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Community Water System · PWS MT0000426

Helena RV and Mobile Home Park

Hailey, Montana 83333 - drinking water served from groundwater sources to 250 people, tracked in EPA SDWIS and UCMR5.

250
People served
2,806
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 2,806 drinking-water violations at Helena RV and Mobile Home Park - above the Montana per-system average.

2,806
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
250
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Helena RV and Mobile Home Park

Helena RV and Mobile Home Park is a private-owned community water system that delivers drinking water to 250 residents in Hailey, Montana (Lewis and Clark County) through 91 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 2,806 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 2,779 monitoring and reporting violations are on file. The most recent violation on record dates to 2023.

The most frequently cited contaminant at this system is Endrin, recorded in 66 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%).

Helena RV and Mobile Home Park's 2,806 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
250
Total Violations
2,806
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
91
County
Lewis and Clark
School/Daycare
No
MCL Violations
0
Monitoring Violations
2,779
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Endrin MR 66 2020
BHC-GAMMA MR 66 2020
Di(2-ethylhexyl) adipate MR 66 2020
OXAMYL MR 66 2020
Simazine MR 66 2020
Picloram MR 66 2020
Dinoseb MR 66 2020
Hexachlorocyclopentadiene MR 66 2020
Carbofuran MR 66 2020
Atrazine MR 66 2020
LASSO MR 66 2020
Heptachlor epoxide MR 66 2020
2,4-D MR 66 2020
Benzo(a)pyrene MR 66 2020
Pentachlorophenol MR 66 2020
Methoxychlor MR 66 2020
Toxaphene MR 66 2020
Dalapon MR 66 2020
Di(2-ethylhexyl) phthalate MR 66 2020
Heptachlor MR 66 2020
2,4,5-TP MR 66 2020
HEXACHLOROBENZENE MR 66 2020
Chlordane MR 66 2020
1,2,4-Trichlorobenzene MR 57 2020
Xylenes, Total MR 57 2020
o-Dichlorobenzene MR 57 2020
Vinyl chloride MR 57 2020
trans-1,2-Dichloroethylene MR 57 2020
1,2-Dichloroethane MR 57 2020
Carbon tetrachloride MR 57 2020

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 Helena RV and Mobile Home Park.

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 MT0000426 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
2023 TTHM MR 5 SDWIS / MT0000426 / 2950
2023 Total Haloacetic Acids (HAA5) MR 5 SDWIS / MT0000426 / 2456
2021 Consumer Confidence Rule Other 16 SDWIS / MT0000426 / 7000
2020 Endrin MR 66 SDWIS / MT0000426 / 2005
2020 BHC-GAMMA MR 66 SDWIS / MT0000426 / 2010
2020 Di(2-ethylhexyl) adipate MR 66 SDWIS / MT0000426 / 2035
2020 OXAMYL MR 66 SDWIS / MT0000426 / 2036
2020 Simazine MR 66 SDWIS / MT0000426 / 2037
2020 Picloram MR 66 SDWIS / MT0000426 / 2040
2020 Dinoseb MR 66 SDWIS / MT0000426 / 2041
2020 Hexachlorocyclopentadiene MR 66 SDWIS / MT0000426 / 2042
2020 Carbofuran MR 66 SDWIS / MT0000426 / 2046
2020 Atrazine MR 66 SDWIS / MT0000426 / 2050
2020 LASSO MR 66 SDWIS / MT0000426 / 2051
2020 Heptachlor epoxide MR 66 SDWIS / MT0000426 / 2067

How Helena RV and Mobile Home Park Compares

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

Metric Helena RV and Mobile Home Park Montana avg Federal benchmark
Total violations 2,806 131.4 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 62.2% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 250 492 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 Helena RV and Mobile Home Park water safe to drink? ▼
Helena RV and Mobile Home Park (PWS ID: MT0000426) has 2806 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 250 people using Groundwater sources.
How many people does Helena RV and Mobile Home Park serve? ▼
Helena RV and Mobile Home Park serves 250 people in Hailey, Montana. It is a Private-owned system using Groundwater water sources with 91 service connections.
What type of violations does Helena RV and Mobile Home Park have? ▼
Helena RV and Mobile Home Park has 2,806 total violations: 0 health-based violations (MCL exceedances or treatment failures), 2,779 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Helena RV and Mobile Home Park water? ▼
No PFAS testing data is available for Helena RV and Mobile Home Park under the EPA's UCMR5 monitoring program.
What water source does Helena RV and Mobile Home Park use? ▼
Helena RV and Mobile Home Park 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.