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Community Water System · PWS MT0002171

Western Mobile Village Dillon

Alder, Montana 59710 - drinking water served from groundwater sources to 75 people, tracked in EPA SDWIS and UCMR5.

75
People served
648
EPA violations
9
Health-based
Untested
UCMR5 result

The verdict

EPA records 648 drinking-water violations at Western Mobile Village Dillon, 1% of them health-based - above the Montana per-system average.

648
Total EPA violations on record
1%
Health-based (MCL / treatment failure)
75
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Western Mobile Village Dillon

Western Mobile Village Dillon is a private-owned community water system that delivers drinking water to 75 residents in Alder, Montana (Beaverhead County) through 31 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 648 total violations for this system , of which 9 (1%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 597 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 44 violations (MR). 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, 28 of 45 UCMR5-tested systems have reported PFAS detections (62.2%).

Western Mobile Village Dillon's 648 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
75
Total Violations
648
Health-Based Violations
9
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
31
County
Beaverhead
School/Daycare
No
MCL Violations
9
Monitoring Violations
597
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 44 2012
Consumer Confidence Rule Other 35 2025
Lead and Copper Rule MR 16 2024
Endrin MR 15 2014
Methoxychlor MR 15 2014
Dalapon MR 15 2014
Di(2-ethylhexyl) adipate MR 15 2014
OXAMYL MR 15 2014
Di(2-ethylhexyl) phthalate MR 15 2014
Picloram MR 15 2014
Hexachlorocyclopentadiene MR 15 2014
Aldicarb sulfoxide MR 15 2014
Aldicarb sulfone MR 15 2014
Carbofuran MR 15 2014
Atrazine MR 15 2014
Heptachlor MR 15 2014
2,4-D MR 15 2014
2,4,5-TP MR 15 2014
HEXACHLOROBENZENE MR 15 2014
Benzo(a)pyrene MR 15 2014
Pentachlorophenol MR 15 2014
Chlordane MR 15 2014
Nitrate-Nitrite MR 15 2020
BHC-GAMMA MR 15 2014
Aldicarb MR 15 2014
Heptachlor epoxide MR 15 2014
Dinoseb MR 15 2014
LASSO MR 15 2014
Simazine MR 15 2014
Toxaphene MR 15 2014

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 Western Mobile Village Dillon.

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 MT0002171 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
2025 Consumer Confidence Rule Other 35 SDWIS / MT0002171 / 7000
2024 Lead and Copper Rule MR 16 SDWIS / MT0002171 / 5000
2020 Nitrate-Nitrite MR 15 SDWIS / MT0002171 / 1038
2019 Revised Total Coliform Rule MON 6 SDWIS / MT0002171 / 8000
2015 Coliform (TCR) MCL 9 SDWIS / MT0002171 / 3100
2015 E. COLI MR 3 SDWIS / MT0002171 / 3014
2014 Endrin MR 15 SDWIS / MT0002171 / 2005
2014 Methoxychlor MR 15 SDWIS / MT0002171 / 2015
2014 Dalapon MR 15 SDWIS / MT0002171 / 2031
2014 Di(2-ethylhexyl) adipate MR 15 SDWIS / MT0002171 / 2035
2014 OXAMYL MR 15 SDWIS / MT0002171 / 2036
2014 Di(2-ethylhexyl) phthalate MR 15 SDWIS / MT0002171 / 2039
2014 Picloram MR 15 SDWIS / MT0002171 / 2040
2014 Hexachlorocyclopentadiene MR 15 SDWIS / MT0002171 / 2042
2014 Aldicarb sulfoxide MR 15 SDWIS / MT0002171 / 2043

How Western Mobile Village Dillon Compares

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

Metric Western Mobile Village Dillon Montana avg Federal benchmark
Total violations 648 131.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 9 11.5 Indicates a contaminant exceeded a federal MCL
PFAS detection None 62.2% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 75 492 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 Western Mobile Village Dillon water safe to drink? ▼
Western Mobile Village Dillon (PWS ID: MT0002171) has 648 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 75 people using Groundwater sources.
How many people does Western Mobile Village Dillon serve? ▼
Western Mobile Village Dillon serves 75 people in Alder, Montana. It is a Private-owned system using Groundwater water sources with 31 service connections.
What type of violations does Western Mobile Village Dillon have? ▼
Western Mobile Village Dillon has 648 total violations: 9 health-based violations (MCL exceedances or treatment failures), 597 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Western Mobile Village Dillon water? ▼
No PFAS testing data is available for Western Mobile Village Dillon under the EPA's UCMR5 monitoring program.
What water source does Western Mobile Village Dillon use? ▼
Western Mobile Village Dillon 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.