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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 or email or you can fill out our Request for Investigation form and submit it to Health & Human Services.

Contact Company Name
Address City, State, Zip
Phone #
AMOS, LUKE
AMOS EXCAVATING/ CONSTRUCTION
366 DELAMETER RD
CASTLE ROCK, WA 98611
360-749-3330
BUCK, JASON
BUCK CONSTRUCTION
220 WALLACE RD
WOODLAND, WA 98674
360-225-8044
CARNEY, ARTHUR
CARNEY CONSTRUCTION
PO BOX 327
TOUTLE, WA 98649
360-274-7980
CHENIER, MATT J & B CHENIER SEPTIC SERVICES PO BOX 1173 KELSO, WA 98626 360-261-1674
ENDRES, CHRIS
SEPPANEN CONSTRUCTION LLC
8207 NE 316TH ST
LACENTER, WA 98629
360-263-7950
HUHTA, JEAN-PAUL
J.P. HUHTA UNDERGROUND LLC
PO BOX 1001
LONGVIEW, WA 98632
360-751-5734
HURST, JOHN ENVIROTECH SEPTIC SOLUTIONS LLC 12627 183RD AVE SW ROCHESTER, WA 98579 360-273-3840
JENSEN, KELLY DJ'S PLUMBING LLC 2619 FORON RD CENTRALIA, WA 98531 360-736-6444
KRONE, JEFF KRONE TRUCKING 161 RIVERVIEW DRIVE CASTLE ROCK, WA 98611 360-957-3322
LEE, MATT AQUA TEST INC 28620 MAPLE VALLEY BLACK DIAMOND RD SE MAPLE VALLEY, WA 98038 800-221-3159
LEE, SCOTT
SCOTT LEE EXCAVATING INC
PO BOX 2123
BATTLE GROUND, WA 98604
360-687-5465
LONGTAIN, SAM
SAM LONGTAIN CONSTRUCTION
PO BOX 434
CATHLAMET, WA 98612
360-957-0503
MATSON, KEVIN DIGGIN DIRT EXCAVATING PO BOX 705 AMBOY, WA 98601 360-852-4611
POTTER, BENNETT
A-ACTION GROUP UTILITIES INC
620 93RD AVE
OLYMPIA, WA 98501
360-943-9200
RICHARDS, KEITH RICHARDS EXCAVATION LLC 1319 HEMLOCK ST LONGVIEW, WA 98632 360-957-3434
ROBERTS, PETER LAND RENOVATORS INC 28120 NE THOMPSON CIRCLE YACOLT, WA 98675 360-607-3662
ROBERTS, PETER MTI CONTRACTORS INC 916 SE 3RD AVE BATTLE GROUND, WA, 98604 360-798-4970
ROBB, BRET ROBB CONSTRUCTION INC 7209 NE 159TH STREET VANCOUVER, WA 98662 360-573-3030
ROTSCHY, BASIL F
L&S CONTRACTORS
22405 NE WH GARNER RD
YACOLT, WA 98675
360-686-3827
SEPPANEN, BRIAN
SEPPANEN CONSTRUCTION LLC
8207 NE 316TH ST
LA CENTER, WA 98629
360-263-7950
SPENCER, TOM
SPENCER'S TRUCKING & EXCAVATING INC
102 SALE BARN RD
KELSO, WA 98626
360-577-8828
SPENCER, TONY
SPENCER'S TRUCKING & EXCAVATING INC 102 SALE BARN RD
KELSO, WA 98626
360-577-8828
TAPANI, PAUL
NORTHWEST SITEWORKS INC
PO BOX 699
BATTLE GROUND, WA 98604
360-772-4352
WALIEZER, DALE
AAA SEPTIC SERVICE
PO BOX 1688
BRUSH PRAIRIE, WA 98606
360-687-8960
WIARD, MATT
EARTHWORKS EXCAVATING SERVICES INC
PO BOX 821624
VANCOUVER, WA 98682
360-772-0088
YOUNG, DAVE D B & R INC. 1149 RUSH RD CHEHALIS, WA 98532 360-269-3877


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