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Community Water System · PWS MT0000329

Sheridan Town Of

Sheridan, Montana 59749 - drinking water served from groundwater sources to 632 people, tracked in EPA SDWIS and UCMR5.

632
People served
123
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 123 drinking-water violations at Sheridan Town Of - below the Montana per-system average.

123
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
632
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Sheridan Town Of

Sheridan Town Of is a local-owned community water system that delivers drinking water to 632 residents in Sheridan, Montana (Madison County) through 413 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 123 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 111 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 31 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%).

Sheridan Town Of's 123 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
632
Total Violations
123
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
413
County
Madison
School/Daycare
No
MCL Violations
0
Monitoring Violations
111
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 31 2008
Lead and Copper Rule MR 20 2024
Chlorine MR 12 2014
Nitrate-Nitrite MR 6 2008
Consumer Confidence Rule Other 6 2014
Antimony, Total MR 3 2002
Thallium, Total MR 3 2002
Total Haloacetic Acids (HAA5) MR 3 2009
TTHM MR 3 2009
Chromium MR 3 2011
Fluoride MR 3 2011
Mercury MR 3 2011
Barium MR 3 2011
Beryllium, Total MR 3 2002
Revised Total Coliform Rule MON 3 2017
Nickel MR 3 2002
Cadmium MR 3 2011
Selenium MR 3 2011
Asbestos MR 3 2011

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 Sheridan 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 MT0000329 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
2024 Lead and Copper Rule MR 20 SDWIS / MT0000329 / 5000
2017 Revised Total Coliform Rule MON 3 SDWIS / MT0000329 / 8000
2014 Chlorine MR 12 SDWIS / MT0000329 / 0999
2014 Consumer Confidence Rule Other 6 SDWIS / MT0000329 / 7000
2011 Chromium MR 3 SDWIS / MT0000329 / 1020
2011 Fluoride MR 3 SDWIS / MT0000329 / 1025
2011 Mercury MR 3 SDWIS / MT0000329 / 1035
2011 Barium MR 3 SDWIS / MT0000329 / 1010
2011 Cadmium MR 3 SDWIS / MT0000329 / 1015
2011 Selenium MR 3 SDWIS / MT0000329 / 1045
2011 Asbestos MR 3 SDWIS / MT0000329 / 1094
2009 Total Haloacetic Acids (HAA5) MR 3 SDWIS / MT0000329 / 2456
2009 TTHM MR 3 SDWIS / MT0000329 / 2950
2008 Coliform (TCR) MR 31 SDWIS / MT0000329 / 3100
2008 Nitrate-Nitrite MR 6 SDWIS / MT0000329 / 1038

How Sheridan Town Of Compares

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

Metric Sheridan Town Of Montana avg Federal benchmark
Total violations 123 131.4 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 632 492 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 Sheridan Town Of water safe to drink? ▼
Sheridan Town Of (PWS ID: MT0000329) has 123 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 632 people using Groundwater sources.
How many people does Sheridan Town Of serve? ▼
Sheridan Town Of serves 632 people in Sheridan, Montana. It is a Local-owned system using Groundwater water sources with 413 service connections.
What type of violations does Sheridan Town Of have? ▼
Sheridan Town Of has 123 total violations: 0 health-based violations (MCL exceedances or treatment failures), 111 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Sheridan Town Of water? ▼
No PFAS testing data is available for Sheridan Town Of under the EPA's UCMR5 monitoring program.
What water source does Sheridan Town Of use? ▼
Sheridan 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.