https://www.mass.gov/info-details/watershed-protection-act#towns-affected-by-the-wspa

This law regulates land use and activities to protect the drinking water supply of over 3 million people.

The Watershed Protection Act (WsPA) regulates land use and activities within critical areas of the Quabbin Reservoir, Ware River and Wachusett Reservoir watersheds for the purpose of protecting the source supply of drinking water that is treated and distributed by the MA Water Resources Authority. The law is administered by DCR's Division of Water Supply Protection. The WsPA applies only to specific towns in the DCR watershed system.

Please note that compliance with the WsPA is the property owner's responsibility. DCR encourages you to contact the appropriate field office if you intend to build on or alter a piece of property, or make changes to an existing structure, in the watershed system.