Compliance record
Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.
10
health-based violations
10
violations on file
0
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| TT | Health-based | Resolved | 1993-06-01 → 1997-06-30 |
| TT | Health-based | Resolved | 1993-06-01 → 1997-06-30 |
| TT | Health-based | Resolved | 1993-06-01 → 1997-06-30 |
| TT | Health-based | Resolved | 1993-06-01 → 1997-06-30 |
| TT | Health-based | Resolved | 1993-06-01 → 1997-06-30 |
| TT | Health-based | Resolved | 1993-06-01 → 1997-06-30 |
| TT | Health-based | Resolved | 1993-06-01 → 1997-06-30 |
| TT | Health-based | Resolved | 1993-06-01 → 1997-06-30 |
| TT | Health-based | Resolved | 1993-06-01 → 1997-06-30 |
| TT | Health-based | Resolved | 1993-06-01 → 1997-06-30 |
PFAS detected
PFAS are industrial “forever chemicals”. These are the EPA's latest
nationwide test results (2023–2025).
Other contaminants detected
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of this
system's samples — over 100% is worth reading, but is not by itself a
violation. Where a single sample came in higher than that percentile, it
is noted under the bar. Formal violations are listed separately.
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Nitrate | 16272 µg/L 163% of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 29000 µg/L | 8710/8972 | SYR4 | 2012–2019 |
| Trichloroethylene | 10 µg/L 200% of the EPA limit, at the 95th percentile of samples — 5 µg/L
worst single sample: 130 µg/L | 1632/2496 | SYR4 | 2012–2019 |
| Tetrachloroethylene | 7.6 µg/L 152% of the EPA limit, at the 95th percentile of samples — 5 µg/L
worst single sample: 34 µg/L | 1188/2496 | SYR4 | 2012–2019 |
| 1,1-Dichloroethylene | 28 µg/L 400% of the EPA limit, at the 95th percentile of samples — 7 µg/L
worst single sample: 61 µg/L | 1160/2471 | SYR4 | 2012–2019 |
| TTHM | 39 µg/L 49% of the EPA limit 80 µg/L
worst single sample: 51 µg/L | 283/314 | SYR4 | 2012–2019 |
| Chloroform | 13 µg/L No EPA limit set
worst single sample: 25 µg/L | 269/314 | SYR4 | 2012–2019 |
| Bromodichloromethane | 12 µg/L No EPA limit set
worst single sample: 14 µg/L | 267/318 | SYR4 | 2012–2019 |
| Dibromochloromethane | 13 µg/L No EPA limit set
worst single sample: 19 µg/L | 250/320 | SYR4 | 2012–2019 |
| Bromoform | 9.425 µg/L No EPA limit set
worst single sample: 17 µg/L | 220/317 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 16.05 µg/L 27% of the EPA limit 60 µg/L
worst single sample: 27 µg/L | 180/247 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 8.365 µg/L No EPA limit set
worst single sample: 16 µg/L | 168/247 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 6.8 µg/L No EPA limit set
worst single sample: 12 µg/L | 154/247 | SYR4 | 2012–2019 |
| Fluoride | 504 µg/L 13% of the EPA limit 4000 µg/L
worst single sample: 600 µg/L | 153/153 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 3.47 µg/L No EPA limit set
worst single sample: 5.8 µg/L | 147/247 | SYR4 | 2012–2019 |
| Chromium | 88 µg/L 88% of the EPA limit 100 µg/L
worst single sample: 180 µg/L | 66/307 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 17000 µg/L 170% of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 22000 µg/L | 61/78 | SYR4 | 2012–2019 |
| Combined Uranium | 6.8724 µg/L 23% of the EPA limit 30 µg/L
worst single sample: 7.003 µg/L | 33/34 | SYR4 | 2012–2019 |
| Lead | 0.0021 mg/L 14% of the EPA limit 0.0150 mg/L | 28/28 | LCR | 2025 |
| Arsenic | 8.365 µg/L 84% of the EPA limit 10 µg/L
worst single sample: 11 µg/L | 18/156 | SYR4 | 2012–2019 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.0882 µg/L 44% of the EPA limit 0.2000 µg/L
worst single sample: 0.1100 µg/L | 16/150 | SYR4 | 2012–2019 |
| Monobromoacetic Acid | 2.175 µg/L No EPA limit set
worst single sample: 2.4 µg/L | 10/247 | SYR4 | 2012–2019 |
| Barium | 100 µg/L 5% of the EPA limit 2000 µg/L | 4/156 | SYR4 | 2012–2019 |
| Selenium | 7.02 µg/L 14% of the EPA limit 50 µg/L
worst single sample: 7.2 µg/L | 4/156 | SYR4 | 2012–2019 |
| Thallium, Total | 1.2 µg/L 60% of the EPA limit 2 µg/L | 1/156 | SYR4 | 2012–2019 |
| Lithium | 9.3 µg/L No EPA limit set | 1/30 | UCMR-5 | 2024 |
81 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCopperCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneCombined Radium (-226 And -228)DichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPfdaPfdoaPfeesaPfhpaPfhpsPfmbaPfmpaPFNAPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Pomona - City, Water Dept.
Is Pomona - City, Water Dept. tap water safe to drink?
EPA monitoring detected 31 contaminants in Pomona - City, Water Dept.'s water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.
What contaminants were detected in Pomona - City, Water Dept.'s water?
EPA monitoring detected Nitrate, Trichloroethylene, Tetrachloroethylene, 1,1-Dichloroethylene, TTHM, and others. The full list with the level and data source for each is above.
How many people does Pomona - City, Water Dept. serve?
Pomona - City, Water Dept. reports serving 151,713 people in California, per its EPA record.
Has Pomona - City, Water Dept. had any water quality violations?
The EPA has 10 violations on file for Pomona - City, Water Dept., of which 10 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.