN GABRIEL VALLEY WC - 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.
Contact SAN GABRIEL VALLEY WC - FONTANA
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for FONTANA
Filters matched to the specific contaminants in this 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.
Score breakdown
This utility's overall score of 66/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). 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 (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
SAN GABRIEL VALLEY WC - FONTANA service area
This water system serves 1 community in San Bernardino County, California. Click any city for its dedicated tap water quality page.
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