Is Mnihnapa Water Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Native American

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

198

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Archived	2020-08-01 → 2020-08-31
MCL	Health-based	Archived	2020-08-01 → 2020-08-31
MCL	Health-based	Archived	2020-08-01 → 2020-08-31
TT	Health-based	Resolved	2016-02-01
TT	Health-based	Resolved	2016-02-01
TT	Health-based	Resolved	2016-02-01
MCL	Health-based	Resolved	2014-08-01 → 2014-08-31
MCL	Health-based	Resolved	2014-07-01 → 2014-07-31
TT	Health-based	Resolved	2014-06-02
TT	Health-based	Resolved	2014-06-02

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
Copper	195.1 µg/L 15% of the EPA limit 1300 µg/L worst single sample: 197 µg/L	20/20	SYR4	2014–2019
Nitrate-Nitrite	1260 µg/L 13% of the EPA limit 10000 µg/L	20/20	SYR4	2012–2019
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	13/13	LCR	2024
Lead	11.8 µg/L 79% of the EPA limit 15 µg/L worst single sample: 14 µg/L	5/20	SYR4	2014–2019
Barium	96 µg/L 4.8% of the EPA limit 2000 µg/L worst single sample: 100 µg/L	3/3	SYR4	2016–2019
Selenium	3.9 µg/L 7.8% of the EPA limit 50 µg/L worst single sample: 4 µg/L	3/3	SYR4	2016–2019
Combined Uranium	4.2 µg/L 14% of the EPA limit 30 µg/L	2/4	SYR4	2013–2019
Fluoride	295 µg/L 7.4% of the EPA limit 4000 µg/L worst single sample: 300 µg/L	2/2	SYR4	2018–2019
Bromodichloromethane	3.2 µg/L No EPA limit set	1/5	SYR4	2015–2019
Bromoform	0.5700 µg/L No EPA limit set	1/5	SYR4	2015–2019
Chloroform	2.5 µg/L No EPA limit set	1/5	SYR4	2015–2019
Chromium	10 µg/L 10% of the EPA limit 100 µg/L	1/3	SYR4	2016–2019
Combined Radium (-226 And -228)	0.6000 pCi/L 12% of the EPA limit 5 pCi/L	1/2	SYR4	2019
Dibromoacetic Acid	1.1 µg/L No EPA limit set	1/1	SYR4	2015
Dibromochloromethane	2.8 µg/L No EPA limit set	1/5	SYR4	2015–2019
Dichloroacetic Acid	1.2 µg/L No EPA limit set	1/1	SYR4	2015
TTHM	9.1 µg/L 11% of the EPA limit 80 µg/L	1/5	SYR4	2015–2019
Total Haloacetic Acids (HAA5)	2.7 µg/L 4.5% of the EPA limit 60 µg/L	1/1	SYR4	2015

62 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalArsenicAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateGross Alpha, Excl. Radon And UHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidOxamylPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: RAMONE, KASEY
Phone: 406-353-8313
Email: [email protected]

Frequently asked questions about Mnihnapa Water

Is Mnihnapa Water tap water safe to drink?

EPA monitoring detected 18 contaminants in Mnihnapa Water'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 Mnihnapa Water's water?

EPA monitoring detected Copper, Nitrate-Nitrite, Lead, Lead, Barium, and others. The full list with the level and data source for each is above.

How many people does Mnihnapa Water serve?

Mnihnapa Water reports serving 220 people in Montana, per its EPA record.

Has Mnihnapa Water had any water quality violations?

The EPA has 198 violations on file for Mnihnapa Water, of which 29 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.