Public water system · MA3035001
ActiveDeer Island (MWRA)
At a glance
Deer Island (MWRA) (PWSID MA3035001) is an active non-transient non-community water system in Suffolk County, Massachusetts. It reports serving 350 people through 1 service connection. Its primary water source is purchased surface water, and EPA lists it as owned by a state government. EPA's Safe Drinking Water Act records list no violations for this system.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
350
Service connections
1
Primary source
SWP
Purchased surface water
System type
NTNCWS
Non-transient non-community water system
System record
How does Deer Island (MWRA) compare with other water systems in Suffolk County?
By EPA's size categories, Deer Island (MWRA) is a very small system (500 people or fewer). Suffolk County has 9 active public water systems. Its population served is well below the county average of 375,415 people per system, and accounts for less than 0.1% of the 3,378,736 people reported by systems filed under the county. Across Massachusetts, the 1,636 active systems average 6,275 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Deer Island (MWRA) is about 19% below that figure.
What does “non-transient non-community water system” mean?
A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. Massachusetts has 246 active non-transient non-community water systems, 15% of the state's 1,636 active systems. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 126 Massachusetts systems (7.7%) list purchased surface water as their primary source.
Who owns and regulates Deer Island (MWRA)?
EPA lists Deer Island (MWRA) as owned by a state 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. 2 of the 9 active systems in Suffolk County (22%) are also owned by a state government.
Does Deer Island (MWRA) 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 Deer Island (MWRA). For the latest compliance status, check EPA ECHO for current compliance history.
Deer Island (MWRA): frequently asked questions
Who runs Deer Island (MWRA)?
Deer Island (MWRA) (PWSID MA3035001) is a non-transient non-community water system owned by a state government. It is regulated by the MA state drinking water program.
How many people does Deer Island (MWRA) serve?
Deer Island (MWRA) reports serving 350 people through 1 service connection in Suffolk County, Massachusetts.
Where does Deer Island (MWRA) get its water?
EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.
Does Deer Island (MWRA) have any drinking water violations?
EPA's Safe Drinking Water Act records list no violations for this system.
Is Deer Island (MWRA)'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 EPA ECHO, or the MA state drinking water program.
Where can I find Deer Island (MWRA)'s water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Deer Island (MWRA) is a non-transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
Other water systems in Suffolk County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| MWRA | Suffolk | 2,580,000 | Community | Surface water |
| Boston Water and Sewer Commission (MWRA) | Suffolk | 675,647 | Community | Purchased surface water |
| Revere Water Division (MWRA) | Suffolk | 62,186 | Community | Purchased surface water |
| Chelsea Water Dept. (MWRA) | Suffolk | 40,787 | Community | Purchased surface water |
| Winthrop Water Division, (MWRA) | Suffolk | 19,316 | Community | Purchased surface water |
| Rocky Mt Sprg @ Supreme Liq Boston Vnd | Suffolk | 400 | Transient non-community | Purchased groundwater |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “Deer Island (MWRA), PWSID MA3035001, Massachusetts”, https://aquacensus.com/water-systems/massachusetts/deer-island-mwra-ma3035001 (data as of October 1, 2026).