Septic Systems in Massachusetts: What Homeowners Should Know

State rules

Title 5 and the rules that shape a Massachusetts septic job

The regulation. Septic systems in Massachusetts fall under Title 5 of the State Environmental Code, 310 CMR 15.000. Its most recent amendments took effect July 7, 2023 and deal with nitrogen in coastal estuaries and embayments on Cape Cod (MassDEP: Title 5).

Your Board of Health comes first. Local boards issue septic permits, Local Upgrade Approvals and Certificates of Compliance, and may adopt rules more stringent than Title 5 (310 CMR 15.003). A board that goes beyond the state minimums has to hold a public hearing and state its local reasons (M.G.L. c.111 §31). Call your Board of Health before planning any septic work.

Inspection at sale. A Title 5 inspection is required within two years before a sale, or three years if the system has been pumped every year and the report includes the pumping records. If bad weather prevents it, the inspection can wait until up to six months after the sale, with written notice to the buyer; foreclosures, deeds in lieu, levies of execution and bankruptcy transfers can also be inspected up to six months after the transfer, with written notice to the buyer. Inspections are also required when a change needs a building or occupancy permit, such as adding a bedroom, when the building footprint changes, when properties are divided or combined, and when MassDEP or the Board of Health orders one. Foreclosures and bankruptcy transfers are not exempt (MassDEP: buying or selling).

Exempt transfers. Transfers between current spouses, parents and children, full siblings, or into a qualifying family trust don't need an inspection (M.G.L. c.21A §13). Neither do refinancing, divorce-settlement transfers, or a sale covered by a binding Board of Health agreement to upgrade or connect to sewer within two years (MassDEP: buying or selling). Half siblings and grandparent-to-grandchild transfers are not exempt (MassDEP exemption guidance).

Who may inspect. Only MassDEP-approved System Inspectors can conduct Title 5 inspections, using the MassDEP form (MassDEP). NEIWPCC keeps the approved lists (approved inspectors and soil evaluators). MassDEP does not regulate inspection fees, and you don't have to hire the inspector to do any other work on the system (MassDEP consumer tips).

Failed systems. A failed system must be upgraded within two years unless the Board of Health or MassDEP approves a different schedule, even if the house isn't being sold (MassDEP). Some problems, such as a leaking tank or a broken distribution box, can be a conditional pass fixed by a repair (official inspection form), but soil absorption systems and cesspools cannot be repaired under a conditional pass. Cesspools are nonconforming systems under Title 5 (310 CMR 15.002).

Permits and sign-off. No one may build, upgrade, modify or expand a system without a Disposal System Construction Permit, and the work must be finished with a Certificate of Compliance within three years or the permit expires unless extended (310 CMR 15.020). That holds even for replacing a single component such as a tank or distribution box (Title 5 repairs FAQ). Designs come from a registered sanitarian or a Massachusetts-registered professional engineer, and the Board of Health must approve the design and the installation (MassDEP: hiring inspectors and soil evaluators).

Septage haulers. Hauling septage takes a Septage Hauler Permit issued under M.G.L. c.111 §31 (310 CMR 15.002). MassDEP does not license pumpers and says to contact your local Board of Health to find a licensed hauler (MassDEP consumer tips).

Accessory dwelling units. MassDEP guidance of April 7, 2025 treats an ADU that raises a home's design flow as New Construction under Title 5, figured at 110 gallons per day per bedroom (MassDEP ADU guidance).

Digging. Septic repairs mean excavation, and the excavator must premark the area and notify Dig Safe at least 72 hours ahead, not counting weekends and legal holidays, and not more than 30 days ahead (M.G.L. c.82 §40A). Dig Safe members don't mark private lines (Dig Safe FAQ).

Last verified November 2026. Fees, restrictions and deadlines on this page are due for re-checking by January 2027.