Public water system · NH0061010

Active

Alton Water Works

At a glance

Alton Water Works (PWSID NH0061010) is an active community water system in Belknap County, New Hampshire. It reports serving 1,800 people through 712 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in March 2026.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

1,800

Service connections

712

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDNH0061010

System typeCommunity water system

Activity statusActive

Population served1,800

Service connections712

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyNH state drinking water program

City servedAlton

StateNew Hampshire

ZIP—

CountyBelknap County

How does Alton Water Works compare with other water systems in Belknap County?

By EPA's size categories, Alton Water Works is a small system (501 to 3,300 people). Belknap County has 255 active public water systems, and Alton Water Works is the 4th-largest of them by population served. Its population served is about 6.5 times the county average of 278 people per system, and accounts for 2.5% of the 70,916 people reported by systems filed under the county. Across New Hampshire, the 2,450 active systems average 508 people each. Nationally, the average active community water system reports serving 6,703 people, so Alton Water Works is well below that figure.

What does “community water system” mean?

A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. New Hampshire has 706 active community water systems, 29% of the state's 2,450 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 2,374 New Hampshire systems (97%) list groundwater as their primary source.

Who owns and regulates Alton Water Works?

EPA lists Alton Water Works as owned by a local government. The NH state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 20 of the 255 active systems in Belknap County (7.8%) are also owned by a local government.

Does Alton Water Works have drinking water violations?

Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in March 2026. The violations listed here began between July 2014 and March 2026. By type: 10 monitoring and reporting and 2 contaminant level above the legal limit. The contaminant or rule involved most often is Arsenic (2 of them). EPA lists 11 as resolved and 1 as unaddressed. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.

Began	Violation	Contaminant or rule	Health-based	Status
2026-03-31	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Unaddressed
2020-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2020-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2014-07-01	Monitoring and reportingMonitoring, Regular · code 03	cis-1,2-Dichloroethylenecode 2380	No	Resolved
2014-07-01	Monitoring and reportingMonitoring, Regular · code 03	Dichloromethanecode 2964	No	Resolved
2014-07-01	Monitoring and reportingMonitoring, Regular · code 03	Carbon tetrachloridecode 2982	No	Resolved
2014-07-01	Monitoring and reportingMonitoring, Regular · code 03	Chromiumcode 1020	No	Resolved
2014-07-01	Monitoring and reportingMonitoring, Regular · code 03	1,1,2-Trichloroethanecode 2985	No	Resolved
2014-07-01	Monitoring and reportingMonitoring, Regular · code 03	Benzenecode 2990	No	Resolved
2014-07-01	Monitoring and reportingMonitoring, Regular · code 03	Toluenecode 2991	No	Resolved
2014-07-01	Monitoring and reportingMonitoring, Regular · code 03	Styrenecode 2996	No	Resolved
2014-07-01	Monitoring and reportingMonitoring, Regular · code 03	1,2-Dichloropropanecode 2983	No	Resolved

The 12 most recent violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.

Alton Water Works: frequently asked questions

Who runs Alton Water Works?

Alton Water Works (PWSID NH0061010) is a community water system owned by a local government. It is regulated by the NH state drinking water program.

How many people does Alton Water Works serve?

Alton Water Works reports serving 1,800 people through 712 service connections in Belknap County, New Hampshire.

Where does Alton Water Works get its water?

EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.

Does Alton Water Works have any drinking water violations?

Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in March 2026. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.

Is Alton Water Works' water safe to drink?

AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in March 2026. For current results, consult the system's annual water quality report, EPA ECHO, or the NH state drinking water program.

Where can I find Alton Water Works' water quality report?

As a community water system, Alton Water Works must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.

Other water systems in Belknap County

Water system	County	Population served	Type	Source
Laconia Water Works	Belknap	17,125	Community	Surface water
Meredith Water Dept	Belknap	3,750	Community	Surface water
Locke Lake	Belknap	2,308	Community	Surface water
Belmont Water Dept	Belknap	1,612	Community	Groundwater
Gunstock Acres Village Dist	Belknap	1,440	Community	Groundwater
Sawyers Dairy Bar	Belknap	999	Transient non-community	Groundwater

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About this data

Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.

Cite as: AquaCensus, “Alton Water Works, PWSID NH0061010, New Hampshire”, https://aquacensus.com/water-systems/new-hampshire/alton-water-works-nh0061010 (data as of October 1, 2026).