Public water system · MA4131000
ActiveWeir River Water System
At a glance
Weir River Water System (PWSID MA4131000) is an active community water system in Plymouth County, Massachusetts. It reports serving 45,339 people through 12,755 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, none is health-based, and the most recent began in April 2021.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
45,339
Service connections
12,755
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Weir River Water System compare with other water systems in Plymouth County?
By EPA's size categories, Weir River Water System is a large system (10,001 to 100,000 people). Plymouth County has 129 active public water systems, and Weir River Water System is the 3rd-largest of them by population served. Its population served is about 10 times the county average of 4,447 people per system, and accounts for 7.9% 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 Weir River Water System is about 6.8 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. Massachusetts has 531 active community water systems, 32% of the state's 1,636 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 76 Massachusetts systems (4.6%) list surface water as their primary source.
Who owns and regulates Weir River Water System?
EPA lists Weir River Water System 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 Weir River Water System 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 2021. The violations listed here began between April 2021 and April 2021. By type: 12 monitoring and reporting. The contaminants or rules involved are Hexachlorobenzene, Methoxychlor, Heptachlor and Carbofuran. 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 |
|---|---|---|---|---|
| 2021-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Hexachlorobenzenecode 2274 | No | Archived |
| 2021-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Methoxychlorcode 2015 | No | Archived |
| 2021-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Heptachlorcode 2065 | No | Archived |
| 2021-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Carbofurancode 2046 | No | Archived |
| 2021-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Polychlorinated biphenyls (PCBs), totalcode 2383 | No | Archived |
| 2021-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Picloramcode 2040 | No | Archived |
| 2021-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Toxaphenecode 2020 | No | Archived |
| 2021-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Dinosebcode 2041 | No | Archived |
| 2021-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Chlordanecode 2959 | No | Archived |
| 2021-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | 2,4,5-TP (Silvex)code 2110 | No | Archived |
| 2021-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,2-Dibromo-3-chloropropane (DBCP)code 2931 | No | Archived |
| 2021-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Alachlor (Lasso)code 2051 | 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.
Weir River Water System: frequently asked questions
Who runs Weir River Water System?
Weir River Water System (PWSID MA4131000) is a community water system owned by a local government. It is regulated by the MA state drinking water program.
How many people does Weir River Water System serve?
Weir River Water System reports serving 45,339 people through 12,755 service connections in Plymouth County, Massachusetts.
Where does Weir River Water System 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 Weir River Water System 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 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 Weir River Water System'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 2021. For current results, consult the system's annual water quality report, EPA ECHO, or the MA state drinking water program.
Where can I find Weir River Water System's water quality report?
As a community water system, Weir River Water System 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 |
| 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 |
| Bridgewater Water Department | Plymouth | 28,633 | 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, “Weir River Water System, PWSID MA4131000, Massachusetts”, https://aquacensus.com/water-systems/massachusetts/weir-river-water-system-ma4131000 (data as of October 1, 2026).