GroundRosterJames McMahon IIILicensed
| Name | James McMahon III |
| License number | 01805, 05356 |
| License type | Professional Engineer, Septic System Designer, Septic System Installer |
| License status | Active — NH DES Designer/Installer roster |
| Based in | Littleton, Grafton County, New Hampshire 03561 |
| Phone | (603) 444-2933 |
"Based in" is the city and county of the address on the business's state license record. That can be a mailing address; it doesn't tell you where the business works.
Request a quote from James McMahon III
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 New Hampshire's official licensing records; we do not vouch for the business itself. Before hiring, look up license #01805, 05356 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 James McMahon III? Claim this listing to show your business name on it. It's free, and we confirm every claim before anything changes.