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Tap water quality report

Napa, City of

EPA monitoring tested this supplier for 114 contaminants and detected 25. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

114
contaminants tested
25
detected
84,804
people served
15
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Surface water
Ownership
Local government
Counties served
Napa

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
ViolationTypeStatusPeriod
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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
TTHM
140 µg/L 175%
of the EPA limit, in the worst sample — 80 µg/L
 378/378 SYR4 2012–2019
Chloroform
120 µg/L
No EPA limit set
 377/378 SYR4 2012–2019
Bromodichloromethane
32 µg/L
No EPA limit set
 376/378 SYR4 2012–2019
Dibromochloromethane
17 µg/L
No EPA limit set
 360/378 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
116 µg/L 193%
of the EPA limit, in the worst sample — 60 µg/L
 353/372 SYR4 2012–2019
Dichloroacetic Acid
50.8 µg/L
No EPA limit set
 345/372 SYR4 2012–2019
Trichloroacetic Acid
62.8 µg/L
No EPA limit set
 344/372 SYR4 2012–2019
Monochloroacetic Acid
9.6 µg/L
No EPA limit set
 143/372 SYR4 2012–2019
Dibromoacetic Acid
4.4 µg/L
No EPA limit set
 70/372 SYR4 2012–2019
Bromoform
2.1 µg/L
No EPA limit set
 50/378 SYR4 2012–2019
Fluoride
288 µg/L 7.2%
of the EPA limit 4000 µg/L
 29/68 SYR4 2012–2019
Arsenic
5.4 µg/L 54%
of the EPA limit 10 µg/L
 28/62 SYR4 2012–2019
Bromate
11 µg/L 110%
of the EPA limit, in the worst sample — 10 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
83 µg/L 553%
of the EPA limit, in the worst sample — 15 µg/L
 12/64 SYR4 2012–2019
Chromium
103 µg/L 103%
of the EPA limit, in the worst sample — 100 µg/L
 8/62 SYR4 2012–2019
Chlorite
260 µg/L 26%
of the EPA limit 1000 µg/L
 7/39 SYR4 2012–2019
Nitrate-Nitrite
1000000 µg/L 10000%
of the EPA limit, in the worst sample — 10000 µg/L
 5/62 SYR4 2012–2019
Gross Beta Particle Activity
1.72 pCi/L
No EPA limit set
 4/13 SYR4 2015–2018
Barium
38 µg/L 1.9%
of the EPA limit 2000 µg/L
 2/56 SYR4 2012–2019
Cadmium
2.3 µg/L 46%
of the EPA limit 5 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

Contact
KEBBAS, ERIN
Phone
707-253-0822
Email
ekebbas@cityofnapa.org

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.