GroundRosterJohn H MarksLicensed
| Name | John H Marks |
| License number | L1813 |
| License type | OWTS Installer |
| License status | Active — RIDEM licensed |
| Based in | Tiverton, Rhode Island 02878 |
| Phone | (774) 930-0889 |
"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 Rhode Island's official licensing records; we do not vouch for the business itself. Before hiring, look up license #L1813 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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