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Community Water System · PWS MT0003043

Mobile City Home Park No 2

Billings, Montana 59102 - drinking water served from groundwater sources to 300 people, tracked in EPA SDWIS and UCMR5.

300
People served
623
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 623 drinking-water violations at Mobile City Home Park No 2 - above the Montana per-system average.

623
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
300
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Mobile City Home Park No 2

Mobile City Home Park No 2 is a private-owned community water system that delivers drinking water to 300 residents in Billings, Montana (Lewis and Clark County) through 153 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 623 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 617 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 Lead and Copper Rule, recorded in 20 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%).

Mobile City Home Park No 2's 623 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
300
Total Violations
623
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
153
County
Lewis and Clark
School/Daycare
No
MCL Violations
0
Monitoring Violations
617
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 20 2007
1,2,4-Trichlorobenzene MR 15 2010
cis-1,2-Dichloroethylene MR 15 2010
Xylenes, Total MR 15 2010
DICHLOROMETHANE MR 15 2010
Vinyl chloride MR 15 2010
1,1-Dichloroethylene MR 15 2010
trans-1,2-Dichloroethylene MR 15 2010
1,2-Dichloroethane MR 15 2010
Tetrachloroethylene MR 15 2010
CHLOROBENZENE MR 15 2010
Styrene MR 15 2010
o-Dichlorobenzene MR 15 2010
1,1,1-Trichloroethane MR 15 2010
Carbon tetrachloride MR 15 2010
1,2-Dichloropropane MR 15 2010
Trichloroethylene MR 15 2010
Toluene MR 15 2010
Benzene MR 15 2010
Ethylbenzene MR 15 2010
p-Dichlorobenzene MR 15 2010
1,1,2-Trichloroethane MR 15 2010
Coliform (TCR) MR 12 1999
Nitrate-Nitrite MR 12 2003
Methoxychlor MR 7 2008
Dalapon MR 7 2008
Di(2-ethylhexyl) adipate MR 7 2008
OXAMYL MR 7 2008
Picloram MR 7 2008
Dinoseb MR 7 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 Mobile City Home Park No 2.

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 MT0003043 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 6 SDWIS / MT0003043 / 8000
2020 Consumer Confidence Rule Other 6 SDWIS / MT0003043 / 7000
2020 E. COLI MR 3 SDWIS / MT0003043 / 3014
2010 1,2,4-Trichlorobenzene MR 15 SDWIS / MT0003043 / 2378
2010 cis-1,2-Dichloroethylene MR 15 SDWIS / MT0003043 / 2380
2010 Xylenes, Total MR 15 SDWIS / MT0003043 / 2955
2010 DICHLOROMETHANE MR 15 SDWIS / MT0003043 / 2964
2010 Vinyl chloride MR 15 SDWIS / MT0003043 / 2976
2010 1,1-Dichloroethylene MR 15 SDWIS / MT0003043 / 2977
2010 trans-1,2-Dichloroethylene MR 15 SDWIS / MT0003043 / 2979
2010 1,2-Dichloroethane MR 15 SDWIS / MT0003043 / 2980
2010 Tetrachloroethylene MR 15 SDWIS / MT0003043 / 2987
2010 CHLOROBENZENE MR 15 SDWIS / MT0003043 / 2989
2010 Styrene MR 15 SDWIS / MT0003043 / 2996
2010 o-Dichlorobenzene MR 15 SDWIS / MT0003043 / 2968

How Mobile City Home Park No 2 Compares

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

Metric Mobile City Home Park No 2 Montana avg Federal benchmark
Total violations 623 131.4 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 300 492 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 Mobile City Home Park No 2 water safe to drink? ▼
Mobile City Home Park No 2 (PWS ID: MT0003043) has 623 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 300 people using Groundwater sources.
How many people does Mobile City Home Park No 2 serve? ▼
Mobile City Home Park No 2 serves 300 people in Billings, Montana. It is a Private-owned system using Groundwater water sources with 153 service connections.
What type of violations does Mobile City Home Park No 2 have? ▼
Mobile City Home Park No 2 has 623 total violations: 0 health-based violations (MCL exceedances or treatment failures), 617 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Mobile City Home Park No 2 water? ▼
No PFAS testing data is available for Mobile City Home Park No 2 under the EPA's UCMR5 monitoring program.
What water source does Mobile City Home Park No 2 use? ▼
Mobile City Home Park No 2 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.