Designated 2023-07-07

Mashpee

Mashpee was a named party in the Conservation Law Foundation settlement that produced these regulations. It has filed on five watersheds, using two different legal routes.

What Mashpee filed

What that means if you are selling

Every watershed in Mashpee is covered by a filing, so the nitrogen upgrade requirement is suspended here. On the MassDEP disclosure form a seller in one of these watersheds would normally tick box 2 — in a Nitrogen Sensitive Area, not currently subject to an upgrade — and name the filing above.

If Mashpee were to miss the milestones in its approved schedule, MassDEP could start the five-year upgrade clock, which would run to 8 July 2030. That has not happened. It is the reason this page carries a date and gets re-checked.

Watersheds shared with other towns

These cross town lines, and the neighbouring town did not always file the same way — so two properties in the same watershed can sit in different positions.

• Three Bays — also Barnstable (Permit application), Sandwich (Notice of Intent)
• Popponesset Bay — also Barnstable (Permit application), Sandwich (Notice of Intent)
• Waquoit Bay — also Sandwich (Notice of Intent)
• Bournes Pond — also Falmouth (Notice of Intent)
• Green Pond — also Falmouth (Notice of Intent)

The requirement that applies either way

A passing Title 5 inspection is required before you transfer title anywhere in Massachusetts, and it is valid for two years — three if you have documented annual pumping. That is independent of anything on this page.

Your septic records

Mashpee Board of Health holds septic plans and Title 5 reports. If you are trying to establish that nitrogen-reducing technology was already installed — box 3 on the disclosure form — that installation date is what you need, and the Board of Health file is where it lives.

Filings from MassDEP watershed application table, 11 June 2026.