GroundRosterRH Knowlton & Sons LLCLicensed
| Name | RH Knowlton & Sons LLC |
| License number | 51408 (inspector) |
| License type | Onsite Soil Evaluator ยท Onsite System Inspector |
| License status | Current registration |
| License expires | 2026-11-30 |
| Based in | Ava, Missouri |
| Counties declared to the state | Douglas, Ozark, Webster, Wright |
| Phone | (417) 543-1255 |
"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
- Site testing: licensed to run percolation tests and evaluate soils to determine what kind of system a site can support.
- Inspection: licensed to inspect existing septic systems; the license you want for a home-purchase inspection.
How to verify this license
We publish the license details exactly as they appear in Missouri's official licensing records; we do not vouch for the business itself. Before hiring, look up license #51408 (inspector) directly with the state, confirm it is still active, and ask for a current certificate of insurance.
Source: Missouri registered onsite soil evaluators + Missouri licensed onsite system inspectors/evaluators, last checked 2026-08-16. Verify at the official source.
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