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Non-Transient Non-Community Water System · PWS MT0001459

Warren School District No 1

Helena, Montana 59601 - drinking water served from groundwater sources to 350 people, tracked in EPA SDWIS and UCMR5.

350
People served
321
EPA violations
7
Health-based
Untested
UCMR5 result

The verdict

EPA records 321 drinking-water violations at Warren School District No 1, 2% of them health-based - above the Montana per-system average.

321
Total EPA violations on record
2%
Health-based (MCL / treatment failure)
350
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Warren School District No 1

Warren School District No 1 is a local-owned non-transient non-community water system that delivers drinking water to 350 residents in Helena, Montana (Lewis and Clark County) through 1 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 321 total violations for this system , of which 7 (2%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 314 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 16 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%).

Warren School District No 1's 321 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
350
Total Violations
321
Health-Based Violations
7
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Local
Connections
1
County
Lewis and Clark
School/Daycare
Yes
MCL Violations
0
Monitoring Violations
314
Treatment Tech Violations
7

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 16 2012
Lead and Copper Rule MR 12 2017
Toxaphene MR 7 2013
OXAMYL MR 7 2013
Di(2-ethylhexyl) phthalate MR 7 2013
Dinoseb MR 7 2013
Hexachlorocyclopentadiene MR 7 2013
Carbofuran MR 7 2013
Atrazine MR 7 2013
LASSO MR 7 2013
2,4-D MR 7 2013
HEXACHLOROBENZENE MR 7 2013
Chlordane MR 7 2013
Endrin MR 7 2013
Methoxychlor MR 7 2013
Dalapon MR 7 2013
Simazine MR 7 2013
Picloram MR 7 2013
Aldicarb sulfoxide MR 7 2013
Aldicarb sulfone MR 7 2013
Aldicarb MR 7 2013
Heptachlor MR 7 2013
Heptachlor epoxide MR 7 2013
2,4,5-TP MR 7 2013
Revised Total Coliform Rule MON 7 2018
Groundwater Rule MR 7 2017
Groundwater Rule TT 7 2024
BHC-GAMMA MR 7 2013
Di(2-ethylhexyl) adipate MR 7 2013
Pentachlorophenol MR 7 2013

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 Warren School District No 1.

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 MT0001459 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 Groundwater Rule TT 7 SDWIS / MT0001459 / 0700
2018 Revised Total Coliform Rule MON 7 SDWIS / MT0001459 / 8000
2017 Lead and Copper Rule MR 12 SDWIS / MT0001459 / 5000
2017 Groundwater Rule MR 7 SDWIS / MT0001459 / 0700
2017 TTHM MR 3 SDWIS / MT0001459 / 2950
2017 Total Haloacetic Acids (HAA5) MR 3 SDWIS / MT0001459 / 2456
2014 1,2,4-Trichlorobenzene MR 4 SDWIS / MT0001459 / 2378
2014 DICHLOROMETHANE MR 4 SDWIS / MT0001459 / 2964
2014 Vinyl chloride MR 4 SDWIS / MT0001459 / 2976
2014 1,2-Dichloroethane MR 4 SDWIS / MT0001459 / 2980
2014 Carbon tetrachloride MR 4 SDWIS / MT0001459 / 2982
2014 Trichloroethylene MR 4 SDWIS / MT0001459 / 2984
2014 Tetrachloroethylene MR 4 SDWIS / MT0001459 / 2987
2014 Benzene MR 4 SDWIS / MT0001459 / 2990
2014 Ethylbenzene MR 4 SDWIS / MT0001459 / 2992

How Warren School District No 1 Compares

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

Metric Warren School District No 1 Montana avg Federal benchmark
Total violations 321 131.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 7 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 350 492 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 Warren School District No 1 water safe to drink? ▼
Warren School District No 1 (PWS ID: MT0001459) has 321 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 350 people using Groundwater sources.
How many people does Warren School District No 1 serve? ▼
Warren School District No 1 serves 350 people in Helena, Montana. It is a Local-owned system using Groundwater water sources with 1 service connections.
What type of violations does Warren School District No 1 have? ▼
Warren School District No 1 has 321 total violations: 7 health-based violations (MCL exceedances or treatment failures), 314 monitoring/reporting violations, and 7 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Warren School District No 1 water? ▼
No PFAS testing data is available for Warren School District No 1 under the EPA's UCMR5 monitoring program.
What water source does Warren School District No 1 use? ▼
Warren School District No 1 uses Groundwater 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.