Is Dry Prairie Rural Water Authority Tap Water Safe? Quality Report

Water source: SWP
Ownership: Mixed public/private
Counties served: Roosevelt

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

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Resolved	2015-04-01 → 2015-06-30
MCL	Health-based	Resolved	2015-04-01 → 2015-06-30
MCL	Health-based	Resolved	2015-04-01 → 2015-06-30
MCL	Health-based	Resolved	2015-04-01 → 2015-06-30
MCL	Health-based	Resolved	2015-04-01 → 2015-06-30
MCL	Health-based	Resolved	2015-04-01 → 2015-06-30
MCL	Health-based	Resolved	2015-04-01 → 2015-06-30
MCL	Health-based	Resolved	2015-04-01 → 2015-06-30
MCL	Health-based	Resolved	2015-04-01 → 2015-06-30
MCL	Health-based	Resolved	2015-04-01 → 2015-06-30

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	1263 µg/L 97% of the EPA limit 1300 µg/L worst single sample: 2180 µg/L	70/71	SYR4	2013–2018
Bromodichloromethane	26.15 µg/L No EPA limit set worst single sample: 31 µg/L	58/58	SYR4	2013–2019
Chloroform	110.3 µg/L No EPA limit set worst single sample: 146 µg/L	58/58	SYR4	2013–2019
Dibromochloromethane	6.44 µg/L No EPA limit set worst single sample: 9.3 µg/L	58/58	SYR4	2013–2019
TTHM	140.75 µg/L 176% of the EPA limit, at the 95th percentile of samples — 80 µg/L worst single sample: 176 µg/L	58/58	SYR4	2013–2019
Dichloroacetic Acid	45.6 µg/L No EPA limit set worst single sample: 60 µg/L	57/57	SYR4	2013–2019
Total Haloacetic Acids (HAA5)	106.4 µg/L 177% of the EPA limit, at the 95th percentile of samples — 60 µg/L worst single sample: 113 µg/L	57/57	SYR4	2013–2019
Trichloroacetic Acid	48 µg/L No EPA limit set worst single sample: 67 µg/L	57/57	SYR4	2013–2019
Dibromoacetic Acid	1.71 µg/L No EPA limit set worst single sample: 2.1 µg/L	50/57	SYR4	2013–2019
Monobromoacetic Acid	1.175 µg/L No EPA limit set worst single sample: 1.2 µg/L	26/57	SYR4	2013–2019
Monochloroacetic Acid	4.3 µg/L No EPA limit set worst single sample: 4.9 µg/L	21/57	SYR4	2013–2019
Lead	34.3 µg/L 229% of the EPA limit, at the 95th percentile of samples — 15 µg/L worst single sample: 98 µg/L	15/71	SYR4	2013–2018
Lead	0.0030 mg/L 20% of the EPA limit 0.0150 mg/L	12/12	LCR	2021

1 contaminants tested, none detected

Bromoform

Utility contact

Contact: SHERMAN, JONI
Phone: 406-787-5382

Frequently asked questions about Dry Prairie Rural Water Authority

Is Dry Prairie Rural Water Authority tap water safe to drink?

EPA monitoring detected 13 contaminants in Dry Prairie Rural Water Authority'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 Dry Prairie Rural Water Authority's water?

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

How many people does Dry Prairie Rural Water Authority serve?

Dry Prairie Rural Water Authority reports serving 3,005 people in Montana, per its EPA record.

Has Dry Prairie Rural Water Authority had any water quality violations?

The EPA has 49 violations on file for Dry Prairie Rural Water Authority, of which 26 are health-based (a contaminant limit or required treatment was breached) and 2 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.