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Tap water quality report

Mountain Shadows Estates Stevensville

EPA monitoring tested this supplier for 68 contaminants and detected 10. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

68
contaminants tested
10
detected
55
people served
26
health-based violations
Montana rankingsLead in MontanaPFAS in Montana
Water source
Ground water
Ownership
Private
Counties served
Ravalli

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.

26
health-based violations
229
violations on file
2
still open
ViolationTypeStatusPeriod
TT Health-based Unaddressed 2025-12-13
TT Health-based Unaddressed 2025-12-13
MCL Health-based Resolved 2011-10-01 → 2011-10-31
MCL Health-based Resolved 2011-10-01 → 2011-10-31
MCL Health-based Resolved 2011-10-01 → 2011-10-31
MCL Health-based Resolved 2011-10-01 → 2011-10-31
MCL Health-based Resolved 2011-10-01 → 2011-10-31
MCL Health-based Resolved 2010-02-01 → 2010-02-28
MCL Health-based Resolved 2010-02-01 → 2010-02-28
MCL Health-based Resolved 2010-02-01 → 2010-02-28

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
Copper
248.1 µg/L 19%
of the EPA limit 1300 µg/L
worst single sample: 265 µg/L
14/15 SYR4 2013–2019
Lead
0.0010 mg/L 6.7%
of the EPA limit 0.0150 mg/L
 13/13 LCR 2025
Nitrate-Nitrite
956 µg/L 9.6%
of the EPA limit 10000 µg/L
worst single sample: 970 µg/L
8/8 SYR4 2012–2019
Lead
4.5 µg/L 30%
of the EPA limit 15 µg/L
worst single sample: 5 µg/L
6/15 SYR4 2013–2019
Nitrate
710 µg/L 7.1%
of the EPA limit 10000 µg/L
 4/4 SYR4 2015–2018
Barium
90 µg/L 4.5%
of the EPA limit 2000 µg/L
 2/2 SYR4 2015–2018
Fluoride
99.5 µg/L 2.5%
of the EPA limit 4000 µg/L
worst single sample: 100 µg/L
2/2 SYR4 2015–2018
Combined Radium (-226 And -228)
2.5 pCi/L 50%
of the EPA limit 5 pCi/L
 1/1 SYR4 2016
Combined Uranium
3 µg/L 10%
of the EPA limit 30 µg/L
 1/1 SYR4 2016
Gross Alpha, Excl. Radon And U
3.2 pCi/L 21%
of the EPA limit 15 pCi/L
 1/1 SYR4 2016
58 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, TotalBromodichloromethaneBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromochloromethaneDinosebEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTTHMTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
ADVANCED WATER SAMPLING
Phone
406-214-8285

Frequently asked questions about Mountain Shadows Estates Stevensville

Is Mountain Shadows Estates Stevensville tap water safe to drink?

EPA monitoring detected 10 contaminants in Mountain Shadows Estates Stevensville'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 Mountain Shadows Estates Stevensville's water?

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

How many people does Mountain Shadows Estates Stevensville serve?

Mountain Shadows Estates Stevensville reports serving 55 people in Montana, per its EPA record.

Has Mountain Shadows Estates Stevensville had any water quality violations?

The EPA has 229 violations on file for Mountain Shadows Estates Stevensville, 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.