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Community Water System · PWS MT0000254

Huntley Yellowstone Co Water and Sewer

Huntley, Montana 59037 - drinking water served from groundwater sources to 230 people, tracked in EPA SDWIS and UCMR5.

230
People served
51
EPA violations
4
Health-based
Untested
UCMR5 result

The verdict

EPA records 51 drinking-water violations at Huntley Yellowstone Co Water and Sewer, 8% of them health-based - below the Montana per-system average.

51
Total EPA violations on record
8%
Health-based (MCL / treatment failure)
230
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Huntley Yellowstone Co Water and Sewer

Huntley Yellowstone Co Water and Sewer is a local-owned community water system that delivers drinking water to 230 residents in Huntley, Montana (Yellowstone County) through 150 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 51 total violations for this system , of which 4 (8%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 37 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 Nitrate-Nitrite, recorded in 12 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%).

Huntley Yellowstone Co Water and Sewer's 51 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
230
Total Violations
51
Health-Based Violations
4
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
150
County
Yellowstone
School/Daycare
No
MCL Violations
1
Monitoring Violations
37
Treatment Tech Violations
3

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Nitrate-Nitrite MR 12 2017
TTHM MR 9 2006
Total Haloacetic Acids (HAA5) MR 9 2006
Consumer Confidence Rule Other 6 2013
Asbestos MR 5 2020
Revised Total Coliform Rule Other 4 2016
Lead and Copper Rule TT 3 2017
Lead and Copper Rule MR 2 2014
Coliform (TCR) MCL 1 1996

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 Huntley Yellowstone Co Water and Sewer.

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 MT0000254 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 Asbestos MR 5 SDWIS / MT0000254 / 1094
2017 Nitrate-Nitrite MR 12 SDWIS / MT0000254 / 1038
2017 Lead and Copper Rule TT 3 SDWIS / MT0000254 / 5000
2016 Revised Total Coliform Rule Other 4 SDWIS / MT0000254 / 8000
2014 Lead and Copper Rule MR 2 SDWIS / MT0000254 / 5000
2013 Consumer Confidence Rule Other 6 SDWIS / MT0000254 / 7000
2006 TTHM MR 9 SDWIS / MT0000254 / 2950
2006 Total Haloacetic Acids (HAA5) MR 9 SDWIS / MT0000254 / 2456
1996 Coliform (TCR) MCL 1 SDWIS / MT0000254 / 3100

How Huntley Yellowstone Co Water and Sewer Compares

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

Metric Huntley Yellowstone Co Water and Sewer Montana avg Federal benchmark
Total violations 51 131.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 4 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 230 492 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 Huntley Yellowstone Co Water and Sewer water safe to drink? ▼
Huntley Yellowstone Co Water and Sewer (PWS ID: MT0000254) has 51 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 230 people using Groundwater sources.
How many people does Huntley Yellowstone Co Water and Sewer serve? ▼
Huntley Yellowstone Co Water and Sewer serves 230 people in Huntley, Montana. It is a Local-owned system using Groundwater water sources with 150 service connections.
What type of violations does Huntley Yellowstone Co Water and Sewer have? ▼
Huntley Yellowstone Co Water and Sewer has 51 total violations: 4 health-based violations (MCL exceedances or treatment failures), 37 monitoring/reporting violations, and 3 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Huntley Yellowstone Co Water and Sewer water? ▼
No PFAS testing data is available for Huntley Yellowstone Co Water and Sewer under the EPA's UCMR5 monitoring program.
What water source does Huntley Yellowstone Co Water and Sewer use? ▼
Huntley Yellowstone Co Water and Sewer 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.