Is Rocky Boy'S Rural 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

145

violations on file

still open

Violation	Type	Status	Period
TT	Health-based	Resolved	2017-07-19
TT	Health-based	Resolved	2017-07-19
MCL	Health-based	Resolved	2009-01-01 → 2009-01-31
MCL	Health-based	Resolved	2009-01-01 → 2009-01-31
MCL	Health-based	Resolved	2008-05-01 → 2008-05-31
MCL	Health-based	Resolved	2007-05-01 → 2007-05-31
MCL	Health-based	Resolved	2007-05-01 → 2007-05-31
MCL	Health-based	Resolved	2007-05-01 → 2007-05-31
MCL	Health-based	Resolved	2003-11-01 → 2003-11-30
MCL	Health-based	Resolved	2003-11-01 → 2003-11-30

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-Nitrite	1503.5 µg/L 15% of the EPA limit 10000 µg/L worst single sample: 2000 µg/L	112/148	SYR4	2012–2019
Fluoride	1080 µg/L 27% of the EPA limit 4000 µg/L worst single sample: 1200 µg/L	25/25	SYR4	2013–2019
Combined Uranium	5.28 µg/L 18% of the EPA limit 30 µg/L worst single sample: 6 µg/L	17/18	SYR4	2013–2019
Copper	227.25 µg/L 17% of the EPA limit 1300 µg/L worst single sample: 255 µg/L	16/21	SYR4	2015–2019
Arsenic	6 µg/L 60% of the EPA limit 10 µg/L	13/25	SYR4	2013–2019
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	12/12	LCR	2028
TTHM	35.6 µg/L 45% of the EPA limit 80 µg/L worst single sample: 40 µg/L	12/36	SYR4	2013–2019
Gross Alpha, Excl. Radon And U	7.9 pCi/L 53% of the EPA limit 15 pCi/L worst single sample: 8.8 pCi/L	11/18	SYR4	2013–2019
Selenium	12 µg/L 24% of the EPA limit 50 µg/L worst single sample: 20 µg/L	11/25	SYR4	2013–2019
Chloroform	29.85 µg/L No EPA limit set worst single sample: 33 µg/L	10/34	SYR4	2013–2019
Combined Radium (-226 And -228)	2.4 pCi/L 48% of the EPA limit 5 pCi/L	10/18	SYR4	2013–2019
Total Haloacetic Acids (HAA5)	21.1 µg/L 35% of the EPA limit 60 µg/L worst single sample: 22 µg/L	7/10	SYR4	2013–2018
Barium	137.5 µg/L 6.9% of the EPA limit 2000 µg/L worst single sample: 140 µg/L	6/25	SYR4	2013–2019
Bromodichloromethane	6.44 µg/L No EPA limit set worst single sample: 6.6 µg/L	5/34	SYR4	2013–2019
Trichloroacetic Acid	8.24 µg/L No EPA limit set worst single sample: 8.6 µg/L	5/8	SYR4	2013–2018
Dibromochloromethane	0.9600 µg/L No EPA limit set worst single sample: 0.9700 µg/L	3/34	SYR4	2013–2019
Dichloroacetic Acid	12.8 µg/L No EPA limit set worst single sample: 13 µg/L	3/8	SYR4	2013–2018
Chromium	32 µg/L 32% of the EPA limit 100 µg/L	1/25	SYR4	2013–2019
Dibromoacetic Acid	0.3300 µg/L No EPA limit set	1/8	SYR4	2013–2018
Lead	1 µg/L 6.7% of the EPA limit 15 µg/L	1/21	SYR4	2015–2019
Monochloroacetic Acid	0.8500 µg/L No EPA limit set	1/8	SYR4	2013–2018
Toluene	6.7 µg/L 0.7% of the EPA limit 1000 µg/L	1/28	SYR4	2013–2019
Xylenes, Total	2.9 µg/L 0% of the EPA limit 10000 µg/L	1/28	SYR4	2013–2019

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, TotalBromoformChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidNitriteOxamylPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: NAULT, TIM
Phone: 406-301-1852
Email: [email protected]

Frequently asked questions about Rocky Boy'S Rural Water

Is Rocky Boy'S Rural Water tap water safe to drink?

EPA monitoring detected 23 contaminants in Rocky Boy'S Rural 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 Rocky Boy'S Rural Water's water?

EPA monitoring detected Nitrate-Nitrite, Fluoride, Combined Uranium, Copper, Arsenic, and others. The full list with the level and data source for each is above.

How many people does Rocky Boy'S Rural Water serve?

Rocky Boy'S Rural Water reports serving 2,000 people in Montana, per its EPA record.

Has Rocky Boy'S Rural Water had any water quality violations?

The EPA has 145 violations on file for Rocky Boy'S Rural Water, of which 23 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.