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Colebrook, NH Tap Water Quality 2026

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

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

Main Utility: Colebrook Water Works PWSID: NH0481010 Updated: 2026 Q2
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Lead above the federal action level

Lead is 31.00 ppb, 207% of the action level and no violations are open. PFAS has never been sampled at this system.

C

Colebrook earns a C for water quality

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

Lead: 31.00 ppb — 207% of the federal action level
PFAS never sampled at this system
14 violations since 2015, 2 health-based
No violations currently open
Colebrook's lead level vs. all New Hampshire community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 31.00 ppb — 100% of the federal action level
✓ Lower lead than 35% of New Hampshire utilities
Population Served
1305
~523 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
14 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
100% of EPA action level
31.00 ppb
Action level: 15 ppb
The 90th-percentile lead result is 31.00 ppb, 207% 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
Revised Total Coliform Rule REPORTING FAILURE — — 2025 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2025 Resolved
E. COLI MONITORING AND REPORTING — 0 2022 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2021 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2021 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2016 Resolved
Arsenic MCL EXCEEDANCE 0.044 MG/L 0.010 mg/L 2016 Resolved
Public Notice OTHER — — 2015 Resolved
Public Notice OTHER — — 2015 Unaddressed
Public Notice OTHER — — 2015 Unaddressed
Chlorine MONITORING AND REPORTING — 4.0 mg/L 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
Coliform (TCR) MCL EXCEEDANCE — 5% of samples 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

14 violations are on record since 2015, of which 2 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Colebrook Water Works
PWSID NH0481010
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 1,305
Service connections 523
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Colebrook tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 31.00 ppb, 207% of the action level.
Does Colebrook 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 Colebrook? ▼
Colebrook Water Works (PWSID NH0481010). Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2023-06-29. No significant deficiencies were recorded.

What Should Colebrook Residents Do?

1
Consider a filter certified for lead
Look for NSF/ANSI 53 certification for lead reduction.
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
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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