PlainWater
States → Montana

Non-Transient Non-Community Water System · PWS MT0001447

Rossiter School District 01

Helena, Montana 59601 - drinking water served from groundwater sources to 550 people, tracked in EPA SDWIS and UCMR5.

550
People served
175
EPA violations
6
Health-based
Untested
UCMR5 result

The verdict

EPA records 175 drinking-water violations at Rossiter School District 01, 3% of them health-based - above the Montana per-system average.

175
Total EPA violations on record
3%
Health-based (MCL / treatment failure)
550
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Rossiter School District 01

Rossiter School District 01 is a local-owned non-transient non-community water system that delivers drinking water to 550 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 175 total violations for this system , of which 6 (3%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 168 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 Coliform (TCR), recorded in 13 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%).

Rossiter School District 01's 175 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
550
Total Violations
175
Health-Based Violations
6
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
6
Monitoring Violations
168
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 13 2012
Lead and Copper Rule MR 7 2016
Revised Total Coliform Rule MON 7 2018
Coliform (TCR) MCL 6 2001
p-Dichlorobenzene MR 3 2011
Vinyl chloride MR 3 2011
trans-1,2-Dichloroethylene MR 3 2011
1,2-Dichloroethane MR 3 2011
1,2-Dichloropropane MR 3 2011
Trichloroethylene MR 3 2011
1,1,2-Trichloroethane MR 3 2011
Tetrachloroethylene MR 3 2011
CHLOROBENZENE MR 3 2011
Toluene MR 3 2011
Styrene MR 3 2011
Methoxychlor MR 3 2011
Toxaphene MR 3 2011
Di(2-ethylhexyl) phthalate MR 3 2011
Picloram MR 3 2011
Aldicarb MR 3 2011
Atrazine MR 3 2011
LASSO MR 3 2011
Heptachlor epoxide MR 3 2011
HEXACHLOROBENZENE MR 3 2011
Benzo(a)pyrene MR 3 2011
Pentachlorophenol MR 3 2011
OXAMYL MR 3 2011
o-Dichlorobenzene MR 3 2011
Aldicarb sulfone MR 3 2011
BHC-GAMMA MR 3 2011

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 Rossiter School District 01.

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 MT0001447 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 7 SDWIS / MT0001447 / 8000
2016 Lead and Copper Rule MR 7 SDWIS / MT0001447 / 5000
2012 Coliform (TCR) MR 13 SDWIS / MT0001447 / 3100
2011 p-Dichlorobenzene MR 3 SDWIS / MT0001447 / 2969
2011 Vinyl chloride MR 3 SDWIS / MT0001447 / 2976
2011 trans-1,2-Dichloroethylene MR 3 SDWIS / MT0001447 / 2979
2011 1,2-Dichloroethane MR 3 SDWIS / MT0001447 / 2980
2011 1,2-Dichloropropane MR 3 SDWIS / MT0001447 / 2983
2011 Trichloroethylene MR 3 SDWIS / MT0001447 / 2984
2011 1,1,2-Trichloroethane MR 3 SDWIS / MT0001447 / 2985
2011 Tetrachloroethylene MR 3 SDWIS / MT0001447 / 2987
2011 CHLOROBENZENE MR 3 SDWIS / MT0001447 / 2989
2011 Toluene MR 3 SDWIS / MT0001447 / 2991
2011 Styrene MR 3 SDWIS / MT0001447 / 2996
2011 Methoxychlor MR 3 SDWIS / MT0001447 / 2015

How Rossiter School District 01 Compares

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

Metric Rossiter School District 01 Montana avg Federal benchmark
Total violations 175 131.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 6 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 550 492 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 Rossiter School District 01 water safe to drink? ▼
Rossiter School District 01 (PWS ID: MT0001447) has 175 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 550 people using Groundwater sources.
How many people does Rossiter School District 01 serve? ▼
Rossiter School District 01 serves 550 people in Helena, Montana. It is a Local-owned system using Groundwater water sources with 1 service connections.
What type of violations does Rossiter School District 01 have? ▼
Rossiter School District 01 has 175 total violations: 6 health-based violations (MCL exceedances or treatment failures), 168 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Rossiter School District 01 water? ▼
No PFAS testing data is available for Rossiter School District 01 under the EPA's UCMR5 monitoring program.
What water source does Rossiter School District 01 use? ▼
Rossiter School District 01 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.