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Community Water System · PWS MT0001771

North Harlem Colony

Harlem, Montana 59526 - drinking water served from groundwater sources to 42 people, tracked in EPA SDWIS and UCMR5.

42
People served
132
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 132 drinking-water violations at North Harlem Colony - above the Montana per-system average.

132
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
42
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: North Harlem Colony

North Harlem Colony is a private-owned community water system that delivers drinking water to 42 residents in Harlem, Montana (Blaine County) through 6 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 132 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 127 monitoring and reporting violations are on file. The most recent violation on record dates to 2015.

The most frequently cited contaminant at this system is Lead and Copper Rule, recorded in 14 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, 5 of 45 UCMR5-tested systems have reported PFAS detections (11.1%).

North Harlem Colony's 132 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
42
Total Violations
132
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
6
County
Blaine
School/Daycare
No
MCL Violations
0
Monitoring Violations
127
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 14 2015
Arsenic MR 5 1999
Nickel MR 4 1999
Thallium, Total MR 4 1999
Nitrate-Nitrite MR 4 2001
Beryllium, Total MR 4 1999
Antimony, Total MR 4 1999
Dalapon MR 3 2002
Picloram MR 3 2002
Dinoseb MR 3 2002
2,4-D MR 3 2002
2,4,5-TP MR 3 2002
Pentachlorophenol MR 3 2002
1,2,4-Trichlorobenzene MR 3 2002
p-Dichlorobenzene MR 3 2002
Vinyl chloride MR 3 2002
1,1-Dichloroethylene MR 3 2002
trans-1,2-Dichloroethylene MR 3 2002
Carbon tetrachloride MR 3 2002
1,2-Dichloropropane MR 3 2002
Trichloroethylene MR 3 2002
Tetrachloroethylene MR 3 2002
Benzene MR 3 2002
Toluene MR 3 2002
Consumer Confidence Rule Other 3 2008
1,1,2-Trichloroethane MR 3 2002
Styrene MR 3 2002
o-Dichlorobenzene MR 3 2002
1,1,1-Trichloroethane MR 3 2002
Xylenes, Total MR 3 2002

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 North Harlem Colony.

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 MT0001771 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
2015 Lead and Copper Rule MR 14 SDWIS / MT0001771 / 5000
2008 Consumer Confidence Rule Other 3 SDWIS / MT0001771 / 7000
2002 Dalapon MR 3 SDWIS / MT0001771 / 2031
2002 Picloram MR 3 SDWIS / MT0001771 / 2040
2002 Dinoseb MR 3 SDWIS / MT0001771 / 2041
2002 2,4-D MR 3 SDWIS / MT0001771 / 2105
2002 2,4,5-TP MR 3 SDWIS / MT0001771 / 2110
2002 Pentachlorophenol MR 3 SDWIS / MT0001771 / 2326
2002 1,2,4-Trichlorobenzene MR 3 SDWIS / MT0001771 / 2378
2002 p-Dichlorobenzene MR 3 SDWIS / MT0001771 / 2969
2002 Vinyl chloride MR 3 SDWIS / MT0001771 / 2976
2002 1,1-Dichloroethylene MR 3 SDWIS / MT0001771 / 2977
2002 trans-1,2-Dichloroethylene MR 3 SDWIS / MT0001771 / 2979
2002 Carbon tetrachloride MR 3 SDWIS / MT0001771 / 2982
2002 1,2-Dichloropropane MR 3 SDWIS / MT0001771 / 2983

How North Harlem Colony Compares

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

Metric North Harlem Colony Montana avg Federal benchmark
Total violations 132 131.4 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 11.1% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 42 492 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 North Harlem Colony water safe to drink? ▼
North Harlem Colony (PWS ID: MT0001771) has 132 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 42 people using Groundwater sources.
How many people does North Harlem Colony serve? ▼
North Harlem Colony serves 42 people in Harlem, Montana. It is a Private-owned system using Groundwater water sources with 6 service connections.
What type of violations does North Harlem Colony have? ▼
North Harlem Colony has 132 total violations: 0 health-based violations (MCL exceedances or treatment failures), 127 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in North Harlem Colony water? ▼
No PFAS testing data is available for North Harlem Colony under the EPA's UCMR5 monitoring program.
What water source does North Harlem Colony use? ▼
North Harlem Colony 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.