Alton, NH Tap Water Quality 2026

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

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

Main Utility: Alton Water Works PWSID: NH0061010 Updated: 2026 Q2

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Lead above the federal action level

Lead is 210.00 ppb, 1400% of the action level and no violations are open. PFAS has never been sampled at this system.

Alton earns a D for water quality

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

Lead: 210.00 ppb — 1400% of the federal action level

PFAS never sampled at this system

3 violations since 2015, 2 health-based

No violations currently open

Alton's lead level vs. all New Hampshire community water systems

0 ppb5 ppb10 ppb15 ppb

Lead level: 210.00 ppb — 100% of the federal action level

✓ Lower lead than 2% of New Hampshire utilities

Population Served

1622

~712 connections

Water Source

Groundwater

Drawn from wells — SDWIS source code GW

Active Violations

3 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)

90th percentile of tap samples collected across the distribution system

100% of EPA action level

210.00 ppb

Action level: 15 ppb

Copper (Cu)

90th percentile of tap samples. SDWIS reports a copper figure only when a system exceeds the action level, so any value here is an exceedance.

184.6% of EPA action level

2,400 ppb

Action level: 1,300 ppb

The 90th-percentile lead result is 210.00 ppb, 1400% 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. Copper reached the action level here; a copper figure appears in SDWIS only when a system triggers it.

Contaminant Violations (2015–Present)

Contaminant	Type	Measured	Limit	Period	Status
Lead and Copper Rule	MONITORING AND REPORTING	—	TT	2026	Unaddressed
Arsenic	MCL EXCEEDANCE	0.011 MG/L	0.010 mg/L	2020	Resolved
Arsenic	MCL EXCEEDANCE	0.019 MG/L	0.010 mg/L	2020	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

3 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 Alton Water Works

PWSID NH0061010

Water source Groundwater — Drawn from wells — SDWIS source code GW

Population served 1,622

Service connections 712

Systems serving this area 5

Regulator State primacy agency

Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Alton tap water safe to drink? ▼

No federal limit is exceeded on record. No violations are currently open. Lead is 210.00 ppb, 1400% of the action level.

Does Alton 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 Alton? ▼

Alton Water Works (PWSID NH0061010), 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 2024-08-14. No significant deficiencies were recorded.

What Should Alton Residents Do?

Consider a filter certified for lead

Look for NSF/ANSI 53 certification for lead reduction.

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.

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

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