Public water system · MA4122000
ActiveHanover Water Dept
At a glance
Hanover Water Dept (PWSID MA4122000) is an active community water system in Plymouth County, Massachusetts. It reports serving 14,984 people through 5,172 service connections. Its primary water source is groundwater under influence of surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
14,984
Service connections
5,172
Primary source
GU
Groundwater under influence of surface water
System type
CWS
Community water system
System record
How does Hanover Water Dept compare with other water systems in Plymouth County?
By EPA's size categories, Hanover Water Dept is a large system (10,001 to 100,000 people). Plymouth County has 129 active public water systems. Its population served is about 3.4 times the county average of 4,447 people per system, and accounts for 2.6% of the 573,676 people reported by systems filed under the county. Across Massachusetts, the 1,636 active systems average 6,275 people each. Nationally, the average active community water system reports serving 6,703 people, so Hanover Water Dept is about 124% 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. Massachusetts has 531 active community water systems, 32% of the state's 1,636 active systems. Groundwater under the influence of surface water is well or spring water that the regulator has found to be affected by nearby surface water, so it is regulated under the surface-water treatment rules. 14 Massachusetts systems (0.9%) list groundwater under influence of surface water as their primary source.
Who owns and regulates Hanover Water Dept?
EPA lists Hanover Water Dept as owned by a local government. The MA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 37 of the 129 active systems in Plymouth County (29%) are also owned by a local government.
Does Hanover Water Dept have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 2025. The violations listed here began between April 2025 and April 2025. By type: 12 monitoring and reporting. The contaminants or rules involved are Cadmium, Antimony, Thallium and Barium. EPA lists 12 as archived. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Cadmiumcode 1015 | No | Archived |
| 2025-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Antimonycode 1074 | No | Archived |
| 2025-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Thalliumcode 1085 | No | Archived |
| 2025-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Bariumcode 1010 | No | Archived |
| 2025-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Seleniumcode 1045 | No | Archived |
| 2025-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Mercurycode 1035 | No | Archived |
| 2025-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Archived |
| 2025-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Berylliumcode 1075 | No | Archived |
| 2025-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Cyanidecode 1024 | No | Archived |
| 2025-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nickelcode 1036 | No | Archived |
| 2025-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Fluoridecode 1025 | No | Archived |
| 2025-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Chromiumcode 1020 | No | Archived |
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.
Hanover Water Dept: frequently asked questions
Who runs Hanover Water Dept?
Hanover Water Dept (PWSID MA4122000) is a community water system owned by a local government. It is regulated by the MA state drinking water program.
How many people does Hanover Water Dept serve?
Hanover Water Dept reports serving 14,984 people through 5,172 service connections in Plymouth County, Massachusetts.
Where does Hanover Water Dept get its water?
EPA SDWIS lists this system's primary water source as groundwater under influence of surface water. Groundwater under the influence of surface water is well or spring water that the regulator has found to be affected by nearby surface water, so it is regulated under the surface-water treatment rules.
Does Hanover Water Dept have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 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 Hanover Water Dept's 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, none is health-based, and the most recent began in April 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the MA state drinking water program.
Where can I find Hanover Water Dept's water quality report?
As a community water system, Hanover Water Dept 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 Plymouth County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Brockton Water Department | Plymouth | 105,788 | Community | Surface water |
| Plymouth Water Department | Plymouth | 47,100 | Community | Groundwater |
| Weir River Water System | Plymouth | 45,339 | Community | Surface water |
| Marshfield Water Department | Plymouth | 34,000 | Community | Groundwater |
| Abington/Rockland Joint Wtr. Works | Plymouth | 33,387 | Community | Surface water |
| Mattapoisett River Valley W.D. | Plymouth | 29,600 | Community | Purchased 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, “Hanover Water Dept, PWSID MA4122000, Massachusetts”, https://aquacensus.com/water-systems/massachusetts/hanover-water-dept-ma4122000 (data as of October 1, 2026).