Public water system · NH0231010
ActiveBerlin Water Works
At a glance
Berlin Water Works (PWSID NH0231010) is an active community water system in Coos County, New Hampshire. It reports serving 9,575 people through 3,580 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 2 violations for this system; 1 is health-based, and the most recent began in December 2021.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
9,575
Service connections
3,580
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Berlin Water Works compare with other water systems in Coos County?
By EPA's size categories, Berlin Water Works is a medium system (3,301 to 10,000 people). Coos County has 112 active public water systems, and Berlin Water Works is the largest of them by population served. Its population served is about 26 times the county average of 368 people per system, and accounts for 23% of the 41,217 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 Berlin Water Works is about 43% above 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 Berlin Water Works?
EPA lists Berlin 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. 18 of the 112 active systems in Coos County (16%) are also owned by a local government.
Does Berlin 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 December 2021. The violations listed here began between November 2011 and December 2021. By type: 1 monitoring and reporting and 1 contaminant level above the legal limit. The contaminants or rules involved are Lead and Copper Rule and Total coliform bacteria (TCR). 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 |
|---|---|---|---|---|
| 2021-12-30 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2011-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | 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.
Berlin Water Works: frequently asked questions
Who runs Berlin Water Works?
Berlin Water Works (PWSID NH0231010) is a community water system owned by a local government. It is regulated by the NH state drinking water program.
How many people does Berlin Water Works serve?
Berlin Water Works reports serving 9,575 people through 3,580 service connections in Coos County, New Hampshire.
Where does Berlin 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 Berlin 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 December 2021. 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 Berlin 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 December 2021. For current results, consult the system's annual water quality report, EPA ECHO, or the NH state drinking water program.
Where can I find Berlin Water Works' water quality report?
As a community water system, Berlin 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 Coos County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Groveton Water Sys | Coos | 2,650 | Community | Groundwater |
| Gorham Water and Sewer Dept | Coos | 2,630 | Community | Surface water |
| Lancaster Water Dept | Coos | 2,500 | Community | Surface water |
| Whitefield Water | Coos | 1,640 | Community | Groundwater |
| Colebrook Water Works | Coos | 1,300 | Community | Groundwater |
| Rogers Campground | Coos | 1,250 | 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, “Berlin Water Works, PWSID NH0231010, New Hampshire”, https://aquacensus.com/water-systems/new-hampshire/berlin-water-works-nh0231010 (data as of October 1, 2026).