GroundRosterMark LarosaLicensed
| Name | Mark Larosa |
| License number | 03238 |
| License type | Septic System Installer |
| License status | Active — NH DES Designer/Installer roster |
| Based in | Concord, New Hampshire 03301 |
| Phone | (603) 225-8445 |
"Based in" is the city on the business's state 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
- 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 New Hampshire's official licensing records; we do not vouch for the business itself. Before hiring, look up license #03238 directly with the state, 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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