| Company | Location | Certifications | License # |
|---|---|---|---|
| Alf Plumbing Inc | Fresno, CA | Installer (C-42) | 1109556 |
| B & L Mechanical Inc | Fresno, CA | Installer (C-42) | 492481 |
| Big Bore Drilling Certified Septic Co & Hydroflushing | Fresno, CA | Installer (C-42) | 579423 |
| Bray'S Hoe Services | Selma, CA | Installer (C-42) | 1005746 |
| Central State Sanitation | Auberry, CA | Installer (C-42) | 679568 |
| Corea Tom Construction Inc | Fresno, CA | Installer (C-42) | 392288 |
| Dick Donald P Air Conditioning Inc | Fresno, CA | Installer (C-42) | 271615 |
| Drilling Services | Squaw Valley, CA | Installer (C-42) | 921299 |
| J And A Backhoe Service | Orange Cove, CA | Installer (C-42) | 645479 |
| J V H Well & Septic Inc | Clovis, CA | Installer (C-42) | 1090773 |
| Johnston Floyd Construction Co Inc | Clovis, CA | Installer (C-42) | 280281 |
| Kaylen Traffic Control | Friant, CA | Installer (C-42) | 816110 |
| Martinez Plumbing | Clovis, CA | Installer (C-42) | 1068354 |
| Pds Plumbing & Air | Clovis, CA | Installer (C-42) | 1019286 |
| Quirk'S Sierra Pumping Services | Fresno, CA | Installer (C-42) | 1019747 |
| Sequoia Pumping Llc | Fresno, CA | Installer (C-42) | 1136392 |
| Strategic Mechanical Inc | Fresno, CA | Installer (C-42) | 834679 |
| U S Septic Systems | Fresno, CA | Installer (C-42) | 763501 |
18 companies in the CSLB Licensed C-42 Sanitation System Contractors are based in Fresno County as of 2026-07-23. Companies based elsewhere in California also commonly serve the county.
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