Designated 2023-07-07

Yarmouth

Yarmouth spans three designated watersheds and has a large stock of older homes on septic systems, particularly south of Route 28.

What Yarmouth filed

What that means if you are selling

Every watershed in Yarmouth 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 Yarmouth 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.

• Lewis Bay — also Barnstable (Permit application)
• Bass River — also Brewster (De Minimis application), Dennis (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

Yarmouth Board of Health holds septic records 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.