GroundRosterDavid CedarholmLicensed
| Name | David Cedarholm |
| License number | 01422 |
| License type | Professional Engineer, Septic System Designer |
| License status | Active — NH DES Designer/Installer roster |
| Based in | Portsmouth, Rockingham County, New Hampshire 03801 |
| Phone | (603) 436-6192 |
"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.
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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.
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 #01422 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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