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Community Water System · PWS MT0000428

Hysham Town Of

Hysham, Montana 59038 - drinking water served from surface water sources to 262 people, tracked in EPA SDWIS and UCMR5.

262
People served
752
EPA violations
30
Health-based
Untested
UCMR5 result

The verdict

EPA records 752 drinking-water violations at Hysham Town Of, 4% of them health-based - above the Montana per-system average.

752
Total EPA violations on record
4%
Health-based (MCL / treatment failure)
262
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Hysham Town Of

Hysham Town Of is a local-owned community water system that delivers drinking water to 262 residents in Hysham, Montana (Treasure County) through 184 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 752 total violations for this system , of which 30 (4%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 710 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Surface Water Treatment Rule, recorded in 26 violations (TT, 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, 28 of 45 UCMR5-tested systems have reported PFAS detections (62.2%).

Hysham Town Of's 752 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
262
Total Violations
752
Health-Based Violations
30
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
184
County
Treasure
School/Daycare
No
MCL Violations
0
Monitoring Violations
710
Treatment Tech Violations
30

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Surface Water Treatment Rule TT 26 2022
Endrin MR 21 2020
Toxaphene MR 21 2020
Di(2-ethylhexyl) phthalate MR 21 2020
Picloram MR 21 2020
Dinoseb MR 21 2020
Hexachlorocyclopentadiene MR 21 2020
Carbofuran MR 21 2020
Atrazine MR 21 2020
LASSO MR 21 2020
Heptachlor MR 21 2020
2,4,5-TP MR 21 2020
Benzo(a)pyrene MR 21 2020
Chlordane MR 21 2020
BHC-GAMMA MR 21 2020
Dalapon MR 21 2020
OXAMYL MR 21 2020
Heptachlor epoxide MR 21 2020
Simazine MR 21 2020
HEXACHLOROBENZENE MR 21 2020
Di(2-ethylhexyl) adipate MR 21 2020
2,4-D MR 21 2020
Pentachlorophenol MR 21 2020
Methoxychlor MR 21 2020
Arsenic MR 15 2021
Surface Water Treatment Rule MR 12 2025
cis-1,2-Dichloroethylene MR 8 2020
o-Dichlorobenzene MR 8 2020
p-Dichlorobenzene MR 8 2020
Vinyl chloride MR 8 2020

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 Hysham 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 MT0000428 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
2025 Surface Water Treatment Rule MR 12 SDWIS / MT0000428 / 0200
2025 Interim Enhanced Surface Water Treatment Rule TT 4 SDWIS / MT0000428 / 0300
2023 Total Haloacetic Acids (HAA5) MR 3 SDWIS / MT0000428 / 2456
2023 TTHM MR 3 SDWIS / MT0000428 / 2950
2022 Surface Water Treatment Rule TT 26 SDWIS / MT0000428 / 0200
2022 Consumer Confidence Rule Other 6 SDWIS / MT0000428 / 7000
2021 Arsenic MR 15 SDWIS / MT0000428 / 1005
2021 Lead and Copper Rule MR 7 SDWIS / MT0000428 / 5000
2020 Endrin MR 21 SDWIS / MT0000428 / 2005
2020 Toxaphene MR 21 SDWIS / MT0000428 / 2020
2020 Di(2-ethylhexyl) phthalate MR 21 SDWIS / MT0000428 / 2039
2020 Picloram MR 21 SDWIS / MT0000428 / 2040
2020 Dinoseb MR 21 SDWIS / MT0000428 / 2041
2020 Hexachlorocyclopentadiene MR 21 SDWIS / MT0000428 / 2042
2020 Carbofuran MR 21 SDWIS / MT0000428 / 2046

How Hysham Town Of Compares

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

Metric Hysham Town Of Montana avg Federal benchmark
Total violations 752 131.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 30 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 262 492 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 Hysham Town Of water safe to drink? ▼
Hysham Town Of (PWS ID: MT0000428) has 752 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 262 people using Surface Water sources.
How many people does Hysham Town Of serve? ▼
Hysham Town Of serves 262 people in Hysham, Montana. It is a Local-owned system using Surface Water water sources with 184 service connections.
What type of violations does Hysham Town Of have? ▼
Hysham Town Of has 752 total violations: 30 health-based violations (MCL exceedances or treatment failures), 710 monitoring/reporting violations, and 30 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Hysham Town Of water? ▼
No PFAS testing data is available for Hysham Town Of under the EPA's UCMR5 monitoring program.
What water source does Hysham Town Of use? ▼
Hysham 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.