Massachusetts Title 5 septic inspection: what it allows on a lot
Title 5 septic inspection is Massachusetts law, and the official source is at mass.gov.
A home with a septic system must pass a Title 5 inspection before it is sold.
Whether it applies to one lot turns on where the lot is and what it is zoned; the city, county or state office named in the law decides. Mapped areas are approximate. This is a plain reading of public law with its source, not legal advice.
Free, no account. ParcelSheet shows the lot's mapped size, parcel lines and flood zone, and this law on the lot's Massachusetts sheet.
Other Massachusetts laws on a lot: Accessory dwellings (2025).