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Peterborough, NH Tap Water Quality 2026

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

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

Main Utility: Peterborough Water Works PWSID: NH1871010 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 9.00 ppb, 60% of the action level and no violations are open. No PFAS was detected.

A

Peterborough earns an A for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: 9.00 ppb — 60% of the federal action level
PFAS tested, none detected
26 violations since 2015, 0 health-based
No violations currently open
Peterborough's lead level vs. all New Hampshire community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 9.00 ppb — 60% of the federal action level
✓ Lower lead than 72% of New Hampshire utilities
Population Served
5424
~1840 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
26 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
60% of EPA action level
9.00 ppb
Action level: 15 ppb
The 90th-percentile lead result is 9.00 ppb, 60% 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 MONITORING AND REPORTING — 0.080 mg/L 2024 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2024 Resolved
Consumer Confidence Rule OTHER — — 2022 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2019 Resolved
Revised Total Coliform Rule REPORTING FAILURE — — 2019 Resolved
1,2,4-Trichlorobenzene MONITORING AND REPORTING — 0.07 mg/L 2017 Resolved
cis-1,2-Dichloroethylene MONITORING AND REPORTING — 0.07 mg/L 2017 Resolved
Xylenes, Total MONITORING AND REPORTING — 10 mg/L 2017 Resolved
DICHLOROMETHANE MONITORING AND REPORTING — 0.005 mg/L 2017 Resolved
o-Dichlorobenzene MONITORING AND REPORTING — 0.6 mg/L 2017 Resolved
p-Dichlorobenzene MONITORING AND REPORTING — 0.075 mg/L 2017 Resolved
Vinyl chloride MONITORING AND REPORTING — 0.002 mg/L 2017 Resolved
1,1-Dichloroethylene MONITORING AND REPORTING — 0.007 mg/L 2017 Resolved
trans-1,2-Dichloroethylene MONITORING AND REPORTING — 0.1 mg/L 2017 Resolved
1,2-Dichloroethane MONITORING AND REPORTING — 0.005 mg/L 2017 Resolved
1,1,1-Trichloroethane MONITORING AND REPORTING — 0.2 mg/L 2017 Resolved
Carbon tetrachloride MONITORING AND REPORTING — 0.005 mg/L 2017 Resolved
1,2-Dichloropropane MONITORING AND REPORTING — 0.005 mg/L 2017 Resolved
Trichloroethylene MONITORING AND REPORTING — 0.005 mg/L 2017 Resolved
1,1,2-Trichloroethane MONITORING AND REPORTING — 0.005 mg/L 2017 Resolved
Tetrachloroethylene MONITORING AND REPORTING — 0.005 mg/L 2017 Resolved
CHLOROBENZENE MONITORING AND REPORTING — 0.1 mg/L 2017 Resolved
Benzene MONITORING AND REPORTING — 0.005 mg/L 2017 Resolved
Toluene MONITORING AND REPORTING — 1 mg/L 2017 Resolved
Ethylbenzene MONITORING AND REPORTING — 0.7 mg/L 2017 Resolved
Styrene MONITORING AND REPORTING — 0.1 mg/L 2017 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

26 violations are on record since 2015, of which 0 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Peterborough Water Works
PWSID NH1871010
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 5,424
Service connections 1,840
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Peterborough tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 9.00 ppb, 60% of the action level.
Does Peterborough water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Peterborough? ▼
Peterborough Water Works (PWSID NH1871010). Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2024-09-19. No significant deficiencies were recorded.

What Should Peterborough 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.

Nearby Cities in New Hampshire

Manchester, Nh Tap Water Quality 2026 Hillsborough Nashua, Nh Tap Water Quality 2026 Hillsborough Merrimack, Nh Tap Water Quality 2026 Hillsborough Hudson, Nh Tap Water Quality 2026 Hillsborough Milford, Nh Tap Water Quality 2026 Hillsborough Litchfield, Nh Tap Water Quality 2026 Hillsborough