Massachusetts Septic & Well Water Rules

Massachusetts septic systems are regulated under Title 5 of the State Environmental Code (310 CMR 15.000), administered by MassDEP and local boards of health.

This is a short state page. It covers only the facts we've verified from official sources so far.

Official lookups

Mass.gov: Hiring Title 5 System Inspectors

Inspection when you sell

For most property transfers, Title 5 (310 CMR 15.301) requires a septic system inspection at or within two years before the title transfer, and the buyer must receive the full inspection report.
If weather prevents the inspection, it may be done up to six months after transfer if the seller gives written notice.
Certain transfers are exempt, such as some transfers between spouses or between parents and children, refinancings, and some foreclosures. Check the MassDEP guidance for the full list.

Inspectors & validity

Use a MassDEP-approved Title 5 System Inspector.
An inspection is normally valid for 2 years, or up to 3 years if the system was pumped at least once a year and you keep the pumping records.

Maintenance

MassDEP recommends pumping every 3 years without a garbage disposal, or every year with one.

Private well testing

MassDEP recommends testing bacteria and nitrate/nitrite at least once a year, other contaminants periodically, and testing again after well repairs or plumbing changes.

Frequently asked questions

Is a Title 5 inspection required to sell a house in Massachusetts?

For most transfers, yes. The inspection must be done at or within two years before the transfer, unless an exemption applies.

Sources

Last checked: October 21, 2026