| AA PLUMBING | FAIRFIELD | JAKE DANKERT | 513-758-6237 |
| ABC ENGINEERS AND SURVEYORS, LLC | WASHINGTON COURTHOUSE | JASON LITTLE | 740-463-9446 |
| AREA WIDE SEPTIC AND SERVICE | SABINA | PERRY SHOEMAKER | 937-453-2656 |
| BAKER'S EXCAVATING | NEW VIENNA | BLAKE BAKER | 937-302-6794 |
| CINDACO DESIGN | CINCINNATI | MIKE MORRIS | 513-909-4768 |
| CJ SEPTIC DESIGN | HAMILTON | CHRISTIAN GUFFEY | 513-805-2499 |
| CLEARWATER DESIGN | LEBANON | LUKE MILLER | 937-689-0384 |
| CLEAR CREEK ENVIRONMENTAL, INC. | LEBANON | DAN MICHAEL | 513-934-1040 |
| COPAS CONSTRUCTION | HARVEYSBURG | CHRIS COPAS | 937-623-8676 |
| CS GRUTER LLC | MORROW | CHRISTOPHER GRUTER | 513-833-5814 |
| DARIN COZATT | TROY | DARIN COZATT | 937-459-0139 |
| DC ENGINEERING & CONSULTING, LLC | WEST UNION | JUSTIN DeMINT | 937-544-3112 |
| STAR SEPTICS & EXCAVATION | FAYETTEVILLE | DAVID DUNFORD | 513-334-9632 |
| DEAN THARR ENTERPRISES LLC | CLARKSVILLE | DEAN THARR | 937-289-2551 |
| GROUNDWORKS EXCAVATING & SEPTIC | FAIRBORN | BROOKS BITEMAN | 937-684-7781 |
| MARSHALL ENVIRONMENTAL CONSULTING & DESIGN | MARYSVILLE | WYATT MARSHALL | 937-243-2574 |
| MY DIRT WORKS | MIDLAND | JOHN BURRIS | 513-545-2122 |
| PORGINSKI EXCAVATING | MORROW | TRENT PORGINSKI | 513-543-6819 |
| ROBERT CAUGHRON, RS | SPRINGBORO | ROBERT CAUGHRON | 937-474-2231 |
| SANITARY SEPTIC & EXCAVATION | MIDDLETOWN | DALTON DAVIS | 513-335-4830 |
| SCS ENGINEERS | CINCINNATI | DAN BRENNAN | 513-421-5353 |
| SMALLWOOD SEPTIC & EXCAVATING, LLC | HAMILTON | TIM RENNEKER | 513-844-1717 |
| STREAMKEY | CINCINNATI | RONALD McADAMS | 513-792-1221 |
| TRIPLE A PRO SERVICES | FRANKLIN | TIM DeHART | 937-746-6361 |
| VIOX SEPTIC DESIGN | MORROW | JACKIE VIOX | 513-760-2014 |
