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States → Montana

Non-Transient Non-Community Water System · PWS MT0003623

Water Resources Division

Missoula, Montana 59804 - drinking water served from groundwater sources to 60 people, tracked in EPA SDWIS and UCMR5.

60
People served
381
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 381 drinking-water violations at Water Resources Division - above the Montana per-system average.

381
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
60
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Water Resources Division

Water Resources Division is a state-owned non-transient non-community water system that delivers drinking water to 60 residents in Missoula, Montana (Missoula County) through 7 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 381 total violations for this system , of which 0 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 379 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 Coliform (TCR), recorded in 40 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, 5 of 45 UCMR5-tested systems have reported PFAS detections (11.1%).

Water Resources Division's 381 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
60
Total Violations
381
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
State
Connections
7
County
Missoula
School/Daycare
No
MCL Violations
0
Monitoring Violations
379
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 40 2013
Nitrate-Nitrite MR 23 2024
Lead and Copper Rule MR 12 2014
TTHM MR 12 2023
Total Haloacetic Acids (HAA5) MR 12 2023
Revised Total Coliform Rule MON 12 2024
Barium MR 8 2008
Chromium MR 8 2008
Fluoride MR 8 2008
Nickel MR 8 2008
Beryllium, Total MR 8 2008
Cadmium MR 8 2008
Mercury MR 8 2008
Selenium MR 8 2008
Thallium, Total MR 8 2008
Antimony, Total MR 8 2008
Aldicarb sulfone MR 6 2008
OXAMYL MR 6 2008
Carbofuran MR 6 2008
Aldicarb MR 6 2008
Aldicarb sulfoxide MR 6 2008
BHC-GAMMA MR 4 2008
Methoxychlor MR 4 2008
Toxaphene MR 4 2008
Dalapon MR 4 2008
Di(2-ethylhexyl) adipate MR 4 2008
Simazine MR 4 2008
Picloram MR 4 2008
LASSO MR 4 2008
Heptachlor MR 4 2008

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 Water Resources Division.

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 MT0003623 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 E. COLI MR 2 SDWIS / MT0003623 / 3014
2024 Nitrate-Nitrite MR 23 SDWIS / MT0003623 / 1038
2024 Revised Total Coliform Rule MON 12 SDWIS / MT0003623 / 8000
2023 TTHM MR 12 SDWIS / MT0003623 / 2950
2023 Total Haloacetic Acids (HAA5) MR 12 SDWIS / MT0003623 / 2456
2020 Asbestos MR 3 SDWIS / MT0003623 / 1094
2014 Lead and Copper Rule MR 12 SDWIS / MT0003623 / 5000
2013 Coliform (TCR) MR 40 SDWIS / MT0003623 / 3100
2012 Chlorine MR 3 SDWIS / MT0003623 / 0999
2008 Barium MR 8 SDWIS / MT0003623 / 1010
2008 Chromium MR 8 SDWIS / MT0003623 / 1020
2008 Fluoride MR 8 SDWIS / MT0003623 / 1025
2008 Nickel MR 8 SDWIS / MT0003623 / 1036
2008 Beryllium, Total MR 8 SDWIS / MT0003623 / 1075
2008 Cadmium MR 8 SDWIS / MT0003623 / 1015

How Water Resources Division Compares

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

Metric Water Resources Division Montana avg Federal benchmark
Total violations 381 131.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 0 11.5 Indicates a contaminant exceeded a federal MCL
PFAS detection None 11.1% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 60 492 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 Water Resources Division water safe to drink? ▼
Water Resources Division (PWS ID: MT0003623) has 381 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 60 people using Groundwater sources.
How many people does Water Resources Division serve? ▼
Water Resources Division serves 60 people in Missoula, Montana. It is a State-owned system using Groundwater water sources with 7 service connections.
What type of violations does Water Resources Division have? ▼
Water Resources Division has 381 total violations: 0 health-based violations (MCL exceedances or treatment failures), 379 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Water Resources Division water? ▼
No PFAS testing data is available for Water Resources Division under the EPA's UCMR5 monitoring program.
What water source does Water Resources Division use? ▼
Water Resources Division 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.