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Community Water System · PWS MT0002132

Mountain Shadows Estates Stevensville

Missoula, Montana 59806 - drinking water served from groundwater sources to 55 people, tracked in EPA SDWIS and UCMR5.

55
People served
229
EPA violations
24
Health-based
Untested
UCMR5 result

The verdict

EPA records 229 drinking-water violations at Mountain Shadows Estates Stevensville, 10% of them health-based - above the Montana per-system average.

229
Total EPA violations on record
10%
Health-based (MCL / treatment failure)
55
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Mountain Shadows Estates Stevensville

Mountain Shadows Estates Stevensville is a private-owned community water system that delivers drinking water to 55 residents in Missoula, Montana (Ravalli County) through 22 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 229 total violations for this system , of which 24 (10%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 199 monitoring and reporting violations are on file. The most recent violation on record dates to 2022.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 24 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Montana, EPA tracks 2,263 public water systems serving 1,112,267 people, with 297,270 cumulative violations and 25,922 health-based violations on record. About 95% of systems in the state carry at least one violation, and state-wide the average per system is 131.4 violations. Statewide, 5 of 45 UCMR5-tested systems have reported PFAS detections (11.1%).

Mountain Shadows Estates Stevensville's 229 violations sit above the Montana average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
55
Total Violations
229
Health-Based Violations
24
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
22
County
Ravalli
School/Daycare
No
MCL Violations
24
Monitoring Violations
199
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 24 2011
Nitrate-Nitrite MR 10 2012
Coliform (TCR) MR 8 2012
cis-1,2-Dichloroethylene MR 7 2011
Xylenes, Total MR 7 2011
DICHLOROMETHANE MR 7 2011
o-Dichlorobenzene MR 7 2011
p-Dichlorobenzene MR 7 2011
trans-1,2-Dichloroethylene MR 7 2011
1,1,1-Trichloroethane MR 7 2011
Carbon tetrachloride MR 7 2011
1,2-Dichloropropane MR 7 2011
1,1,2-Trichloroethane MR 7 2011
Styrene MR 7 2011
E. COLI MR 7 2022
1,2,4-Trichlorobenzene MR 7 2011
Vinyl chloride MR 7 2011
CHLOROBENZENE MR 7 2011
Toluene MR 7 2011
Ethylbenzene MR 7 2011
1,1-Dichloroethylene MR 7 2011
Tetrachloroethylene MR 7 2011
1,2-Dichloroethane MR 7 2011
Benzene MR 7 2011
Trichloroethylene MR 7 2011
Consumer Confidence Rule Other 4 2017
Dalapon MR 3 2002
2,4-D MR 3 2002
2,4,5-TP MR 3 2002
Pentachlorophenol MR 3 2002

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Mountain Shadows Estates Stevensville.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID MT0002132 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Montana Drinking Water Authority

Montana's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find MT regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2022 E. COLI MR 7 SDWIS / MT0002132 / 3014
2017 Consumer Confidence Rule Other 4 SDWIS / MT0002132 / 7000
2012 Nitrate-Nitrite MR 10 SDWIS / MT0002132 / 1038
2012 Coliform (TCR) MR 8 SDWIS / MT0002132 / 3100
2011 Coliform (TCR) MCL 24 SDWIS / MT0002132 / 3100
2011 cis-1,2-Dichloroethylene MR 7 SDWIS / MT0002132 / 2380
2011 Xylenes, Total MR 7 SDWIS / MT0002132 / 2955
2011 DICHLOROMETHANE MR 7 SDWIS / MT0002132 / 2964
2011 o-Dichlorobenzene MR 7 SDWIS / MT0002132 / 2968
2011 p-Dichlorobenzene MR 7 SDWIS / MT0002132 / 2969
2011 trans-1,2-Dichloroethylene MR 7 SDWIS / MT0002132 / 2979
2011 1,1,1-Trichloroethane MR 7 SDWIS / MT0002132 / 2981
2011 Carbon tetrachloride MR 7 SDWIS / MT0002132 / 2982
2011 1,2-Dichloropropane MR 7 SDWIS / MT0002132 / 2983
2011 1,1,2-Trichloroethane MR 7 SDWIS / MT0002132 / 2985

How Mountain Shadows Estates Stevensville Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Mountain Shadows Estates Stevensville Montana avg Federal benchmark
Total violations 229 131.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 24 11.5 Indicates a contaminant exceeded a federal MCL
PFAS detection None 11.1% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 55 492 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 2,263 regulated public water systems in Montana.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Mountain Shadows Estates Stevensville water safe to drink? ▼
Mountain Shadows Estates Stevensville (PWS ID: MT0002132) has 229 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 55 people using Groundwater sources.
How many people does Mountain Shadows Estates Stevensville serve? ▼
Mountain Shadows Estates Stevensville serves 55 people in Missoula, Montana. It is a Private-owned system using Groundwater water sources with 22 service connections.
What type of violations does Mountain Shadows Estates Stevensville have? ▼
Mountain Shadows Estates Stevensville has 229 total violations: 24 health-based violations (MCL exceedances or treatment failures), 199 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Mountain Shadows Estates Stevensville water? ▼
No PFAS testing data is available for Mountain Shadows Estates Stevensville under the EPA's UCMR5 monitoring program.
What water source does Mountain Shadows Estates Stevensville use? ▼
Mountain Shadows Estates Stevensville uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.