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Community Water System · PWS MT0000339

Superior Town Of

Superior, Montana 59872 - drinking water served from groundwater sources to 1,100 people, tracked in EPA SDWIS and UCMR5.

1,100
People served
14
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 14 drinking-water violations at Superior Town Of - below the Montana per-system average.

14
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
1,100
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Superior Town Of

Superior Town Of is a local-owned community water system that delivers drinking water to 1,100 residents in Superior, Montana (Mineral County) through 454 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 14 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 12 monitoring and reporting violations are on file. The most recent violation on record dates to 2017.

The most frequently cited contaminant at this system is Groundwater Rule, recorded in 4 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%).

Superior Town Of's 14 violations sit below 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
1,100
Total Violations
14
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
454
County
Mineral
School/Daycare
No
MCL Violations
0
Monitoring Violations
12
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Groundwater Rule MR 4 2017
Nitrate MR 2 1997
Carbofuran MR 1 1996
Aldicarb sulfone MR 1 1996
Aldicarb sulfoxide MR 1 1996
Aldicarb MR 1 1996
OXAMYL MR 1 1996
Coliform (TCR) MR 1 1998

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 Superior 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 MT0000339 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
2017 Groundwater Rule MR 4 SDWIS / MT0000339 / 0700
1998 Coliform (TCR) MR 1 SDWIS / MT0000339 / 3100
1997 Nitrate MR 2 SDWIS / MT0000339 / 1040
1996 Carbofuran MR 1 SDWIS / MT0000339 / 2046
1996 Aldicarb sulfone MR 1 SDWIS / MT0000339 / 2044
1996 Aldicarb sulfoxide MR 1 SDWIS / MT0000339 / 2043
1996 Aldicarb MR 1 SDWIS / MT0000339 / 2047
1996 OXAMYL MR 1 SDWIS / MT0000339 / 2036

How Superior Town Of Compares

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

Metric Superior Town Of Montana avg Federal benchmark
Total violations 14 131.4 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 62.2% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 1,100 492 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 Superior Town Of water safe to drink? ▼
Superior Town Of (PWS ID: MT0000339) has 14 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,100 people using Groundwater sources.
How many people does Superior Town Of serve? ▼
Superior Town Of serves 1,100 people in Superior, Montana. It is a Local-owned system using Groundwater water sources with 454 service connections.
What type of violations does Superior Town Of have? ▼
Superior Town Of has 14 total violations: 0 health-based violations (MCL exceedances or treatment failures), 12 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Superior Town Of water? ▼
No PFAS testing data is available for Superior Town Of under the EPA's UCMR5 monitoring program.
What water source does Superior Town Of use? ▼
Superior Town Of 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.