States ›Montana ›Blaine County ›Harlem

Harlem, MT Tap Water Quality 2026

Water quality report for Harlem, MT — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Harlem's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Harlem City Of PWSID: MT0000239 Updated: 2026 Q2
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1 violation currently open

Lead is 1.00 ppb, 7% of the action level. PFAS has never been sampled at this system.

D

Harlem earns a D for water quality

Graded on violations and lead, with state inspection findings. PFAS not tested.

Lead: 1.00 ppb — 7% of the federal action level
PFAS never sampled at this system
123 violations since 2015, 48 health-based
1 violation currently open
Harlem's lead level vs. all Montana community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 1.00 ppb — 7% of the federal action level
✓ Lower lead than 99% of Montana utilities
Population Served
769
~375 connections
Water Source
Surface water
Drawn from surface water — SDWIS source code SW
Active Violations
1
1 open of 123 since 2015

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
7% of EPA action level
1.00 ppb
Action level: 15 ppb
The 90th-percentile lead result is 1.00 ppb, 7% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
TTHM MCL EXCEEDANCE 0.131 MG/L 0.080 mg/L 2026 Archived
Consumer Confidence Rule OTHER — — 2025 Resolved
TTHM MCL EXCEEDANCE 0.145 MG/L 0.080 mg/L 2025 Archived
Revised Total Coliform Rule TREATMENT TECHNIQUE — — 2025 Unaddressed
TTHM MCL EXCEEDANCE 0.156 MG/L 0.080 mg/L 2025 Archived
TTHM MONITORING AND REPORTING — 0.080 mg/L 2025 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2025 Resolved
TTHM MCL EXCEEDANCE 0.158 MG/L 0.080 mg/L 2025 Archived
Revised Total Coliform Rule MONITORING FAILURE — — 2024 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2024 Unaddressed
TTHM MCL EXCEEDANCE 0.141 MG/L 0.080 mg/L 2024 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.063 MG/L 0.060 mg/L 2024 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2024 Resolved
TTHM MCL EXCEEDANCE 120 UG/L 0.080 mg/L 2024 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 62 UG/L 0.060 mg/L 2024 Archived
TTHM MCL EXCEEDANCE 0.113 MG/L 0.080 mg/L 2024 Archived
TTHM MCL EXCEEDANCE 0.096 MG/L 0.080 mg/L 2024 Archived
TTHM MCL EXCEEDANCE 0.098 MG/L 0.080 mg/L 2023 Archived
TTHM MCL EXCEEDANCE 0.105 MG/L 0.080 mg/L 2023 Archived
TTHM MCL EXCEEDANCE 0.109 MG/L 0.080 mg/L 2023 Archived
TTHM MCL EXCEEDANCE 0.109 MG/L 0.080 mg/L 2023 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2022 Resolved
TTHM MCL EXCEEDANCE 0.107 MG/L 0.080 mg/L 2022 Archived
Consumer Confidence Rule OTHER — — 2022 Resolved
TTHM MCL EXCEEDANCE 0.111 MG/L 0.080 mg/L 2022 Archived
TTHM MCL EXCEEDANCE 0.12 MG/L 0.080 mg/L 2022 Archived
TTHM MCL EXCEEDANCE 0.12 MG/L 0.080 mg/L 2022 Archived
1,2,4-Trichlorobenzene MONITORING AND REPORTING — 0.07 mg/L 2022 Resolved
cis-1,2-Dichloroethylene MONITORING AND REPORTING — 0.07 mg/L 2022 Resolved
Xylenes, Total MONITORING AND REPORTING — 10 mg/L 2022 Resolved
DICHLOROMETHANE MONITORING AND REPORTING — 0.005 mg/L 2022 Resolved
o-Dichlorobenzene MONITORING AND REPORTING — 0.6 mg/L 2022 Resolved
p-Dichlorobenzene MONITORING AND REPORTING — 0.075 mg/L 2022 Resolved
Vinyl chloride MONITORING AND REPORTING — 0.002 mg/L 2022 Resolved
