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Community Water System · PWS MT0000301

Opheim Town Of

Opheim, Montana 59250 - drinking water served from surface water sources to 111 people, tracked in EPA SDWIS and UCMR5.

111
People served
254
EPA violations
105
Health-based
Untested
UCMR5 result

The verdict

EPA records 254 drinking-water violations at Opheim Town Of, 41% of them health-based - above the Montana per-system average.

254
Total EPA violations on record
41%
Health-based (MCL / treatment failure)
111
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Opheim Town Of

Opheim Town Of is a local-owned community water system that delivers drinking water to 111 residents in Opheim, Montana (Valley County) through 69 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 254 total violations for this system , of which 105 (41%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 143 monitoring and reporting violations are on file. The most recent violation on record dates to 2021.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 96 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%).

Opheim Town Of's 254 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
111
Total Violations
254
Health-Based Violations
105
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
69
County
Valley
School/Daycare
No
MCL Violations
105
Monitoring Violations
143
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 96 2015
Barium MR 16 2020
Chromium MR 16 2020
Fluoride MR 16 2020
Selenium MR 16 2020
Cadmium MR 16 2020
Mercury MR 16 2020
Coliform (TCR) MR 13 2014
Revised Total Coliform Rule MCL 9 2021
Nitrate-Nitrite MR 8 2010
OXAMYL MR 6 1999
Simazine MR 6 1999
Consumer Confidence Rule Other 5 2013
Lead and Copper Rule MR 5 2014
E. COLI MR 5 2015
Revised Total Coliform Rule MON 3 2020
Nitrate MR 1 1997

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 Opheim Town Of.

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 MT0000301 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
2021 Revised Total Coliform Rule MCL 9 SDWIS / MT0000301 / 8000
2020 Barium MR 16 SDWIS / MT0000301 / 1010
2020 Chromium MR 16 SDWIS / MT0000301 / 1020
2020 Fluoride MR 16 SDWIS / MT0000301 / 1025
2020 Selenium MR 16 SDWIS / MT0000301 / 1045
2020 Cadmium MR 16 SDWIS / MT0000301 / 1015
2020 Mercury MR 16 SDWIS / MT0000301 / 1035
2020 Revised Total Coliform Rule MON 3 SDWIS / MT0000301 / 8000
2015 Coliform (TCR) MCL 96 SDWIS / MT0000301 / 3100
2015 E. COLI MR 5 SDWIS / MT0000301 / 3014
2014 Coliform (TCR) MR 13 SDWIS / MT0000301 / 3100
2014 Lead and Copper Rule MR 5 SDWIS / MT0000301 / 5000
2013 Consumer Confidence Rule Other 5 SDWIS / MT0000301 / 7000
2010 Nitrate-Nitrite MR 8 SDWIS / MT0000301 / 1038
1999 OXAMYL MR 6 SDWIS / MT0000301 / 2036

How Opheim Town Of Compares

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

Metric Opheim Town Of Montana avg Federal benchmark
Total violations 254 131.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 105 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 111 492 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 Opheim Town Of water safe to drink? ▼
Opheim Town Of (PWS ID: MT0000301) has 254 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 111 people using Surface Water sources.
How many people does Opheim Town Of serve? ▼
Opheim Town Of serves 111 people in Opheim, Montana. It is a Local-owned system using Surface Water water sources with 69 service connections.
What type of violations does Opheim Town Of have? ▼
Opheim Town Of has 254 total violations: 105 health-based violations (MCL exceedances or treatment failures), 143 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Opheim Town Of water? ▼
No PFAS testing data is available for Opheim Town Of under the EPA's UCMR5 monitoring program.
What water source does Opheim Town Of use? ▼
Opheim Town Of uses Surface Water 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.