N.C.S. Construction

Under Title 5 (310 CMR 15.00), any septic installation or repair in Sandwich needs a permit from the Sandwich Board of Health, and the design must be stamped by a registered sanitarian or professional engineer. A Title 5 inspection is required before most property transfers. The bigger driver here is MassDEP's 2023 watershed-permit regulations, which in designated nitrogen-sensitive Cape watersheds require nitrogen-reducing Innovative/Alternative (I/A) systems for new and upgraded installs, so many Sandwich replacements now must use an I/A system rather than a conventional one.

Sandwich sits in the Cape Cod band, where septic costs run high because of nitrogen rules and seasonal demand. A Title 5 inspection at sale typically runs a few hundred dollars up to about $1,000, and tank pumping is usually a few hundred. A full conventional system replacement commonly runs roughly $20,000–$35,000, but the bigger driver in Sandwich is the nitrogen-reducing I/A system increasingly required in designated watersheds, which runs $30,000 or more and adds ongoing inspection and maintenance costs a conventional system does not carry.

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 Sandwich page.