Is St Labre Indian School Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Private
Counties served: Rosebud

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.

209

health-based violations

1,495

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Resolved	2025-10-01 → 2025-12-31
MCL	Health-based	Resolved	2025-10-01 → 2025-12-31
MCL	Health-based	Resolved	2025-10-01 → 2025-12-31
MCL	Health-based	Resolved	2025-10-01 → 2025-12-31
MCL	Health-based	Resolved	2025-10-01 → 2025-12-31
MCL	Health-based	Resolved	2025-10-01 → 2025-12-31
MCL	Health-based	Resolved	2025-10-01 → 2025-12-31
MCL	Health-based	Resolved	2025-10-01 → 2025-12-31
MCL	Health-based	Resolved	2024-07-01 → 2024-09-30
MCL	Health-based	Resolved	2024-07-01 → 2024-09-30

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
Copper	745.2 µg/L 57% of the EPA limit 1300 µg/L worst single sample: 909 µg/L	49/52	SYR4	2013–2018
Bromodichloromethane	51.4 µg/L No EPA limit set worst single sample: 67 µg/L	35/42	SYR4	2012–2019
Bromoform	53.2 µg/L No EPA limit set worst single sample: 70 µg/L	35/42	SYR4	2012–2019
Chloroform	25.9 µg/L No EPA limit set worst single sample: 37 µg/L	35/42	SYR4	2012–2019
Dibromochloromethane	74.6 µg/L No EPA limit set worst single sample: 86 µg/L	35/42	SYR4	2012–2019
TTHM	189 µg/L 236% of the EPA limit, at the 95th percentile of samples — 80 µg/L worst single sample: 216 µg/L	35/41	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	32.45 µg/L 54% of the EPA limit 60 µg/L worst single sample: 42 µg/L	34/35	SYR4	2012–2019
Dibromoacetic Acid	15.86 µg/L No EPA limit set worst single sample: 20 µg/L	33/35	SYR4	2012–2019
Dichloroacetic Acid	8.36 µg/L No EPA limit set worst single sample: 12 µg/L	29/35	SYR4	2012–2019
Trichloroacetic Acid	7.83 µg/L No EPA limit set worst single sample: 8.5 µg/L	27/35	SYR4	2012–2019
Monobromoacetic Acid	1.495 µg/L No EPA limit set worst single sample: 3.2 µg/L	22/35	SYR4	2012–2019
Lead	10.3 µg/L 69% of the EPA limit 15 µg/L worst single sample: 11.2 µg/L	16/52	SYR4	2013–2018
Lead	0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L	15/15	LCR	2025
Nitrate-Nitrite	380 µg/L 3.8% of the EPA limit 10000 µg/L	14/20	SYR4	2012–2019
Combined Radium (-226 And -228)	1.15755 pCi/L 23% of the EPA limit 5 pCi/L worst single sample: 1.19 pCi/L	2/5	SYR4	2012–2016
Di(2-ethylhexyl) Phthalate	8.47 µg/L 141% of the EPA limit, at the 95th percentile of samples — 6 µg/L worst single sample: 8.7 µg/L	2/7	SYR4	2012–2019
Fluoride	1845 µg/L 46% of the EPA limit 4000 µg/L worst single sample: 1900 µg/L	2/2	SYR4	2017–2019
Gross Alpha, Excl. Radon And U	2.061 pCi/L 14% of the EPA limit 15 pCi/L worst single sample: 2.08 pCi/L	2/5	SYR4	2012–2016
Gross Beta Particle Activity	4.7415 pCi/L No EPA limit set worst single sample: 4.76 pCi/L	2/3	SYR4	2012–2013
Monochloroacetic Acid	8.22 µg/L No EPA limit set worst single sample: 8.6 µg/L	2/35	SYR4	2012–2019
Selenium	6.75 µg/L 14% of the EPA limit 50 µg/L worst single sample: 7 µg/L	2/2	SYR4	2016–2019
Barium	160 µg/L 8% of the EPA limit 2000 µg/L	1/2	SYR4	2016–2019
Chromium	7 µg/L 7% of the EPA limit 100 µg/L	1/2	SYR4	2016–2019
Toluene	0.6700 µg/L 0.1% of the EPA limit 1000 µg/L	1/5	SYR4	2012–2019

53 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, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorOxamylPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: THARP, FRED
Phone: 406-784-4597

Frequently asked questions about St Labre Indian School

Is St Labre Indian School tap water safe to drink?

EPA monitoring detected 24 contaminants in St Labre Indian School'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 St Labre Indian School's water?

EPA monitoring detected Copper, Bromodichloromethane, Bromoform, Chloroform, Dibromochloromethane, and others. The full list with the level and data source for each is above.

How many people does St Labre Indian School serve?

St Labre Indian School reports serving 650 people in Montana, per its EPA record.

Has St Labre Indian School had any water quality violations?

The EPA has 1495 violations on file for St Labre Indian School, of which 209 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.