GroundRosterMark JohnstonLicensed
| Name | Mark Johnston |
| License number | 04296 |
| License type | Septic System Installer |
| License status | Active — NH DES Designer/Installer roster |
| Location | Thornton, New Hampshire 03285 |
Request a quote from Mark Johnston
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 this listing exactly as it appears in New Hampshire's official licensing records; we do not vouch for the business itself. Before hiring, look up license #04296 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.
Are you Mark Johnston? Claim this listing to set your business name and add your website, service area, hours, and photos. It's free.