Tap Water Quality Report
Tap water quality in POMONA, California
Tap water in POMONA, California receives a grade of F (53/100) from TapWaterSafety.org. It's served by POMONA - CITY, WATER DEPT.. The most significant water quality concerns are: PFAS contamination; Perfluorohexane sulfonate (PFHXS) significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline; Arsenic detected. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in POMONA's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving POMONA.
PFAS contamination
Severe concernPerfluorooctane sulfonate (PFOS), Perfluorooctanoic acid (PFOA) detected. PFAS are persistent chemicals linked to cancer and immune effects with no known safe exposure threshold.
Perfluorohexane sulfonate (PFHXS) significantly above health guideline
Moderate concernPerfluorohexane sulfonate (PFHXS) detected at 0.38 ppt, 380x above the EWG health guideline of 0.001 ppt.
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 13.9 ppb, 232x above the EWG health guideline of 0.06 ppb.
Arsenic detected
Moderate concernArsenic detected at 0.259 ppb.
EPA compliance record
Official U.S. EPA records for POMONA - CITY, WATER DEPT. (system ID CA1910126) 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 POMONA
Filters matched to the specific contaminants in POMONA's water supply.
Filter certified for PFOA/PFOS (NSF/ANSI 53 or 58)
$180-$750Reverse osmosis and some carbon block filters reduce PFAS. Look for certification to NSF/ANSI 53 or 58 for PFOA/PFOS.
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 POMONA'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 |
|---|---|---|---|---|---|---|---|---|
| Perfluorohexane sulfonate (PFHXS) PFAS |
0.38 ppt | 0.001 | 10.0 | — | — | — | — | 380× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
36.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 362× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
13.9 ppb | 0.06 | — | — | — | — | — | 232× over |
| Chromium (hexavalent) Heavy metal |
4.25 ppb | 0.02 | — | — | — | — | — | 212× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
21.3 ppb | 0.15 | 80.0 | 100 | — | — | — | 142× over |
| Bromodichloromethane Disinfection byproduct |
5.6 ppb | 0.06 | — | — | — | — | — | 93× over |
| Dibromochloromethane Disinfection byproduct |
6.58 ppb | 0.1 | — | — | — | — | — | 66× over |
| Arsenic Heavy metal |
0.259 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 65× over |
| Dibromoacetic acid Disinfection byproduct |
0.725 ppb | 0.03 | — | — | — | — | — | 24× over |
| Nitrate Inorganic |
3.16 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 23× over |
| Trichloroacetic acid Disinfection byproduct |
1.83 ppb | 0.1 | — | — | — | — | — | 18× over |
| Chloroform Disinfection byproduct |
5.81 ppb | 0.4 | — | — | — | — | — | 15× over |
| Tetrachloroethylene (perchloroethylene) Volatile organic compound |
0.488 ppb | 0.06 | 5.0 | — | — | — | — | 8.1× over |
| Dichloroacetic acid Disinfection byproduct |
1.48 ppb | 0.2 | — | — | — | — | — | 7.4× over |
| Bromoform Disinfection byproduct |
3.26 ppb | 0.5 | — | — | — | — | — | 6.5× over |
| Uranium Radiological |
2.18 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 5.1× over |
| Perfluorooctanoic acid (PFOA) PFAS |
0.315 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 3.5× over |
| Perfluorooctane sulfonate (PFOS) PFAS |
0.707 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | 2.4× over |
| Trichloroethylene Volatile organic compound |
0.447 ppb | 0.4 | 5.0 | 10 | 20 | 1.7 | — | 1.1× over |
| Chlorate Disinfection byproduct |
176.1 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Perchlorate Disinfection byproduct |
0.808 ppb | 1.0 | — | — | — | — | — | Below guideline |
| 6:2 Fluorotelomer Sulfonic Acid (6:2 FTSA) Other |
0.718 ppt | 1.0 | — | — | — | — | — | Below guideline |
| 1,4-Dioxane Semi-volatile organic compound |
0.196 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Vanadium Other |
3.5 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Aluminum Heavy metal |
68.6 ppb | 600.0 | — | 200 | — | 600 | — | Below guideline |
| Molybdenum Other |
2.16 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
23.0 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Dichloromethane (methylene chloride) Volatile organic compound |
0.0454 ppb | 4.0 | 5.0 | — | — | — | — | Below guideline |
| Manganese Heavy metal |
0.15 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
0.632 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| 1,1-Dichloroethane Volatile organic compound |
0.00117 ppb | 3.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.491 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
0.234 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
0.151 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| 1,1-Dichloroethylene Volatile organic compound |
0.319 ppb | — | 7.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.276 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Lithium Other |
0.31 ppb | — | — | — | — | — | — | 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 POMONA - CITY, WATER DEPT..