1,1-Dichloroethylene MONITORING AND REPORTING — 0.007 mg/L 2022 Resolved
trans-1,2-Dichloroethylene MONITORING AND REPORTING — 0.1 mg/L 2022 Resolved
1,2-Dichloroethane MONITORING AND REPORTING — 0.005 mg/L 2022 Resolved
1,1,1-Trichloroethane MONITORING AND REPORTING — 0.2 mg/L 2022 Resolved
Carbon tetrachloride MONITORING AND REPORTING — 0.005 mg/L 2022 Resolved
1,2-Dichloropropane MONITORING AND REPORTING — 0.005 mg/L 2022 Resolved
Trichloroethylene MONITORING AND REPORTING — 0.005 mg/L 2022 Resolved
1,1,2-Trichloroethane MONITORING AND REPORTING — 0.005 mg/L 2022 Resolved
Tetrachloroethylene MONITORING AND REPORTING — 0.005 mg/L 2022 Resolved
CHLOROBENZENE MONITORING AND REPORTING — 0.1 mg/L 2022 Resolved
Benzene MONITORING AND REPORTING — 0.005 mg/L 2022 Resolved
Toluene MONITORING AND REPORTING — 1 mg/L 2022 Resolved
Ethylbenzene MONITORING AND REPORTING — 0.7 mg/L 2022 Resolved
Styrene MONITORING AND REPORTING — 0.1 mg/L 2022 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2021 Resolved
Consumer Confidence Rule OTHER — — 2021 Resolved
TTHM MCL EXCEEDANCE 103 UG/L 0.080 mg/L 2021 Archived
Consumer Confidence Rule OTHER — — 2021 Resolved
TTHM MCL EXCEEDANCE 137 UG/L 0.080 mg/L 2021 Archived
TTHM MCL EXCEEDANCE 145 UG/L 0.080 mg/L 2021 Archived
TTHM MCL EXCEEDANCE 160 UG/L 0.080 mg/L 2021 Archived
1,2,4-Trichlorobenzene MONITORING AND REPORTING — 0.07 mg/L 2021 Resolved
cis-1,2-Dichloroethylene MONITORING AND REPORTING — 0.07 mg/L 2021 Resolved
Xylenes, Total MONITORING AND REPORTING — 10 mg/L 2021 Resolved
DICHLOROMETHANE MONITORING AND REPORTING — 0.005 mg/L 2021 Resolved
o-Dichlorobenzene MONITORING AND REPORTING — 0.6 mg/L 2021 Resolved
p-Dichlorobenzene MONITORING AND REPORTING — 0.075 mg/L 2021 Resolved
Vinyl chloride MONITORING AND REPORTING — 0.002 mg/L 2021 Resolved
1,1-Dichloroethylene MONITORING AND REPORTING — 0.007 mg/L 2021 Resolved
trans-1,2-Dichloroethylene MONITORING AND REPORTING — 0.1 mg/L 2021 Resolved
1,2-Dichloroethane MONITORING AND REPORTING — 0.005 mg/L 2021 Resolved
1,1,1-Trichloroethane MONITORING AND REPORTING — 0.2 mg/L 2021 Resolved
Carbon tetrachloride MONITORING AND REPORTING — 0.005 mg/L 2021 Resolved
1,2-Dichloropropane MONITORING AND REPORTING — 0.005 mg/L 2021 Resolved
Trichloroethylene MONITORING AND REPORTING — 0.005 mg/L 2021 Resolved
1,1,2-Trichloroethane MONITORING AND REPORTING — 0.005 mg/L 2021 Resolved
Tetrachloroethylene MONITORING AND REPORTING — 0.005 mg/L 2021 Resolved
CHLOROBENZENE MONITORING AND REPORTING — 0.1 mg/L 2021 Resolved
Benzene MONITORING AND REPORTING — 0.005 mg/L 2021 Resolved
Toluene MONITORING AND REPORTING — 1 mg/L 2021 Resolved
Ethylbenzene MONITORING AND REPORTING — 0.7 mg/L 2021 Resolved
Styrene MONITORING AND REPORTING — 0.1 mg/L 2021 Resolved
TTHM MCL EXCEEDANCE 167 UG/L 0.080 mg/L 2020 Archived
Revised Total Coliform Rule MONITORING FAILURE — — 2020 Resolved
TTHM MCL EXCEEDANCE 156 UG/L 0.080 mg/L 2020 Archived
TTHM MCL EXCEEDANCE 147 UG/L 0.080 mg/L 2020 Archived
TTHM MCL EXCEEDANCE 139 UG/L 0.080 mg/L 2020 Archived
Consumer Confidence Rule OTHER — — 2019 Resolved
TTHM MCL EXCEEDANCE 130 UG/L 0.080 mg/L 2019 Archived
Consumer Confidence Rule OTHER — — 2019 Resolved
TTHM MCL EXCEEDANCE 129.3 UG/L 0.080 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 122.8 UG/L 0.080 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 120.3 UG/L 0.080 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 113 UG/L 0.080 mg/L 2018 Archived
