GroundRosterCharles Walter JonasLicensed
| Name | Charles Walter Jonas |
| License number | OS0004912, OS0010547 |
| License type | OSSF Installer II · OSSF Site Evaluator |
| License status | Current — TCEQ OSSF licensing export (exported 2026-08-17) |
| License expires | 2029-04-30 |
| County | Travis County, Texas |
Request a quote from Charles Walter Jonas
What this license covers
- Site testing: licensed to run percolation tests and evaluate soils to determine what kind of system a site can support.
- 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 Texas's official licensing records; we do not vouch for the business itself. Before hiring, look up license #OS0004912, OS0010547 directly with the state, confirm it is still active, and ask for a current certificate of insurance.
Source: Texas Commission on Environmental Quality (TCEQ) - OSSF occupational licensing, last checked 2026-08-17. Verify at the official source.
Are you Charles Walter Jonas? Claim this listing to show your business name on it. It's free, and we check every claim by hand.