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Tap water quality report

Grass Land Estates

EPA monitoring tested this supplier for 64 contaminants and detected 8. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

64
contaminants tested
8
detected
228
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
57
violations on file
0
still open
ViolationTypeStatusPeriod
MR Monitoring Resolved 2020-04-01 → 2020-06-30
MR Monitoring Resolved 2020-04-01 → 2020-06-30
MR Monitoring Resolved 2020-04-01 → 2020-06-30
MON Monitoring Resolved 2018-09-01 → 2018-09-30
MON Monitoring Resolved 2018-09-01 → 2018-09-30
MON Monitoring Resolved 2018-09-01 → 2018-09-30
MR Monitoring Resolved 2010-01-01
MR Monitoring Resolved 2010-01-01
MR Monitoring Resolved 2008-07-01
MR Monitoring Resolved 2008-07-01

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
10200 µg/L 102%
of the EPA limit, in the worst sample — 10000 µg/L
 16/16 SYR4 2012–2019
Copper
1560 µg/L 120%
of the EPA limit, in the worst sample — 1300 µg/L
 15/15 SYR4 2012–2018
Lead
0.0020 mg/L 13%
of the EPA limit 0.0150 mg/L
 8/8 LCR 2024
Fluoride
330 µg/L 8.3%
of the EPA limit 4000 µg/L
 3/3 SYR4 2013–2019
Lead
12 µg/L 80%
of the EPA limit 15 µg/L
 3/15 SYR4 2012–2018
Arsenic
2 µg/L 20%
of the EPA limit 10 µg/L
 2/3 SYR4 2013–2019
Barium
51 µg/L 2.6%
of the EPA limit 2000 µg/L
 2/3 SYR4 2013–2019
Selenium
1 µg/L 2%
of the EPA limit 50 µg/L
 2/3 SYR4 2013–2019
56 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-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromochloromethaneDinosebEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorOxamylPentachlorophenolPicloramSimazineStyreneTTHMTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
ROCKY MOUNTAIN OPERATIONS
Phone
406-442-2949
Email
info@rockymountainops.com

Frequently asked questions about Grass Land Estates

Is Grass Land Estates tap water safe to drink?

EPA monitoring detected 8 contaminants in Grass Land Estates'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 Grass Land Estates's water?

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

How many people does Grass Land Estates serve?

Grass Land Estates reports serving 228 people in Montana, per its EPA record.

Has Grass Land Estates had any water quality violations?

The EPA has 57 violations on file for Grass Land Estates, 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.