Public water system · NH0411010

Active

Charlestown Water Works

At a glance

Charlestown Water Works (PWSID NH0411010) is an active community water system in Sullivan County, New Hampshire. It reports serving 2,850 people through 1,250 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 10 violations for this system; 2 are health-based, and the most recent began in July 2025.

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

Population served

2,850

Service connections

1,250

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDNH0411010

System typeCommunity water system

Activity statusActive

Population served2,850

Service connections1,250

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyNH state drinking water program

City servedCharlestown

StateNew Hampshire

ZIP—

CountySullivan County

How does Charlestown Water Works compare with other water systems in Sullivan County?

By EPA's size categories, Charlestown Water Works is a small system (501 to 3,300 people). Sullivan County has 65 active public water systems, and Charlestown Water Works is the 4th-largest of them by population served. Its population served is about 5.6 times the county average of 510 people per system, and accounts for 8.6% of the 33,165 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 Charlestown Water Works is about 57% 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 Charlestown Water Works?

EPA lists Charlestown 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. 19 of the 65 active systems in Sullivan County (29%) are also owned by a local government.

Does Charlestown Water Works have drinking water violations?

EPA's records list 10 violations for this system; 2 are health-based, and the most recent began in July 2025. The violations listed here began between January 1991 and July 2025. By type: 7 monitoring and reporting, 2 contaminant level above the legal limit and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Haloacetic acids (HAA5) (2 of them). EPA lists 10 as resolved. 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.

Began	Violation	Contaminant or rule	Health-based	Status
2025-07-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2025-07-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2021-07-01	Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71	Consumer Confidence Rulecode 7000	No	Resolved
2019-07-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2019-07-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Resolved
2019-07-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2019-04-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Resolved
2017-01-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Resolved
1991-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21	Total coliform bacteria (TCR)code 3100	Yes	Resolved
1991-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved

All 10 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.

Charlestown Water Works: frequently asked questions

Who runs Charlestown Water Works?

Charlestown Water Works (PWSID NH0411010) is a community water system owned by a local government. It is regulated by the NH state drinking water program.

How many people does Charlestown Water Works serve?

Charlestown Water Works reports serving 2,850 people through 1,250 service connections in Sullivan County, New Hampshire.

Where does Charlestown 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 Charlestown Water Works have any drinking water violations?

EPA's records list 10 violations for this system; 2 are health-based, and the most recent began in July 2025. 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 Charlestown 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. EPA's records list 10 violations for this system; 2 are health-based, and the most recent began in July 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the NH state drinking water program.

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

As a community water system, Charlestown 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 Sullivan County

Water system	County	Population served	Type	Source
Claremont Water Dept	Sullivan	9,000	Community	Surface water
Newport Water Works	Sullivan	5,000	Community	Surface water
Village Dist of Eastman	Sullivan	3,400	Community	Groundwater
Sunapee Water Works	Sullivan	1,680	Community	Surface water
Springfield Rest Area	Sullivan	999	Transient non-community	Groundwater
Fall Mountain Regional Hs	Sullivan	850	Non-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, “Charlestown Water Works, PWSID NH0411010, New Hampshire”, https://aquacensus.com/water-systems/new-hampshire/charlestown-water-works-nh0411010 (data as of October 1, 2026).