Public water system · MA4173001
ActiveMattapoisett River Valley W.D.
At a glance
Mattapoisett River Valley W.D. (PWSID MA4173001) is an active community water system in Plymouth County, Massachusetts. It reports serving 29,600 people through 1 service connection. Its primary water source is purchased groundwater, and EPA lists it as owned by a local government. EPA's Safe Drinking Water Act records list no violations for this system.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
29,600
Service connections
1
Primary source
GWP
Purchased groundwater
System type
CWS
Community water system
System record
How does Mattapoisett River Valley W.D. compare with other water systems in Plymouth County?
By EPA's size categories, Mattapoisett River Valley W.D. is a large system (10,001 to 100,000 people). Plymouth County has 129 active public water systems, and Mattapoisett River Valley W.D. is the 6th-largest of them by population served. Its population served is about 6.7 times the county average of 4,447 people per system, and accounts for 5.2% 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 Mattapoisett River Valley W.D. is about 4.4 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. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own. 57 Massachusetts systems (3.5%) list purchased groundwater as their primary source.
Who owns and regulates Mattapoisett River Valley W.D.?
EPA lists Mattapoisett River Valley W.D. 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 Mattapoisett River Valley W.D. have drinking water violations?
No SDWA violations on record.
EPA's SDWA violation and enforcement data (via EPA ECHO, updated quarterly) lists no violations for Mattapoisett River Valley W.D.. For the latest compliance status, check EPA ECHO for current compliance history.
Mattapoisett River Valley W.D.: frequently asked questions
Who runs Mattapoisett River Valley W.D.?
Mattapoisett River Valley W.D. (PWSID MA4173001) is a community water system owned by a local government. It is regulated by the MA state drinking water program.
How many people does Mattapoisett River Valley W.D. serve?
Mattapoisett River Valley W.D. reports serving 29,600 people through 1 service connection in Plymouth County, Massachusetts.
Where does Mattapoisett River Valley W.D. get its water?
EPA SDWIS lists this system's primary water source as purchased groundwater. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own.
Does Mattapoisett River Valley W.D. have any drinking water violations?
EPA's Safe Drinking Water Act records list no violations for this system.
Is Mattapoisett River Valley W.D.'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. EPA's Safe Drinking Water Act records list no violations for this system. For current results, consult the system's annual water quality report, EPA ECHO, or the MA state drinking water program.
Where can I find Mattapoisett River Valley W.D.'s water quality report?
As a community water system, Mattapoisett River Valley W.D. 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 |
| 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, “Mattapoisett River Valley W.D., PWSID MA4173001, Massachusetts”, https://aquacensus.com/water-systems/massachusetts/mattapoisett-river-valley-w-d-ma4173001 (data as of October 1, 2026).