Is Fort Belknap Agency Water Tap Water Safe? Quality Report

Water source: Surface 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.

336

health-based violations

577

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Archived	2026-01-01 → 2026-03-31
MCL	Health-based	Archived	2025-10-01 → 2025-12-31
TT	Health-based	Archived	2025-10-01 → 2025-12-31
TT	Health-based	Archived	2025-10-01 → 2025-12-31
MCL	Health-based	Archived	2025-07-01 → 2025-09-30
TT	Health-based	Archived	2025-04-01 → 2025-06-30
MCL	Health-based	Archived	2025-04-01 → 2025-06-30
MCL	Health-based	Archived	2025-01-01 → 2025-03-31
MCL	Health-based	Archived	2025-01-01 → 2025-03-31
TT	Health-based	Archived	2025-01-01 → 2025-03-31

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 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
TTHM	167.9 µg/L 210% of the EPA limit, at the 95th percentile of samples — 80 µg/L worst single sample: 205 µg/L	43/43	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	76.8 µg/L 128% of the EPA limit, at the 95th percentile of samples — 60 µg/L worst single sample: 148 µg/L	37/37	SYR4	2012–2019
Bromodichloromethane	42 µg/L No EPA limit set worst single sample: 43 µg/L	35/35	SYR4	2013–2019
Chloroform	134 µg/L No EPA limit set worst single sample: 164 µg/L	35/35	SYR4	2013–2019
Dibromochloromethane	28.6 µg/L No EPA limit set worst single sample: 34 µg/L	35/35	SYR4	2013–2019
Copper	53.6 µg/L 4.1% of the EPA limit 1300 µg/L worst single sample: 73 µg/L	29/29	SYR4	2013–2019
Dichloroacetic Acid	39 µg/L No EPA limit set worst single sample: 62 µg/L	29/29	SYR4	2013–2019
Trichloroacetic Acid	57 µg/L No EPA limit set worst single sample: 71 µg/L	29/29	SYR4	2013–2019
Dibromoacetic Acid	7.58 µg/L No EPA limit set worst single sample: 8.2 µg/L	28/29	SYR4	2013–2019
Bromoform	5.6 µg/L No EPA limit set worst single sample: 6.4 µg/L	21/35	SYR4	2013–2019
Lead	0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L	12/12	LCR	2025
Monobromoacetic Acid	1.42 µg/L No EPA limit set worst single sample: 1.5 µg/L	9/29	SYR4	2013–2019
Nitrate-Nitrite	30 µg/L 0.3% of the EPA limit 10000 µg/L	6/16	SYR4	2012–2019
Monochloroacetic Acid	11.42 µg/L No EPA limit set worst single sample: 12 µg/L	5/29	SYR4	2013–2019
Barium	79 µg/L 4% of the EPA limit 2000 µg/L worst single sample: 80 µg/L	2/2	SYR4	2016–2018
Arsenic	2 µg/L 20% of the EPA limit 10 µg/L	1/2	SYR4	2016–2018
Chromium	6 µg/L 6% of the EPA limit 100 µg/L	1/2	SYR4	2016–2018
Combined Radium (-226 And -228)	1 pCi/L 20% of the EPA limit 5 pCi/L	1/1	SYR4	2019
Combined Uranium	1.3 µg/L 4.3% of the EPA limit 30 µg/L	1/1	SYR4	2019
Fluoride	200 µg/L 5% of the EPA limit 4000 µg/L	1/1	SYR4	2018
Lead	1 µg/L 6.7% of the EPA limit 15 µg/L	1/29	SYR4	2013–2019
Selenium	1 µg/L 2% of the EPA limit 50 µg/L	1/2	SYR4	2016–2018

58 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, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateGross Alpha, Excl. Radon And UHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorOxamylPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl 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 Fort Belknap Agency Water

Is Fort Belknap Agency Water tap water safe to drink?

EPA monitoring detected 22 contaminants in Fort Belknap Agency 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 Fort Belknap Agency Water's water?

EPA monitoring detected TTHM, Total Haloacetic Acids (HAA5), Bromodichloromethane, Chloroform, Dibromochloromethane, and others. The full list with the level and data source for each is above.

How many people does Fort Belknap Agency Water serve?

Fort Belknap Agency Water reports serving 2,600 people in Montana, per its EPA record.

Has Fort Belknap Agency Water had any water quality violations?

The EPA has 577 violations on file for Fort Belknap Agency Water, of which 336 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.