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Non-Transient Non-Community Water System · PWS MT0001735

Pioneer School Dist 41

Billings, Montana 59105 - drinking water served from surface water sources to 70 people, tracked in EPA SDWIS and UCMR5.

70
People served
180
EPA violations
25
Health-based
Untested
UCMR5 result

The verdict

EPA records 180 drinking-water violations at Pioneer School Dist 41, 14% of them health-based - above the Montana per-system average.

180
Total EPA violations on record
14%
Health-based (MCL / treatment failure)
70
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Pioneer School Dist 41

Pioneer School Dist 41 is a state-owned non-transient non-community water system that delivers drinking water to 70 residents in Billings, Montana (Yellowstone County) through 2 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 180 total violations for this system , of which 25 (14%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 155 monitoring and reporting violations are on file. The most recent violation on record dates to 2018.

The most frequently cited contaminant at this system is Lead and Copper Rule, recorded in 129 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%).

Pioneer School Dist 41's 180 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
70
Total Violations
180
Health-Based Violations
25
Water Source
Surface Water

System Details

System Type
Non-Transient Non-Community
Owner Type
State
Connections
2
County
Yellowstone
School/Daycare
Yes
MCL Violations
23
Monitoring Violations
155
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 129 2015
Coliform (TCR) MCL 23 2014
Coliform (TCR) MR 11 2015
Nitrate-Nitrite MR 3 2011
DICHLOROMETHANE MR 3 2011
Nitrate MR 3 1993
E. COLI MR 3 2013
Revised Total Coliform Rule MON 3 2018
Lead and Copper Rule TT 2 1999

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 Pioneer School Dist 41.

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 MT0001735 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
2018 Revised Total Coliform Rule MON 3 SDWIS / MT0001735 / 8000
2015 Lead and Copper Rule MR 129 SDWIS / MT0001735 / 5000
2015 Coliform (TCR) MR 11 SDWIS / MT0001735 / 3100
2014 Coliform (TCR) MCL 23 SDWIS / MT0001735 / 3100
2013 E. COLI MR 3 SDWIS / MT0001735 / 3014
2011 Nitrate-Nitrite MR 3 SDWIS / MT0001735 / 1038
2011 DICHLOROMETHANE MR 3 SDWIS / MT0001735 / 2964
1999 Lead and Copper Rule TT 2 SDWIS / MT0001735 / 5000
1993 Nitrate MR 3 SDWIS / MT0001735 / 1040

How Pioneer School Dist 41 Compares

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

Metric Pioneer School Dist 41 Montana avg Federal benchmark
Total violations 180 131.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 25 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 70 492 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 Pioneer School Dist 41 water safe to drink? ▼
Pioneer School Dist 41 (PWS ID: MT0001735) has 180 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 70 people using Surface Water sources.
How many people does Pioneer School Dist 41 serve? ▼
Pioneer School Dist 41 serves 70 people in Billings, Montana. It is a State-owned system using Surface Water water sources with 2 service connections.
What type of violations does Pioneer School Dist 41 have? ▼
Pioneer School Dist 41 has 180 total violations: 25 health-based violations (MCL exceedances or treatment failures), 155 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Pioneer School Dist 41 water? ▼
No PFAS testing data is available for Pioneer School Dist 41 under the EPA's UCMR5 monitoring program.
What water source does Pioneer School Dist 41 use? ▼
Pioneer School Dist 41 uses Surface Water as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
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.