Community Water System · PWS MT0002669

Loma County Water District

Loma, Montana 59460 - drinking water served from surface water sources to 200 people, tracked in EPA SDWIS and UCMR5.

Compiled by PlainWater Editorial, Drinking Water Quality Editorial Team · May 15, 2026

200
People served: 217
EPA violations: 14
Health-based: Untested
UCMR5 result

The verdict

EPA records 217 drinking-water violations at Loma County Water District, 6% of them health-based - above the Montana per-system average.

217
Total EPA violations on record: 6%
Health-based (MCL / treatment failure): 200
People served by this system: N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Loma County Water District

Loma County Water District is a local-owned community water system that delivers drinking water to 200 residents in Loma, Montana (Chouteau County) through 121 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 217 total violations for this system , of which 14 (6%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 198 monitoring and reporting violations are on file. The most recent violation on record dates to 2014.

The most frequently cited contaminant at this system is Arsenic, recorded in 18 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%).

Loma County Water District's 217 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

200

Total Violations

217

Health-Based Violations

Water Source

Surface Water

System Details

System Type: Community
Owner Type: Local
Connections: 121
County: Chouteau
School/Daycare: No
MCL Violations: 5
Monitoring Violations: 198
Treatment Tech Violations: 9

Violation History

Contaminant violations recorded by EPA.

Contaminant	Category	Count	Latest
Arsenic	MR	18	2001
Surface Water Treatment Rule	MR	15	2010
Thallium, Total	MR	9	2005
Nickel	MR	9	2005
Beryllium, Total	MR	9	2005
Antimony, Total	MR	9	2005
Interim Enhanced Surface Water Treatment Rule	TT	8	2006
Lead and Copper Rule	MR	6	2014
Coliform (TCR)	MCL	5	2001
1,2,4-Trichlorobenzene	MR	4	2001
o-Dichlorobenzene	MR	4	2001
p-Dichlorobenzene	MR	4	2001
Vinyl chloride	MR	4	2001
trans-1,2-Dichloroethylene	MR	4	2001
1,2-Dichloroethane	MR	4	2001
1,2-Dichloropropane	MR	4	2001
Trichloroethylene	MR	4	2001
1,1,2-Trichloroethane	MR	4	2001
CHLOROBENZENE	MR	4	2001
Benzene	MR	4	2001
Toluene	MR	4	2001
Styrene	MR	4	2001
DICHLOROMETHANE	MR	4	2001
cis-1,2-Dichloroethylene	MR	4	2001
Xylenes, Total	MR	4	2001
1,1-Dichloroethylene	MR	4	2001
Tetrachloroethylene	MR	4	2001
Carbon tetrachloride	MR	4	2001
Ethylbenzene	MR	4	2001
1,1,1-Trichloroethane	MR	4	2001

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 Loma County Water District.

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 MT0002669 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
2014	Lead and Copper Rule	MR	6	SDWIS / MT0002669 / 5000
2011	Consumer Confidence Rule	Other	3	SDWIS / MT0002669 / 7000
2010	Surface Water Treatment Rule	MR	15	SDWIS / MT0002669 / 0200
2007	TTHM	MR	1	SDWIS / MT0002669 / 2950
2007	Total Haloacetic Acids (HAA5)	MR	1	SDWIS / MT0002669 / 2456
2006	Interim Enhanced Surface Water Treatment Rule	TT	8	SDWIS / MT0002669 / 0300
2005	Thallium, Total	MR	9	SDWIS / MT0002669 / 1085
2005	Nickel	MR	9	SDWIS / MT0002669 / 1036
2005	Beryllium, Total	MR	9	SDWIS / MT0002669 / 1075
2005	Antimony, Total	MR	9	SDWIS / MT0002669 / 1074
2005	Interim Enhanced Surface Water Treatment Rule	MR	2	SDWIS / MT0002669 / 0300
2004	Dalapon	MR	3	SDWIS / MT0002669 / 2031
2004	Picloram	MR	3	SDWIS / MT0002669 / 2040
2004	Dinoseb	MR	3	SDWIS / MT0002669 / 2041
2004	2,4-D	MR	3	SDWIS / MT0002669 / 2105

How Loma County Water District Compares

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

Metric	Loma County Water District	Montana avg	Federal benchmark
Total violations	217	131.4	SDWA compliance, any non-zero count is a recorded breach
Health-based violations	14	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	200	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 Loma County Water District water safe to drink? ▼

Loma County Water District (PWS ID: MT0002669) has 217 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 200 people using Surface Water sources.

How many people does Loma County Water District serve? ▼

Loma County Water District serves 200 people in Loma, Montana. It is a Local-owned system using Surface Water water sources with 121 service connections.

What type of violations does Loma County Water District have? ▼

Loma County Water District has 217 total violations: 14 health-based violations (MCL exceedances or treatment failures), 198 monitoring/reporting violations, and 9 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Has PFAS been detected in Loma County Water District water? ▼

No PFAS testing data is available for Loma County Water District under the EPA's UCMR5 monitoring program.

What water source does Loma County Water District use? ▼

Loma County Water District uses Surface Water 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.