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Community Water System · PWS MT0000018

St Labre Indian School

Ashland, Montana 59003 - drinking water served from groundwater sources to 650 people, tracked in EPA SDWIS and UCMR5.

650
People served
1,488
EPA violations
201
Health-based
Untested
UCMR5 result

The verdict

EPA records 1,488 drinking-water violations at St Labre Indian School, 14% of them health-based - above the Montana per-system average.

1,488
Total EPA violations on record
14%
Health-based (MCL / treatment failure)
650
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: St Labre Indian School

St Labre Indian School is a private-owned community water system that delivers drinking water to 650 residents in Ashland, Montana (Rosebud County) through 98 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 1,488 total violations for this system , of which 201 (14%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 1,243 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 TTHM, recorded in 142 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, 28 of 45 UCMR5-tested systems have reported PFAS detections (62.2%).

St Labre Indian School's 1,488 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
650
Total Violations
1,488
Health-Based Violations
201
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
98
County
Rosebud
School/Daycare
Yes
MCL Violations
149
Monitoring Violations
1,243
Treatment Tech Violations
52

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MCL 142 2025
Groundwater Rule TT 52 2019
Consumer Confidence Rule Other 43 2023
Total Haloacetic Acids (HAA5) MR 26 2025
TTHM MR 26 2025
Di(2-ethylhexyl) phthalate MR 24 2020
Di(2-ethylhexyl) adipate MR 23 2020
Benzo(a)pyrene MR 23 2020
Simazine MR 23 2020
OXAMYL MR 23 2020
Dinoseb MR 23 2020
Dalapon MR 23 2020
Heptachlor epoxide MR 23 2020
Heptachlor MR 23 2020
Toxaphene MR 23 2020
BHC-GAMMA MR 23 2020
cis-1,2-Dichloroethylene MR 23 2020
Vinyl chloride MR 23 2020
1,1-Dichloroethylene MR 23 2020
1,1,1-Trichloroethane MR 23 2020
Carbon tetrachloride MR 23 2020
1,1,2-Trichloroethane MR 23 2020
Tetrachloroethylene MR 23 2020
Toluene MR 23 2020
Endrin MR 23 2020
Methoxychlor MR 23 2020
Atrazine MR 23 2020
LASSO MR 23 2020
2,4-D MR 23 2020
Chlordane MR 23 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 St Labre Indian School.

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 MT0000018 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 TTHM MCL 142 SDWIS / MT0000018 / 2950
2025 Total Haloacetic Acids (HAA5) MR 26 SDWIS / MT0000018 / 2456
2025 TTHM MR 26 SDWIS / MT0000018 / 2950
2024 Nitrate-Nitrite MR 18 SDWIS / MT0000018 / 1038
2023 Consumer Confidence Rule Other 43 SDWIS / MT0000018 / 7000
2021 Lead and Copper Rule MR 22 SDWIS / MT0000018 / 5000
2020 Di(2-ethylhexyl) phthalate MR 24 SDWIS / MT0000018 / 2039
2020 Di(2-ethylhexyl) adipate MR 23 SDWIS / MT0000018 / 2035
2020 Benzo(a)pyrene MR 23 SDWIS / MT0000018 / 2306
2020 Simazine MR 23 SDWIS / MT0000018 / 2037
2020 OXAMYL MR 23 SDWIS / MT0000018 / 2036
2020 Dinoseb MR 23 SDWIS / MT0000018 / 2041
2020 Dalapon MR 23 SDWIS / MT0000018 / 2031
2020 Heptachlor epoxide MR 23 SDWIS / MT0000018 / 2067
2020 Heptachlor MR 23 SDWIS / MT0000018 / 2065

How St Labre Indian School Compares

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

Metric St Labre Indian School Montana avg Federal benchmark
Total violations 1,488 131.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 201 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 650 492 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 St Labre Indian School water safe to drink? ▼
St Labre Indian School (PWS ID: MT0000018) has 1488 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 650 people using Groundwater sources.
How many people does St Labre Indian School serve? ▼
St Labre Indian School serves 650 people in Ashland, Montana. It is a Private-owned system using Groundwater water sources with 98 service connections.
What type of violations does St Labre Indian School have? ▼
St Labre Indian School has 1,488 total violations: 201 health-based violations (MCL exceedances or treatment failures), 1,243 monitoring/reporting violations, and 52 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in St Labre Indian School water? ▼
No PFAS testing data is available for St Labre Indian School under the EPA's UCMR5 monitoring program.
What water source does St Labre Indian School use? ▼
St Labre Indian School 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.