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Tap water quality report

Blue Grass Water Users Association

EPA monitoring tested this supplier for 61 contaminants and detected 11. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

61
contaminants tested
11
detected
60
people served
0
health-based violations
Montana rankingsLead in MontanaPFAS in Montana
Water source
Ground water
Ownership
Private
Counties served
Yellowstone

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.

0
health-based violations
180
violations on file
0
still open
ViolationTypeStatusPeriod
MON Monitoring Resolved 2025-10-01 → 2025-10-31
MON Monitoring Resolved 2025-10-01 → 2025-10-31
MON Monitoring Resolved 2025-10-01 → 2025-10-31
MR Monitoring Resolved 2024-12-30
MR Monitoring Resolved 2024-12-30
MR Monitoring Resolved 2021-12-30
MR Monitoring Resolved 2021-12-30
Other Monitoring Resolved 2021-07-01
Other Monitoring Resolved 2021-07-01
MR Monitoring Resolved 2020-01-01 → 2022-12-31

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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Nitrate-Nitrite
7290 µg/L 73%
of the EPA limit 10000 µg/L
 26/26 SYR4 2012–2019
Copper
730 µg/L 56%
of the EPA limit 1300 µg/L
 16/16 SYR4 2013–2018
Lead
0.0020 mg/L 13%
of the EPA limit 0.0150 mg/L
 14/14 LCR 2024
Lead
3.5 µg/L 23%
of the EPA limit 15 µg/L
 12/16 SYR4 2013–2018
Fluoride
600 µg/L 15%
of the EPA limit 4000 µg/L
 3/3 SYR4 2013–2019
Selenium
4 µg/L 8%
of the EPA limit 50 µg/L
 3/3 SYR4 2013–2019
Barium
12 µg/L 0.6%
of the EPA limit 2000 µg/L
 2/3 SYR4 2013–2019
Arsenic
0.7400 µg/L 7.4%
of the EPA limit 10 µg/L
 1/3 SYR4 2013–2019
Combined Uranium
10.9 µg/L 36%
of the EPA limit 30 µg/L
 1/1 SYR4 2019
Dichloromethane
2 µg/L 40%
of the EPA limit 5 µg/L
 1/7 SYR4 2013–2018
Gross Alpha, Excl. Radon And U
8.61 pCi/L 57%
of the EPA limit 15 pCi/L
 1/2 SYR4 2016–2019
50 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorOxamylPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
BRANDON, JACK
Phone
406-672-5445

Frequently asked questions about Blue Grass Water Users Association

Is Blue Grass Water Users Association tap water safe to drink?

EPA monitoring detected 11 contaminants in Blue Grass Water Users Association'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 Blue Grass Water Users Association's water?

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

How many people does Blue Grass Water Users Association serve?

Blue Grass Water Users Association reports serving 60 people in Montana, per its EPA record.

Has Blue Grass Water Users Association had any water quality violations?

The EPA has 180 violations on file for Blue Grass Water Users Association, of which 0 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.