David B. MasonLicensed

License details

"Based in" is the city and county of the address on the business's license record.

What this license covers

• Site testing: licensed to run percolation tests and evaluate soils to determine what kind of system a site can support.
• Inspection: licensed to inspect existing septic systems; the license you want for a home-purchase inspection.

How to verify this license

We publish the license details exactly as they appear in the public licensing records of the agency that issued the license; we do not vouch for the business itself. Before hiring, look up license #287, 1501 directly with the agency that issued it, confirm it is still active, and ask for a current certificate of insurance.

Source: MassDEP Title 5 - System Inspectors · MassDEP - Soil Evaluators, last checked 2026-08-17. Look it up at the issuing agency.