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States → Montana

Community Water System · PWS MT0000402

McDonald Trailer CT

East Helena, Montana 59635 - drinking water served from groundwater sources to 75 people, tracked in EPA SDWIS and UCMR5.

75
People served
943
EPA violations
3
Health-based
Untested
UCMR5 result

The verdict

EPA records 943 drinking-water violations at McDonald Trailer CT - above the Montana per-system average.

943
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
75
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: McDonald Trailer CT

McDonald Trailer CT is a private-owned community water system that delivers drinking water to 75 residents in East Helena, Montana (Lewis and Clark County) through 24 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 943 total violations for this system , of which 3 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 886 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 Revised Total Coliform Rule, recorded in 169 violations (MON). 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%).

McDonald Trailer CT's 943 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
75
Total Violations
943
Health-Based Violations
3
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
24
County
Lewis and Clark
School/Daycare
No
MCL Violations
0
Monitoring Violations
886
Treatment Tech Violations
3

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Revised Total Coliform Rule MON 169 2024
Coliform (TCR) MR 114 2015
Consumer Confidence Rule Other 52 2024
Lead and Copper Rule MR 21 2020
Nitrate-Nitrite MR 18 2023
Toluene MR 15 2015
Combined Radium (-226 and -228) MR 14 2017
Endrin MR 12 2014
BHC-GAMMA MR 12 2014
Methoxychlor MR 12 2014
Toxaphene MR 12 2014
Di(2-ethylhexyl) adipate MR 12 2014
OXAMYL MR 12 2014
Di(2-ethylhexyl) phthalate MR 12 2014
Dinoseb MR 12 2014
Hexachlorocyclopentadiene MR 12 2014
Aldicarb sulfoxide MR 12 2014
Aldicarb sulfone MR 12 2014
Carbofuran MR 12 2014
Atrazine MR 12 2014
LASSO MR 12 2014
HEXACHLOROBENZENE MR 12 2014
Chlordane MR 12 2014
Dalapon MR 12 2014
Picloram MR 12 2014
Aldicarb MR 12 2014
Heptachlor MR 12 2014
Heptachlor epoxide MR 12 2014
2,4-D MR 12 2014
2,4,5-TP MR 12 2014

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 McDonald Trailer CT.

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 MT0000402 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 Revised Total Coliform Rule MON 169 SDWIS / MT0000402 / 8000
2024 Consumer Confidence Rule Other 52 SDWIS / MT0000402 / 7000
2023 Nitrate-Nitrite MR 18 SDWIS / MT0000402 / 1038
2021 Revised Total Coliform Rule TT 3 SDWIS / MT0000402 / 8000
2020 Lead and Copper Rule MR 21 SDWIS / MT0000402 / 5000
2020 E. COLI MR 6 SDWIS / MT0000402 / 3014
2017 Combined Radium (-226 and -228) MR 14 SDWIS / MT0000402 / 4010
2015 Coliform (TCR) MR 114 SDWIS / MT0000402 / 3100
2015 Toluene MR 15 SDWIS / MT0000402 / 2991
2015 Gross Alpha, Excl. Radon and U MR 12 SDWIS / MT0000402 / 4000
2015 1,2,4-Trichlorobenzene MR 9 SDWIS / MT0000402 / 2378
2015 Xylenes, Total MR 9 SDWIS / MT0000402 / 2955
2015 DICHLOROMETHANE MR 9 SDWIS / MT0000402 / 2964
2015 p-Dichlorobenzene MR 9 SDWIS / MT0000402 / 2969
2015 Vinyl chloride MR 9 SDWIS / MT0000402 / 2976

How McDonald Trailer CT Compares

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

Metric McDonald Trailer CT Montana avg Federal benchmark
Total violations 943 131.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 3 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 75 492 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 McDonald Trailer CT water safe to drink? ▼
McDonald Trailer CT (PWS ID: MT0000402) has 943 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 75 people using Groundwater sources.
How many people does McDonald Trailer CT serve? ▼
McDonald Trailer CT serves 75 people in East Helena, Montana. It is a Private-owned system using Groundwater water sources with 24 service connections.
What type of violations does McDonald Trailer CT have? ▼
McDonald Trailer CT has 943 total violations: 3 health-based violations (MCL exceedances or treatment failures), 886 monitoring/reporting violations, and 3 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in McDonald Trailer CT water? ▼
No PFAS testing data is available for McDonald Trailer CT under the EPA's UCMR5 monitoring program.
What water source does McDonald Trailer CT use? ▼
McDonald Trailer CT 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.