Public water system · NH1141010

Active

Hillsborough Water Works

At a glance

Hillsborough Water Works (PWSID NH1141010) is an active community water system in Hillsborough County, New Hampshire. It reports serving 2,000 people through 907 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 10 are health-based, and the most recent began in January 2018.

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

Population served

2,000

Service connections

907

Primary source

Surface water

System type

CWS

Community water system

System record

PWSIDNH1141010

System typeCommunity water system

Activity statusActive

Population served2,000

Service connections907

Primary water sourceSurface water

Owner typeLocal government

Primacy agencyNH state drinking water program

City servedHillsborough

StateNew Hampshire

ZIP—

CountyHillsborough County

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

By EPA's size categories, Hillsborough Water Works is a small system (501 to 3,300 people). Hillsborough County has 279 active public water systems. Its population served is about 66% above the county average of 1,206 people per system, and accounts for 0.6% of the 336,507 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 Hillsborough 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. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 39 New Hampshire systems (1.6%) list surface water as their primary source.

Who owns and regulates Hillsborough Water Works?

EPA lists Hillsborough 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. 36 of the 279 active systems in Hillsborough County (13%) are also owned by a local government.

Does Hillsborough Water Works have drinking water violations?

Of the 12 most recent violations in EPA's records, 10 are health-based, and the most recent began in January 2018. The violations listed here began between October 2012 and January 2018. By type: 10 contaminant level above the legal limit and 2 monitoring and reporting. The contaminant or rule involved most often is Haloacetic acids (HAA5) (7 of them). EPA lists 12 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
2018-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2018-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2014-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Haloacetic acids (HAA5)code 2456	Yes	Resolved
2014-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Haloacetic acids (HAA5)code 2456	Yes	Resolved
2014-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2013-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Haloacetic acids (HAA5)code 2456	Yes	Resolved
2013-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2013-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2013-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Haloacetic acids (HAA5)code 2456	Yes	Resolved
2013-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2013-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Haloacetic acids (HAA5)code 2456	Yes	Resolved
2012-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Haloacetic acids (HAA5)code 2456	Yes	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.

Hillsborough Water Works: frequently asked questions

Who runs Hillsborough Water Works?

Hillsborough Water Works (PWSID NH1141010) is a community water system owned by a local government. It is regulated by the NH state drinking water program.

How many people does Hillsborough Water Works serve?

Hillsborough Water Works reports serving 2,000 people through 907 service connections in Hillsborough County, New Hampshire.

Where does Hillsborough Water Works get its water?

EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.

Does Hillsborough Water Works have any drinking water violations?

Of the 12 most recent violations in EPA's records, 10 are health-based, and the most recent began in January 2018. 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 Hillsborough 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, 10 are health-based, and the most recent began in January 2018. For current results, consult the system's annual water quality report, EPA ECHO, or the NH state drinking water program.

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

As a community water system, Hillsborough 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 Hillsborough County

Water system	County	Population served	Type	Source
Manchester Water Works	Hillsborough	123,500	Community	Surface water
Pennichuck Water Works	Hillsborough	88,853	Community	Surface water
Merrimack Village Dist	Hillsborough	25,500	Community	Groundwater
Hudson Water Dept	Hillsborough	16,700	Community	Groundwater
Milford Water Utilities Dept	Hillsborough	9,500	Community	Purchased surface water
Litchfield	Hillsborough	6,920	Community	Purchased surface water

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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, “Hillsborough Water Works, PWSID NH1141010, New Hampshire”, https://aquacensus.com/water-systems/new-hampshire/hillsborough-water-works-nh1141010 (data as of October 1, 2026).