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Michael GraingerLicensed

Licensed septic contractor based in Londonderry, Rockingham County, NH

License number	00700, 05618
License type	Professional Engineer, Septic System Designer, Septic System Installer
License status	Active, NH DES Designer/Installer roster
Based in	Londonderry, Rockingham County, New Hampshire 03053

"Based in" is the city and county of the address on the business's license record. That can be a mailing address; it doesn't tell you where the business works.

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What this license covers

Design: licensed to size and lay out a septic system for a specific site and soil condition.
Installation / repair: licensed to build and install septic tanks and drainfields, and to repair or replace failed ones.

How to verify this license

We publish the license details exactly as they appear in the official licensing records of the agency that issued the license; we do not vouch for the business itself. Before hiring, look up license #00700, 05618 directly with the agency that issued it, confirm it is still active, and ask for a current certificate of insurance.

Source: NH DES - Septic System Designers & Installers, last checked 2026-08-16. Verify at the official source.

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