TTHM MCL EXCEEDANCE 103.5 UG/L 0.080 mg/L 2018 Archived
TTHM MCL EXCEEDANCE 95.5 UG/L 0.080 mg/L 2018 Archived
TTHM MCL EXCEEDANCE 88.8 UG/L 0.080 mg/L 2018 Archived
Consumer Confidence Rule OTHER — — 2017 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2017 Resolved
TTHM MCL EXCEEDANCE 95.8 UG/L 0.080 mg/L 2017 Archived
Revised Total Coliform Rule MONITORING FAILURE — — 2017 Resolved
Consumer Confidence Rule OTHER — — 2017 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2017 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2017 Resolved
TTHM MCL EXCEEDANCE 80.5 UG/L 0.080 mg/L 2017 Archived
Revised Total Coliform Rule MONITORING FAILURE — — 2017 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2017 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2017 Resolved
TTHM MCL EXCEEDANCE 80.5 UG/L 0.080 mg/L 2017 Archived
TTHM MCL EXCEEDANCE 80.5 UG/L 0.080 mg/L 2017 Archived
TTHM MONITORING AND REPORTING — 0.080 mg/L 2016 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2016 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2016 Resolved
TTHM MCL EXCEEDANCE 94.5 UG/L 0.080 mg/L 2016 Archived
TTHM MCL EXCEEDANCE 106 UG/L 0.080 mg/L 2016 Archived
TTHM MCL EXCEEDANCE 106.8 UG/L 0.080 mg/L 2016 Archived
Coliform (TCR) MONITORING AND REPORTING — 5% of samples 2016 Resolved
Nitrate-Nitrite MONITORING AND REPORTING — — 2016 Resolved
Arsenic MONITORING AND REPORTING — 0.010 mg/L 2016 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2015 Resolved
Consumer Confidence Rule OTHER — — 2015 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2015 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2015 Resolved
Consumer Confidence Rule OTHER — — 2015 Resolved
TTHM MCL EXCEEDANCE 114.8 UG/L 0.080 mg/L 2015 Archived
TTHM MCL EXCEEDANCE 113.5 UG/L 0.080 mg/L 2015 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 76 UG/L 0.060 mg/L 2015 Resolved
TTHM MCL EXCEEDANCE 0.1138 MG/L 0.080 mg/L 2015 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.0848 MG/L 0.060 mg/L 2015 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

1 violation remains open, out of 123 recorded since 2015 (48 health-based).

About the Main Water System

Utility Harlem City Of
PWSID MT0000239
Water source Surface water — Drawn from surface water — SDWIS source code SW
Population served 769
Service connections 375
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Harlem tap water safe to drink? ▼
No federal limit is exceeded on record. 1 violation(s) remain open. Lead is 1.00 ppb, 7% of the action level.
Does Harlem water have PFAS? ▼
This system has never been sampled for PFAS. EPA's national monitoring covered systems serving 3,300 people or more, so no results exist — which is not evidence that none is present.
Who supplies water to Harlem? ▼
Harlem City Of (PWSID MT0000239). Surface water. Drawn from surface water — SDWIS source code SW
When was this system last inspected? ▼
It was last inspected on 2023-11-14. No significant deficiencies were recorded.

What Should Harlem Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Follow the open violation
This system has an unresolved violation. Contact the supplier for its corrective-action schedule.

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