GroundRosterMatthew R OlsonLicensed
| Name | Matthew R Olson |
| Company | Mathew R. Olson |
| License number | L0642 |
| License type | OWTS Installer |
| License status | Active — RIDEM licensed |
| Location | Portsmouth, Rhode Island 02871 |
| Phone | (401) 251-4226 |
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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 this listing exactly as it appears in Rhode Island's official licensing records; we do not vouch for the business itself. Before hiring, look up license #L0642 directly with the state, confirm it is still active, and ask for a current certificate of insurance.
Source: Rhode Island Dept. of Environmental Management (RIDEM), last checked 2026-08-17. Verify at the official source.
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