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States → Montana

Non-Transient Non-Community Water System · PWS MT0004727

City Lights Comm Subdi

East Helena, Montana 59635 - drinking water served from groundwater sources to 55 people, tracked in EPA SDWIS and UCMR5.

55
People served
337
EPA violations
51
Health-based
Untested
UCMR5 result

The verdict

EPA records 337 drinking-water violations at City Lights Comm Subdi, 15% of them health-based - above the Montana per-system average.

337
Total EPA violations on record
15%
Health-based (MCL / treatment failure)
55
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: City Lights Comm Subdi

City Lights Comm Subdi is a private-owned non-transient non-community water system that delivers drinking water to 55 residents in East Helena, Montana (Jefferson County) through 12 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 337 total violations for this system , of which 51 (15%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 286 monitoring and reporting violations are on file. The most recent violation on record dates to 2017.

The most frequently cited contaminant at this system is Arsenic, recorded in 29 violations (MCL, health-based). 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%).

City Lights Comm Subdi's 337 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
55
Total Violations
337
Health-Based Violations
51
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Private
Connections
12
County
Jefferson
School/Daycare
No
MCL Violations
51
Monitoring Violations
286
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Arsenic MCL 29 2015
Arsenic MR 23 2017
Coliform (TCR) MCL 22 2014
OXAMYL MR 10 2012
Heptachlor epoxide MR 10 2012
2,4,5-TP MR 10 2012
HEXACHLOROBENZENE MR 10 2012
Benzo(a)pyrene MR 10 2012
Pentachlorophenol MR 10 2012
Di(2-ethylhexyl) phthalate MR 10 2012
Picloram MR 10 2012
Hexachlorocyclopentadiene MR 10 2012
Carbofuran MR 10 2012
Endrin MR 10 2012
Aldicarb MR 10 2012
Heptachlor MR 10 2012
2,4-D MR 10 2012
BHC-GAMMA MR 10 2012
Chlordane MR 10 2012
Methoxychlor MR 10 2012
Di(2-ethylhexyl) adipate MR 10 2012
Simazine MR 10 2012
Toxaphene MR 10 2012
Dinoseb MR 10 2012
LASSO MR 10 2012
Dalapon MR 10 2012
Atrazine MR 10 2012
Aldicarb sulfoxide MR 10 2012
Aldicarb sulfone MR 10 2012
Nitrate-Nitrite 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 City Lights Comm Subdi.

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 MT0004727 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
2017 Arsenic MR 23 SDWIS / MT0004727 / 1005
2015 Arsenic MCL 29 SDWIS / MT0004727 / 1005
2014 Coliform (TCR) MCL 22 SDWIS / MT0004727 / 3100
2012 OXAMYL MR 10 SDWIS / MT0004727 / 2036
2012 Heptachlor epoxide MR 10 SDWIS / MT0004727 / 2067
2012 2,4,5-TP MR 10 SDWIS / MT0004727 / 2110
2012 HEXACHLOROBENZENE MR 10 SDWIS / MT0004727 / 2274
2012 Benzo(a)pyrene MR 10 SDWIS / MT0004727 / 2306
2012 Pentachlorophenol MR 10 SDWIS / MT0004727 / 2326
2012 Di(2-ethylhexyl) phthalate MR 10 SDWIS / MT0004727 / 2039
2012 Picloram MR 10 SDWIS / MT0004727 / 2040
2012 Hexachlorocyclopentadiene MR 10 SDWIS / MT0004727 / 2042
2012 Carbofuran MR 10 SDWIS / MT0004727 / 2046
2012 Endrin MR 10 SDWIS / MT0004727 / 2005
2012 Aldicarb MR 10 SDWIS / MT0004727 / 2047

How City Lights Comm Subdi Compares

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

Metric City Lights Comm Subdi Montana avg Federal benchmark
Total violations 337 131.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 51 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 55 492 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 City Lights Comm Subdi water safe to drink? ▼
City Lights Comm Subdi (PWS ID: MT0004727) has 337 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 55 people using Groundwater sources.
How many people does City Lights Comm Subdi serve? ▼
City Lights Comm Subdi serves 55 people in East Helena, Montana. It is a Private-owned system using Groundwater water sources with 12 service connections.
What type of violations does City Lights Comm Subdi have? ▼
City Lights Comm Subdi has 337 total violations: 51 health-based violations (MCL exceedances or treatment failures), 286 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in City Lights Comm Subdi water? ▼
No PFAS testing data is available for City Lights Comm Subdi under the EPA's UCMR5 monitoring program.
What water source does City Lights Comm Subdi use? ▼
City Lights Comm Subdi 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.