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Tap water quality report

Nampa City of

EPA monitoring tested this supplier for 101 contaminants and detected 15. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

101
contaminants tested
15
detected
100,200
people served
4
health-based violations
Idaho rankingsLead in IdahoPFAS in Idaho
Water source
Ground water
Ownership
Local government
Counties served
Canyon

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.

4
health-based violations
261
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 2000-05-01 → 2000-05-31
MCL Health-based Archived 1992-09-01 → 1992-09-30
MCL Health-based Archived 1991-09-01 → 1991-09-30
MCL Health-based Archived 1991-04-01 → 1991-04-30
MR Monitoring Resolved 2023-01-01 → 2023-03-31
MR Monitoring Resolved 2023-01-01 → 2023-03-31
MR Monitoring Resolved 2023-01-01 → 2023-03-31
MR Monitoring Archived 2020-01-01 → 2022-12-31
MR Monitoring Archived 2020-01-01 → 2022-12-31
MR Monitoring Archived 2020-01-01 → 2022-12-31

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Nitrate
6185 µg/L 62%
of the EPA limit 10000 µg/L
worst single sample: 6880 µg/L
224/258 SYR4 2012–2019
TTHM
7.87 µg/L 9.8%
of the EPA limit 80 µg/L
worst single sample: 9.89 µg/L
84/128 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
5.857 µg/L 9.8%
of the EPA limit 60 µg/L
worst single sample: 132 µg/L
42/128 SYR4 2012–2019
Combined Uranium
18.4 µg/L 61%
of the EPA limit 30 µg/L
worst single sample: 25 µg/L
35/39 SYR4 2012–2018
Arsenic
7.4 µg/L 74%
of the EPA limit 10 µg/L
worst single sample: 8 µg/L
26/29 SYR4 2012–2019
Lithium
42.1 µg/L
No EPA limit set
 26/26 UCMR-5 2025
Fluoride
1460.5 µg/L 37%
of the EPA limit 4000 µg/L
worst single sample: 1520 µg/L
18/18 SYR4 2012–2019
Nitrate-Nitrite
5825 µg/L 58%
of the EPA limit 10000 µg/L
worst single sample: 6200 µg/L
16/16 SYR4 2013–2019
Chromium
5.6 µg/L 5.6%
of the EPA limit 100 µg/L
worst single sample: 7 µg/L
15/20 SYR4 2012–2019
Lead
0.0020 mg/L 13%
of the EPA limit 0.0150 mg/L
 15/15 LCR 2024
Barium
100 µg/L 5%
of the EPA limit 2000 µg/L
 14/20 SYR4 2012–2019
Combined Radium (-226 And -228)
2.077 pCi/L 42%
of the EPA limit 5 pCi/L
worst single sample: 2.32 pCi/L
7/21 SYR4 2012–2019
Gross Alpha, Excl. Radon And U
17.202 pCi/L 115%
of the EPA limit, at the 95th percentile of samples — 15 pCi/L
worst single sample: 18.3 pCi/L
3/3 SYR4 2012–2018
Nitrite
10 µg/L 1%
of the EPA limit 1000 µg/L
 2/17 SYR4 2013–2019
Di(2-ethylhexyl) Phthalate
1.43 µg/L 24%
of the EPA limit 6 µg/L
 1/30 SYR4 2012–2019
86 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
WENDLER, SHANE P
Phone
208-468-5860
Email
[email protected]

Frequently asked questions about Nampa City of

Is Nampa City of tap water safe to drink?

EPA monitoring detected 15 contaminants in Nampa 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 Nampa City of's water?

EPA monitoring detected Nitrate, TTHM, Total Haloacetic Acids (HAA5), Combined Uranium, Arsenic, and others. The full list with the level and data source for each is above.

How many people does Nampa City of serve?

Nampa City of reports serving 100,200 people in Idaho, per its EPA record.

Has Nampa City of had any water quality violations?

The EPA has 261 violations on file for Nampa City of, of which 4 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.