Public water system · NH1621010
ActivePennichuck Water Works
At a glance
Pennichuck Water Works (PWSID NH1621010) is an active community water system in Hillsborough County, New Hampshire. It reports serving 88,853 people through 27,007 service connections. Its primary water source is surface water, and EPA lists it as privately owned. EPA's records list 2 violations for this system; 1 is health-based, and the most recent began in October 2008.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
88,853
Service connections
27,007
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Pennichuck Water Works compare with other water systems in Hillsborough County?
By EPA's size categories, Pennichuck Water Works is a large system (10,001 to 100,000 people). Hillsborough County has 279 active public water systems, and Pennichuck Water Works is the 2nd-largest of them by population served. Its population served is about 74 times the county average of 1,206 people per system, and accounts for 26% 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 Pennichuck Water Works is about 13 times 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 Pennichuck Water Works?
EPA lists Pennichuck Water Works as privately owned. 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. 238 of the 279 active systems in Hillsborough County (85%) are also privately owned.
Does Pennichuck Water Works have drinking water violations?
EPA's records list 2 violations for this system; 1 is health-based, and the most recent began in October 2008. The violations listed here began between August 2002 and October 2008. By type: 1 monitoring and reporting and 1 required treatment not met. The contaminants or rules involved are Lead and Copper Rule and Surface Water Treatment Rule. EPA lists 2 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 |
|---|---|---|---|---|
| 2008-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2002-08-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
All 2 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.
Pennichuck Water Works: frequently asked questions
Who runs Pennichuck Water Works?
Pennichuck Water Works (PWSID NH1621010) is a community water system privately owned. It is regulated by the NH state drinking water program.
How many people does Pennichuck Water Works serve?
Pennichuck Water Works reports serving 88,853 people through 27,007 service connections in Hillsborough County, New Hampshire.
Where does Pennichuck 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 Pennichuck Water Works have any drinking water violations?
EPA's records list 2 violations for this system; 1 is health-based, and the most recent began in October 2008. 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 Pennichuck 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 2 violations for this system; 1 is health-based, and the most recent began in October 2008. For current results, consult the system's annual water quality report, EPA ECHO, or the NH state drinking water program.
Where can I find Pennichuck Water Works' water quality report?
As a community water system, Pennichuck 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 |
| 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 |
| Peterborough Water Works | Hillsborough | 4,500 | 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, “Pennichuck Water Works, PWSID NH1621010, New Hampshire”, https://aquacensus.com/water-systems/new-hampshire/pennichuck-water-works-nh1621010 (data as of October 1, 2026).