R F Roach Co

Title 5 (310 CMR 15.00) governs on-site systems in Weymouth, requiring a permit from the Weymouth Health Department and a design stamped by a registered sanitarian or professional engineer, built by a licensed installer. Before most transfers, a Title 5 inspection by a licensed inspector applies to septic-served properties, and the passing certificate is what a closing depends on. On lots near the Back River, Fore River, or harbor marshes, a Weymouth Conservation Commission filing and possible nitrogen-sensitive-area rules can apply to system work.

Weymouth septic costs run in the South Shore mid-to-upper range when on-site work is needed, though most parcels are sewered. A Title 5 inspection at sale typically runs a few hundred dollars to about $1,000, and tank pumping a few hundred dollars. A full conventional replacement on a coastal Weymouth lot commonly runs roughly $20,000–$35,000, and a nitrogen-reducing I/A system $30,000 or more where a sensitive-area designation applies near the estuaries. High groundwater near the rivers pushes the upper end.

Massachusetts requires a written contract and a Home Improvement Contractor registration for most residential septic installation & service work; ask for the registration number and check it before paying a deposit.

More on permits, costs, rebates and common questions, plus every other septic installation & service contractor serving the town, on the Septic Services in Weymouth page.