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.
15
health-based violations
17
violations on file
0
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| MCL | Health-based | Resolved | 2016-01-01 → 2016-03-31 |
| MCL | Health-based | Resolved | 2016-01-01 → 2016-03-31 |
| MCL | Health-based | Resolved | 2015-10-01 → 2015-12-31 |
| MCL | Health-based | Resolved | 2015-10-01 → 2015-12-31 |
| MCL | Health-based | Resolved | 2015-07-01 → 2015-09-30 |
| MCL | Health-based | Resolved | 2015-07-01 → 2015-09-30 |
| MCL | Health-based | Resolved | 2015-04-01 → 2015-06-30 |
| MCL | Health-based | Resolved | 2015-04-01 → 2015-06-30 |
| MCL | Health-based | Resolved | 2015-01-01 → 2015-03-31 |
| MCL | Health-based | Resolved | 2015-01-01 → 2015-03-31 |
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 |
|---|---|---|---|---|
| TTHM | 99.15 µg/L 124% of the EPA limit, at the 95th percentile of samples — 80 µg/L
worst single sample: 140 µg/L | 378/378 | SYR4 | 2012–2019 |
| Chloroform | 77 µg/L No EPA limit set
worst single sample: 120 µg/L | 377/378 | SYR4 | 2012–2019 |
| Bromodichloromethane | 25 µg/L No EPA limit set
worst single sample: 32 µg/L | 376/378 | SYR4 | 2012–2019 |
| Dibromochloromethane | 12 µg/L No EPA limit set
worst single sample: 17 µg/L | 360/378 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 57.16 µg/L 95% of the EPA limit 60 µg/L
worst single sample: 116 µg/L | 353/372 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 23 µg/L No EPA limit set
worst single sample: 50.8 µg/L | 345/372 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 31.68 µg/L No EPA limit set
worst single sample: 62.8 µg/L | 344/372 | SYR4 | 2012–2019 |
| Monochloroacetic Acid | 8.36 µg/L No EPA limit set
worst single sample: 9.6 µg/L | 143/372 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 2.355 µg/L No EPA limit set
worst single sample: 4.4 µg/L | 70/372 | SYR4 | 2012–2019 |
| Bromoform | 1.755 µg/L No EPA limit set
worst single sample: 2.1 µg/L | 50/378 | SYR4 | 2012–2019 |
| Fluoride | 213.4 µg/L 5.3% of the EPA limit 4000 µg/L
worst single sample: 288 µg/L | 29/68 | SYR4 | 2012–2019 |
| Arsenic | 4.617 µg/L 46% of the EPA limit 10 µg/L
worst single sample: 5.4 µg/L | 28/62 | SYR4 | 2012–2019 |
| Bromate | 5.775 µg/L 58% of the EPA limit 10 µg/L
worst single sample: 11 µg/L | 20/71 | SYR4 | 2012–2019 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 19/19 | LCR | 2024 |
| Nitrate | 1900 µg/L 19% of the EPA limit 10000 µg/L | 18/134 | SYR4 | 2012–2019 |
| Lead | 44.28 µg/L 295% of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 83 µg/L | 12/64 | SYR4 | 2012–2019 |
| Chromium | 92.115 µg/L 92% of the EPA limit 100 µg/L
worst single sample: 103 µg/L | 8/62 | SYR4 | 2012–2019 |
| Chlorite | 245 µg/L 25% of the EPA limit 1000 µg/L
worst single sample: 260 µg/L | 7/39 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 942600 µg/L 9426% of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 1000000 µg/L | 5/62 | SYR4 | 2012–2019 |
| Gross Beta Particle Activity | 1.6255 pCi/L No EPA limit set
worst single sample: 1.72 pCi/L | 4/13 | SYR4 | 2015–2018 |
| Barium | 37.85 µg/L 1.9% of the EPA limit 2000 µg/L
worst single sample: 38 µg/L | 2/56 | SYR4 | 2012–2019 |
| Cadmium | 2.245 µg/L 45% of the EPA limit 5 µg/L
worst single sample: 2.3 µg/L | 2/62 | SYR4 | 2012–2019 |
| Copper | 96 µg/L 7.4% of the EPA limit 1300 µg/L | 1/65 | SYR4 | 2012–2019 |
| Combined Uranium | 2.831 µg/L 9.4% of the EPA limit 30 µg/L | 1/16 | SYR4 | 2012–2019 |
| Monobromoacetic Acid | 1.7 µg/L No EPA limit set | 1/372 | SYR4 | 2012–2019 |
89 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Napa, City of
Is Napa, City of tap water safe to drink?
EPA monitoring detected 25 contaminants in Napa, City of'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 Napa, City of's water?
EPA monitoring detected TTHM, Chloroform, Bromodichloromethane, Dibromochloromethane, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.
How many people does Napa, City of serve?
Napa, City of reports serving 84,804 people in California, per its EPA record.
Has Napa, City of had any water quality violations?
The EPA has 17 violations on file for Napa, City of, of which 15 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.