States ›New Hampshire ›Merrimack County ›Northfield

Northfield, NH Tap Water Quality 2026

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

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

Main Utility: Tilton Northfield Water Dist PWSID: NH2351010 Updated: 2026 Q2
🚨

Lead above the federal action level

Lead is 36.00 ppb, 240% of the action level and no violations are open. PFAS has never been sampled at this system.

C

Northfield earns a C for water quality

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

Lead: 36.00 ppb — 240% of the federal action level
PFAS never sampled at this system
5 violations since 2015, 0 health-based
No violations currently open
Northfield's lead level vs. all New Hampshire community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 36.00 ppb — 100% of the federal action level
✓ Lower lead than 25% of New Hampshire utilities
Population Served
2291
~975 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
5 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
100% of EPA action level
36.00 ppb
Action level: 15 ppb
The 90th-percentile lead result is 36.00 ppb, 240% 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
Lead and Copper Rule MONITORING AND REPORTING — TT 2021 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2019 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2018 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2018 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2018 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

5 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 Tilton Northfield Water Dist
PWSID NH2351010
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 2,291
Service connections 975
Systems serving this area 5
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Northfield tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 36.00 ppb, 240% of the action level.
Does Northfield 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 Northfield? ▼
Tilton Northfield Water Dist (PWSID NH2351010), one of 5 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2025-10-09. No significant deficiencies were recorded.

What Should Northfield 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

Concord, Nh Tap Water Quality 2026 Merrimack Franklin, Nh Tap Water Quality 2026 Merrimack Pembroke, Nh Tap Water Quality 2026 Merrimack Suncook, Nh Tap Water Quality 2026 Merrimack Hooksett, Nh Tap Water Quality 2026 Merrimack Henniker, Nh Tap Water Quality 2026 Merrimack