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Tap water quality report

Grant Creek Water Users Association Inc

EPA monitoring tested this supplier for 72 contaminants and detected 11. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

72
contaminants tested
11
detected
380
people served
4
health-based violations
Montana rankingsLead in MontanaPFAS in Montana
Water source
Ground water
Ownership
Private
Counties served
Missoula

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.

4
health-based violations
87
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 1995-06-01 → 1995-06-30
MCL Health-based Resolved 1994-10-01 → 1994-10-31
MCL Health-based Resolved 1992-05-01 → 1992-05-31
MCL Health-based Resolved 1992-05-01 → 1992-05-31
Other Monitoring Resolved 2018-07-01
Other Monitoring Resolved 2018-07-01
MR Monitoring Resolved 2012-01-01 → 2012-03-31
MR Monitoring Resolved 2012-01-01 → 2012-03-31
MR Monitoring Resolved 2012-01-01 → 2012-03-31
MR Monitoring Resolved 2012-01-01 → 2012-03-31

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 20/20 LCR 2025
Nitrate-Nitrite
680 µg/L 6.8%
of the EPA limit 10000 µg/L
 16/16 SYR4 2012–2019
Copper
1033.8 µg/L 80%
of the EPA limit 1300 µg/L
worst single sample: 1220 µg/L
15/15 SYR4 2013–2019
Bromodichloromethane
0.9650 µg/L
No EPA limit set
worst single sample: 1 µg/L
3/6 SYR4 2013–2019
Chloroform
1.73 µg/L
No EPA limit set
worst single sample: 1.8 µg/L
3/6 SYR4 2013–2019
TTHM
2.96 µg/L 3.7%
of the EPA limit 80 µg/L
worst single sample: 3.1 µg/L
3/6 SYR4 2013–2019
Dichloroacetic Acid
1.465 µg/L
No EPA limit set
worst single sample: 1.5 µg/L
2/3 SYR4 2013–2019
Total Haloacetic Acids (HAA5)
1.49 µg/L 2.5%
of the EPA limit 60 µg/L
worst single sample: 1.5 µg/L
2/3 SYR4 2013–2019
Barium
110 µg/L 5.5%
of the EPA limit 2000 µg/L
 1/1 SYR4 2012
Gross Alpha, Excl. Radon And U
1.1 pCi/L 7.3%
of the EPA limit 15 pCi/L
 1/1 SYR4 2013
Lead
1 µg/L 6.7%
of the EPA limit 15 µg/L
 1/15 SYR4 2013–2019
61 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, TotalArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)Combined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDibromochloromethaneDinosebEndrinEthylbenzeneFluorideHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
HAYES, STEVE
Phone
406-549-3389
Email
[email protected]

Frequently asked questions about Grant Creek Water Users Association Inc

Is Grant Creek Water Users Association Inc tap water safe to drink?

EPA monitoring detected 11 contaminants in Grant Creek Water Users Association Inc'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 Grant Creek Water Users Association Inc's water?

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

How many people does Grant Creek Water Users Association Inc serve?

Grant Creek Water Users Association Inc reports serving 380 people in Montana, per its EPA record.

Has Grant Creek Water Users Association Inc had any water quality violations?

The EPA has 87 violations on file for Grant Creek Water Users Association Inc, of which 4 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.