Massachusetts water systems, mapped
280 systems drawn on their service areas, coloured by the most recent water loss figure each one filed. Every shape is a link to that system's own filings.
- under 7.0%
- 7.0%–10.0%
- 10.0%–14.0%
- 14.0%–22.0%
- over 22.0%
- no figure filed
What a shape here is
The service areas come from the US EPA's national boundary layer, which the agency publishes as an estimate: it disclaims the spatial accuracy of the features and names local government as the accurate source. Some of those shapes were published by a state agency, a county or the utility itself, and some EPA modelled. In Massachusetts, none of the shapes drawn here is a model — every one was published by a state agency, a county or a utility.
A boundary is not a customer list and not a legal service territory. Two systems can cover the same ground — a wholesaler and the retailer it supplies — and being inside one of these shapes does not make an address that system's ratepayer.
What is not on the map
1 Massachusetts system has filings on this site and no boundary in EPA's layer, so it is absent from the map and listed here instead:
Boundaries: US EPA Office of Research and Development, community water system service area boundaries,
retrieved 2026-09-09 and archived as data/archive/epa-cws-boundaries/2026-09-09-ma.geojson. The state outline behind them is a
US Census cartographic boundary file, drawn for orientation; no figure here is derived from it. Figures: MassDEP Drinking Water Program, as
filed by each utility — the Massachusetts index carries them as a table, and
each system's page carries the archived cell every figure was read from.
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