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Northumberland, NH Tap Water Quality 2026

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

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

Main Utility: Groveton Water Sys PWSID: NH1781010 Updated: 2026 Q2
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Lead above the federal action level

Lead is 30.00 ppb, 200% of the action level and no violations are open. PFAS has never been sampled at this system.

C

Northumberland earns a C for water quality

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

Lead: 30.00 ppb — 200% of the federal action level
PFAS never sampled at this system
No violations since 2015
No violations currently open
Northumberland's lead level vs. all New Hampshire community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 30.00 ppb — 100% of the federal action level
✓ Lower lead than 40% of New Hampshire utilities
Population Served
1815
~765 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
None on record since 2015

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
100% of EPA action level
30.00 ppb
Action level: 15 ppb
The 90th-percentile lead result is 30.00 ppb, 200% 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)

✓ No violations on record for this water system.
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

No violations are on record for this system since 2015. EPA records violations for every community water system, so this reflects a clean compliance history rather than missing data.

About the Main Water System

Utility Groveton Water Sys
PWSID NH1781010
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 1,815
Service connections 765
Systems serving this area 2
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Northumberland tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 30.00 ppb, 200% of the action level.
Does Northumberland 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 Northumberland? ▼
Groveton Water Sys (PWSID NH1781010), one of 2 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2024-01-04. No significant deficiencies were recorded.

What Should Northumberland 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

Berlin, Nh Tap Water Quality 2026 Coos Lancaster, Nh Tap Water Quality 2026 Coos Gorham, Nh Tap Water Quality 2026 Coos Whitefield, Nh Tap Water Quality 2026 Coos Whitefield, Nh Tap Water Quality 2026 Coos Colebrook, Nh Tap Water Quality 2026 Coos