Water Quality Report · Updated October 07, 2026
POMONA - CITY, WATER DEPT.
POMONA - CITY, WATER DEPT. delivers tap water graded F (53/100) by TapWaterSafety.org. The utility serves approximately 151,713 residents in POMONA, California using surface water. 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. For questions, the utility can be reached at 909-620-2248.
Is POMONA tap water safe to drink?
POMONA - CITY, WATER DEPT. delivers tap water that earns a grade of F (53/100) from TapWaterSafety.org — a poor rating, with significant contamination concerns and/or recent violations.
The utility serves 151,713 residents in POMONA, drawing from surface water.
Public testing data identifies 19 contaminants in this water above EWG's health-based guidelines, including: Perfluorohexane sulfonate (PFHXS), Haloacetic acids (HAA5), Haloacetic acids (HAA9), Chromium (hexavalent), Total trihalomethanes (TTHMs), Bromodichloromethane, Dibromochloromethane, Arsenic, Dibromoacetic acid, Nitrate, Trichloroacetic acid, Chloroform, Tetrachloroethylene (perchloroethylene), Dichloroacetic acid, Bromoform, Uranium, Perfluorooctanoic acid (PFOA), Perfluorooctane sulfonate (PFOS), Trichloroethylene. 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 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.
Quick actions for POMONA residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for POMONA - CITY, WATER DEPT..
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.
Contact POMONA - CITY, WATER DEPT.
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 POMONA
Filters matched to the specific contaminants in this 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.
Score breakdown
This utility's overall score of 53/100 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 |
|---|---|---|---|---|---|---|---|---|
| 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 (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
POMONA - CITY, WATER DEPT. service area
This water system serves 1 community in Los Angeles County, California. Click any city for its dedicated tap water quality page.
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