PlainWater
States → Montana

Community Water System · PWS MT0003104

South Hills Water Users Association

Polson, Montana 59860 - drinking water served from groundwater sources to 60 people, tracked in EPA SDWIS and UCMR5.

60
People served
391
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 391 drinking-water violations at South Hills Water Users Association - above the Montana per-system average.

391
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
60
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: South Hills Water Users Association

South Hills Water Users Association is a private-owned community water system that delivers drinking water to 60 residents in Polson, Montana (Lake County) through 29 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 391 total violations for this system , of which 0 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 388 monitoring and reporting violations are on file. The most recent violation on record dates to 2020.

The most frequently cited contaminant at this system is 1,2,4-Trichlorobenzene, recorded in 18 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, 5 of 45 UCMR5-tested systems have reported PFAS detections (11.1%).

South Hills Water Users Association's 391 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
60
Total Violations
391
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
29
County
Lake
School/Daycare
No
MCL Violations
0
Monitoring Violations
388
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
1,2,4-Trichlorobenzene MR 18 2020
cis-1,2-Dichloroethylene MR 18 2020
Xylenes, Total MR 18 2020
p-Dichlorobenzene MR 18 2020
trans-1,2-Dichloroethylene MR 18 2020
1,1,1-Trichloroethane MR 18 2020
1,2-Dichloropropane MR 18 2020
Tetrachloroethylene MR 18 2020
CHLOROBENZENE MR 18 2020
Ethylbenzene MR 18 2020
Styrene MR 18 2020
Carbon tetrachloride MR 18 2020
1,2-Dichloroethane MR 18 2020
Trichloroethylene MR 18 2020
DICHLOROMETHANE MR 18 2020
o-Dichlorobenzene MR 18 2020
1,1-Dichloroethylene MR 18 2020
Vinyl chloride MR 18 2020
1,1,2-Trichloroethane MR 18 2020
Benzene MR 18 2020
Toluene MR 18 2020
Coliform (TCR) MR 4 2001
Revised Total Coliform Rule MON 3 2020
Asbestos MR 3 2020
Consumer Confidence Rule Other 3 2008

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 South Hills Water Users Association.

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 MT0003104 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
2020 1,2,4-Trichlorobenzene MR 18 SDWIS / MT0003104 / 2378
2020 cis-1,2-Dichloroethylene MR 18 SDWIS / MT0003104 / 2380
2020 Xylenes, Total MR 18 SDWIS / MT0003104 / 2955
2020 p-Dichlorobenzene MR 18 SDWIS / MT0003104 / 2969
2020 trans-1,2-Dichloroethylene MR 18 SDWIS / MT0003104 / 2979
2020 1,1,1-Trichloroethane MR 18 SDWIS / MT0003104 / 2981
2020 1,2-Dichloropropane MR 18 SDWIS / MT0003104 / 2983
2020 Tetrachloroethylene MR 18 SDWIS / MT0003104 / 2987
2020 CHLOROBENZENE MR 18 SDWIS / MT0003104 / 2989
2020 Ethylbenzene MR 18 SDWIS / MT0003104 / 2992
2020 Styrene MR 18 SDWIS / MT0003104 / 2996
2020 Carbon tetrachloride MR 18 SDWIS / MT0003104 / 2982
2020 1,2-Dichloroethane MR 18 SDWIS / MT0003104 / 2980
2020 Trichloroethylene MR 18 SDWIS / MT0003104 / 2984
2020 DICHLOROMETHANE MR 18 SDWIS / MT0003104 / 2964

How South Hills Water Users Association Compares

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

Metric South Hills Water Users Association Montana avg Federal benchmark
Total violations 391 131.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 0 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 60 492 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 South Hills Water Users Association water safe to drink? ▼
South Hills Water Users Association (PWS ID: MT0003104) has 391 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 60 people using Groundwater sources.
How many people does South Hills Water Users Association serve? ▼
South Hills Water Users Association serves 60 people in Polson, Montana. It is a Private-owned system using Groundwater water sources with 29 service connections.
What type of violations does South Hills Water Users Association have? ▼
South Hills Water Users Association has 391 total violations: 0 health-based violations (MCL exceedances or treatment failures), 388 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in South Hills Water Users Association water? ▼
No PFAS testing data is available for South Hills Water Users Association under the EPA's UCMR5 monitoring program.
What water source does South Hills Water Users Association use? ▼
South Hills Water Users Association 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.