| Company | Location | Certifications | License # |
|---|---|---|---|
| A & S Landscape Construction Inc | Valley Center, CA | Installer (C-42) | 1101324 |
| A O Reed & Co Llc | San Diego, CA | Installer (C-42) | 7731 |
| A1 Septic Services | El Cajon, CA | Installer (C-42) | 1080434 |
| Ads Consulting | Descanso, CA | Installer (C-42) | 1119362 |
| Advanced Septic Systems Llc | La Mesa, CA | Installer (C-42) | 1152708 |
| Akae Builder | San Diego, CA | Installer (C-42) | 1008370 |
| All In Pumping & Septic Inc | Ramona, CA | Installer (C-42) | 1097773 |
| All Terrain Backhoe Service | Fallbrook, CA | Installer (C-42) | 880756 |
| Anytime Septic Service Inc | Santee, CA | Installer (C-42) | 1145830 |
| Api Builders Inc | Fallbrook, CA | Installer (C-42) | 844420 |
| Bmb Septic Company | La Mesa, CA | Installer (C-42) | 494826 |
| Bob'S Septic Service | Escondido, CA | Installer (C-42) | 1115212 |
| Center Septic | Valley Center, CA | Installer (C-42) | 1051607 |
| County Digging Septic | Alpine, CA | Installer (C-42) | 1117321 |
| Draves Pipeline Incorporated | Bonsall, CA | Installer (C-42) | 376472 |
| Easy Flow Drains Inc | Poway, CA | Installer (C-42) | 1033798 |
| Jims Appollo Septic Inc | Poway, CA | Installer (C-42) | 949210 |
| Matthew 724 Construction Inc | Poway, CA | Installer (C-42) | 1135712 |
| Merritt B H | Carlsbad, CA | Installer (C-42) | 291323 |
| Mineo Bros Septic Service | Spring Valley, CA | Installer (C-42) | 940891 |
| Pacific Sewer Maintenance Corp | Oceanside, CA | Installer (C-42) | 904921 |
| Palladino Travis Construction | La Mesa, CA | Installer (C-42) | 811195 |
| Pauma Storm Water And Sewer Systems Inc | Escondido, CA | Installer (C-42) | 1061975 |
| R & G Redding Construction | Valley Center, CA | Installer (C-42) | 833256 |
| Reed Philip R | Encinitas, CA | Installer (C-42) | 720356 |
| Rittenhouse Construction | Ramona, CA | Installer (C-42) | 314838 |
| Roto-Rooter Plumbers | Vista, CA | Installer (C-42) | 966412 |
| S D Drilling Inc | Ramona, CA | Installer (C-42) | 958254 |
| San Diego Backflow Testing | San Diego, CA | Installer (C-42) | 1054091 |
| San Diego Septic Systems | Campo, CA | Installer (C-42) | 835378 |
| Septic Repair Service | La Mesa, CA | Installer (C-42) | 1025242 |
| Sewer Stormers | Lakeside, CA | Installer (C-42) | 1136147 |
| Solid State Septic | Ramona, CA | Installer (C-42) | 1128200 |
| Sunland Sewer Company | Vista, CA | Installer (C-42) | 1088960 |
| Total Terrain Savvy Inc | Valley Center, CA | Installer (C-42) | 916278 |
| Troy Plumbing And Repairs Inc | San Diego, CA | Installer (C-42) | 1047611 |
| Waterwerx Inc | San Marcos, CA | Installer (C-42) | 1118115 |
37 companies in the CSLB Licensed C-42 Sanitation System Contractors are based in San Diego County as of 2026-07-23. Companies based elsewhere in California also commonly serve the county.
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