OSS Professional Installer List
This list is a list of companies that are licensed by Cowlitz County to install septic systems. Cowlitz County does not endorse, guaranty, or warranty the workmanship of any of these companies or individuals.
Do Your Homework
As with any professional you hire, do your homework. The County is not able to give suggestions or references. If you have any complaints concerning one of these companies please report them to the Environmental Health Unit (EHU) at 360-414-5599, email at omseptic@co.cowlitz.wa.us, or fill out a Request for Investigation form and submit it to Health & Human Services.
| Business Name | Name | Mail Address | City, State, Zip | Phone |
| A-ACTION GROUP UTILITIES INC | POTTER, BENNETT | 620 93RD AVE | OLYMPIA, WA 98501 | 360-943-9200 |
| ADRENALINE SERVICES LLC | HOMOLA, RYAN | 7115 NE 209TH ST | BATTLE GROUND, WA 98604 | 360-831-7656 |
| ADVANCE SEWER & DRAIN | FLETCHER, BRIAN | PO BOX 1831 | LONGVIEW, WA 98632 | 360-578-2831 |
| AMOS EXCAVATING/ CONSTRUCTION | AMOS, LUKE | 366 DELAMETER RD | CASTLE ROCK, WA 98611 | 360-749-3330 |
| BLOOMQUIST SEPTIC INSPECTIONS LLC | ROBERTS, PETER | PO BOX 3008 | BATTLE GROUND, WA, 98604 | 360-686-0011 |
| BUCK & SONS CONSTRUCTION LLC | BUCK, JASON | 220 WALLACE RD | WOODLAND, WA 98674 | 360-225-8044 |
| CARNEY CONSTRUCTION INC | CARNEY, ARTHUR | PO BOX 327 | TOUTLE, WA 98649 | 360-274-7980 |
| CHILTON EXCAVATION | RICHARDS, KEITH | 1760 DOWN RIVER DR | WOODLAND, WA 98674 | 360-225-4857 |
| CLARK COUNTY SEPTIC SYSTEMS LLC | KIRKELIE, KEN | 21506 NW 31ST AVE | RIDGEFIELD, WA 98642 | 360-887-1800 |
| D B & R INC. | YOUNG, DAVE | 1149 RUSH RD | CHEHALIS, WA 98532 | 360-269-3877 |
| DOWNHILL EXCAVATION & DRAIN SERVICE | DALKE, LANCE | PO BOX 103 | KALAMA, WA 98626 | 360-989-5238 |
| EARTHWORKS EXCAVATING SERVICES INC | WIARD, MATT | PO BOX 821624 | VANCOUVER, WA 98682 | 360-772-0088 |
| HORIZONS NW EXCAVATING & SEPTIC LLC | JAYNES, JOSH | 16617 NE 197TH AVE | BRUSH PRAIRIE, WA 98606 | 360-798-1115 |
| HOWDYS DOODY SERVICE INC | LESMAN, CHRIS | 620 93RD AVE, SE | OLYMPIA, WA 98501 | 360-584-9936 |
| JEFFRIES REPAIR AND SEPTIC | JEFFRIES, STEVE | PO BOX 901 | CASTLE ROCK, WA 98611 | 360-430-6891 |
| J.P. HUHTA UNDERGROUND LLC | HUHTA, JEAN-PAUL | PO BOX 1001 | LONGVIEW, WA 98632 | 360-751-5734 |
| KRONE TRUCKING | KRONE, JEFF | 161 RIVERVIEW DRIVE | CASTLE ROCK, WA 98611 | 360-957-3322 |
| EHC CONSTRUCTION | TINKESS, CHRIS | 540 OLEQUAH HTS RD | CASTLE ROCK, WA 98611 | 541-749-7541 |
| L&S CONTRACTORS | ROTSCHY, BASIL F | 22405 NE WH GARNER RD | YACOLT, WA 98675 | 360-686-3827 |
| NW CONSTRUCTION GENERAL CONTRACT | BECKER, DEVIN | 22317 NE 72ND AVE | BATTLE GROUND, WA 98604 | 360-687-2040 |
| NORTHWEST CASCADE INC | CUSHMAN, ADAM | PO BOX 73399 | PUYALLUP, WA 98374 | 253-848-2371 |
| NORTHWEST SITEWORKS INC | TAPANI, NICK | PO BOX 699 | BATTLE GROUND, WA 98604 | 360-772-4348 |
| PACIFIC SITEWORKS LLC | POSEY, BRANDON R. | PO BOX 821394 | VANCOUVER, WA 98682 | 360-241-0849 |
| RICH ENTERPRISES KALAMA LLC | RICH, MATT | PO BOX 507 | KALAMA, WA 98625 | 360-927-9045 |
| ROBB CONSTRUCTION INC | ROBB, BRET | 7209 NE 159TH STREET | VANCOUVER, WA 98662 | 360-573-3030 |
| SAM LONGTAIN CONSTRUCTION | LONGTAIN, SAM | 335 ELOCHOMAN VALLEY RD | CATHLAMET, WA 98612 | 360-957-0503 |
| SEPPANEN CONSTRUCTION LLC | JUSSILA, SAM | 27208 NE 10TH AVE, UNIT 110 | RIDGEFIELD, WA 98642 | 360-263-7950 |
| SEPPANEN CONSTRUCTION LLC | MYLLYMAKI, LUKE | 27208 NE 10TH AVE, UNIT 110 | RIDGEFIELD, WA 98642 | 360-263-7950 |
| SEPPANEN CONSTRUCTION LLC | SEPPANEN, BRIAN | 27208 NE 10TH AVE, UNIT 110 | RIDGEFIELD, WA 98642 | 360-263-7950 |
| SPENCER’S TRUCKING & EXCAVATING INC | SPENCER, TOM | 2780 PACIFIC AVE N | KELSO, WA 98626 | 360-577-8828 |
| SPENCER’S TRUCKING & EXCAVATING INC | SPENCER, TONY | 2780 PACIFIC AVE N | KELSO, WA 98626 | 360-577-8828 |
| WEST COAST CONSTRUCTION LLC | MCCLELLAN, KEVIN | 553 UPPER NASELL RD | NASELLE, WA 98638 | 360-907-1914 |