Determination
Find your property on the map
Click your property. If it sits inside a designated Nitrogen Sensitive Area, you get the statement that currently applies, the filing that supports it, and the sources so you can check every step yourself.
Search for the address, or zoom in and click the property directly. Shaded areas are MassDEP's designated watersheds. Drag the pin if it does not land exactly on the building.
This is a reading of public records, not a legal opinion. The shaded areas
are MassDEP's own boundary data, retrieved 26 August 2026. The filings reflect
MassDEP's watershed application table dated 11 June 2026. Both change.
MassDEP's own address map is the authority, and your Board of Health
decides. Confirm before you sign anything.
Prefer to pick from a list instead? Check a property by town and watershed →
Boundaries: MassDEP Natural Resource Nitrogen Sensitive Areas feature layer, retrieved 26 August 2026. Filings: MassDEP watershed application table, 11 June 2026. Base map © MapTiler © OpenStreetMap contributors.