Is Pocatello City of Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Local government
Counties served: Bannock

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.

health-based violations

957

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Resolved	2021-10-01 → 2021-12-31
MCL	Health-based	Resolved	2021-10-01 → 2021-12-31
MCL	Health-based	Resolved	2021-10-01 → 2021-12-31
MCL	Health-based	Resolved	2021-10-01 → 2021-12-31
MCL	Health-based	Resolved	2021-10-01 → 2021-12-31
MCL	Health-based	Resolved	2021-10-01 → 2021-12-31
MCL	Health-based	Resolved	2021-10-01 → 2021-12-31
MCL	Health-based	Archived	2004-07-01 → 2004-07-31
MCL	Health-based	Archived	1992-03-01 → 1992-03-31
MR	Monitoring	Archived	2025-04-01 → 2025-04-30

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	8380 µg/L 84% of the EPA limit 10000 µg/L worst single sample: 11930 µg/L	498/504	SYR4	2012–2019
TTHM	18.9 µg/L 24% of the EPA limit 80 µg/L worst single sample: 23.9 µg/L	134/177	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	4.181 µg/L 7% of the EPA limit 60 µg/L worst single sample: 16 µg/L	118/128	SYR4	2012–2019
Combined Uranium	2.4835 µg/L 8.3% of the EPA limit 30 µg/L worst single sample: 3.07 µg/L	34/34	SYR4	2013–2019
Combined Radium (-226 And -228)	1.935 pCi/L 39% of the EPA limit 5 pCi/L worst single sample: 3.74 pCi/L	20/20	SYR4	2013–2019
Barium	171 µg/L 8.6% of the EPA limit 2000 µg/L worst single sample: 179 µg/L	17/17	SYR4	2018–2019
Arsenic	2 µg/L 20% of the EPA limit 10 µg/L	16/17	SYR4	2018–2019
Lead	0.0050 mg/L 33% of the EPA limit 0.0150 mg/L	16/16	LCR	2026
Trichloroethylene	2.325 µg/L 47% of the EPA limit 5 µg/L worst single sample: 5.16 µg/L	16/90	SYR4	2012–2019
Selenium	4.3 µg/L 8.6% of the EPA limit 50 µg/L worst single sample: 5 µg/L	15/17	SYR4	2018–2019
Gross Alpha, Excl. Radon And U	6.878 pCi/L 46% of the EPA limit 15 pCi/L worst single sample: 8.11 pCi/L	12/27	SYR4	2013–2019
Lithium	42.3 µg/L No EPA limit set	12/12	UCMR-5	2024
Fluoride	300 µg/L 7.5% of the EPA limit 4000 µg/L	11/17	SYR4	2018–2019
Bromoform	10.123 µg/L No EPA limit set worst single sample: 10.2 µg/L	8/8	SYR4	2016–2018
Dibromoacetic Acid	3.828 µg/L No EPA limit set worst single sample: 3.93 µg/L	7/7	SYR4	2016–2018
Dibromochloromethane	3.279 µg/L No EPA limit set worst single sample: 3.3 µg/L	7/7	SYR4	2016–2018
Nitrite	227 µg/L 23% of the EPA limit 1000 µg/L worst single sample: 260 µg/L	7/17	SYR4	2018–2019
Nitrate-Nitrite	7762.5 µg/L 78% of the EPA limit 10000 µg/L worst single sample: 8650 µg/L	6/6	SYR4	2018–2019
Tetrachloroethylene	0.9475 µg/L 19% of the EPA limit 5 µg/L worst single sample: 0.9600 µg/L	6/90	SYR4	2012–2019
Chromium	6.6 µg/L 6.6% of the EPA limit 100 µg/L worst single sample: 8 µg/L	5/17	SYR4	2018–2019
Bromodichloromethane	0.5540 µg/L No EPA limit set worst single sample: 0.5600 µg/L	4/5	SYR4	2016–2018

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-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDichloroacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: ARMSTRONG, JUSTIN
Phone: 208-234-6174
Email: [email protected]

Frequently asked questions about Pocatello City of

Is Pocatello City of tap water safe to drink?

EPA monitoring detected 21 contaminants in Pocatello 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 Pocatello City of's water?

EPA monitoring detected Nitrate, TTHM, Total Haloacetic Acids (HAA5), Combined Uranium, Combined Radium (-226 And -228), and others. The full list with the level and data source for each is above.

How many people does Pocatello City of serve?

Pocatello City of reports serving 58,231 people in Idaho, per its EPA record.

Has Pocatello City of had any water quality violations?

The EPA has 957 violations on file for Pocatello City of, of which 9 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.