| Company | Location | Certifications | License # |
|---|---|---|---|
| Ben Soloman | — | Installer (Level Basic) | 39478 |
| Ed Bellm Plumbing Co | St. Louis, MO | Installer (Level Advanced) | 31972 |
| Jtl | St. Charles, MO | Installer (Level Basic) | 37440 |
| Mick Mehler And Sons, Inc | Silex, MO | Installer (Level Basic) | 34967 |
| Mick Mehler And Sons, Inc | Silex, MO | Installer (Level Advanced) | 34966 |
| Shay Noa Construction Llc | Lake Saint Louis, MO | Installer (Level Basic) | 37378 |
| Stl Sewer Cams Llc | Barnhart, MO | Installer (Level Basic) | 38766 |
7 companies in the Missouri DHSS registered OWTS installer list are based in St Charles County as of 2026-07-23. Companies based elsewhere in Missouri also commonly serve the county.
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