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Tap water quality report

Grand Valley Estates Subdivision

EPA monitoring tested this supplier for 67 contaminants and detected 10. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

67
contaminants tested
10
detected
50
people served
0
health-based violations
Montana rankingsLead in MontanaPFAS in Montana
Water source
Ground water
Ownership
Private
Counties served
Lewis and Clark

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
81
violations on file
0
still open
ViolationTypeStatusPeriod
MR Monitoring Resolved 2022-07-15
MR Monitoring Resolved 2022-07-15
MR Monitoring Resolved 2022-07-15
MR Monitoring Resolved 2021-10-01
MR Monitoring Resolved 2021-10-01
MR Monitoring Resolved 2021-10-01
MR Monitoring Resolved 2019-01-01 → 2019-12-31
MR Monitoring Resolved 2019-01-01 → 2019-12-31
MR Monitoring Resolved 2019-01-01 → 2019-12-31
MR Monitoring Resolved 2017-01-01 → 2019-12-31

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
310 µg/L 3.1%
of the EPA limit 10000 µg/L
 14/14 SYR4 2014–2018
Copper
199 µg/L 15%
of the EPA limit 1300 µg/L
 13/15 SYR4 2014–2018
Combined Uranium
2 µg/L 6.7%
of the EPA limit 30 µg/L
 6/6 SYR4 2014–2016
Gross Alpha, Excl. Radon And U
8.6 pCi/L 57%
of the EPA limit 15 pCi/L
 6/6 SYR4 2014–2016
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 5/5 LCR 2025
Combined Radium (-226 And -228)
2.7 pCi/L 54%
of the EPA limit 5 pCi/L
 3/5 SYR4 2014–2016
Di(2-ethylhexyl) Phthalate
5.8 µg/L 97%
of the EPA limit 6 µg/L
 2/4 SYR4 2014–2015
Arsenic
2 µg/L 20%
of the EPA limit 10 µg/L
 1/1 SYR4 2015
Fluoride
200 µg/L 5%
of the EPA limit 4000 µg/L
 1/1 SYR4 2015
Gross Beta Particle Activity
2.5 pCi/L
No EPA limit set
 1/5 SYR4 2014–2016
57 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, TotalAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDibromochloromethaneDinosebEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTTHMTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
WAGNER, TRISHA
Phone
406-403-4816
Email
HOA.GRANDVALLEYESTATES@GMAIL.COM

Frequently asked questions about Grand Valley Estates Subdivision

Is Grand Valley Estates Subdivision tap water safe to drink?

EPA monitoring detected 10 contaminants in Grand Valley Estates Subdivision'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 Grand Valley Estates Subdivision's water?

EPA monitoring detected Nitrate-Nitrite, Copper, Combined Uranium, Gross Alpha, Excl. Radon And U, Lead, and others. The full list with the level and data source for each is above.

How many people does Grand Valley Estates Subdivision serve?

Grand Valley Estates Subdivision reports serving 50 people in Montana, per its EPA record.

Has Grand Valley Estates Subdivision had any water quality violations?

The EPA has 81 violations on file for Grand Valley Estates Subdivision, 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.