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.


ContactCompany Name
AddressCity, State, Zip
Phone #
AMOS, LUKE
AMOS EXCAVATING/ CONSTRUCTION
366 DELAMETER RD
CASTLE ROCK, WA 98611
360-749-3330
BECKER, DEVINNW CONSTRUCTION GENERAL CONTRACT22317 NE 72ND AVEBATTLE GROUND, WA 98604360-687-2040
BUCK, JASON
BUCK & SONS CONSTRUCTION LLC
220 WALLACE RD
WOODLAND, WA 98674
360-225-8044
CAMPUZANO, RON
DIRT MASTERS LLC
PO BOX 484
WASHOUGAL, WA 98671
541-400-1136
CARNEY, ARTHUR
CARNEY CONSTRUCTION INC
PO BOX 327
TOUTLE, WA 98649
360-274-7980
CASEDAY, JUSTINCASEDAY SEPTIC SERVICES LLC21212 NE 72ND AVEBATTLE GROUND, WA 98604360-931-0859
CUSHMAN, ADAM
NORTHWEST CASCADE INC
PO BOX 73399
PUYALLUP, WA 98374
253-848-2371
DALKE, LANCEDOWNHILL EXCAVATION & DRAIN SERVICE
PO BOX 103
KALAMA, WA 98626
360-989-5238
HAMMERSTROM, DANIELGLACIER INDUSTRIES LLCPO BOX 614YACOLT, WA 98675360-989-5500
HEIM, CLARKAXIUM EXCAVATION LLC241 ROBERTSON RDLONGVIEW, WA 98632360-431-5759
HOMOLA, RYANADRENALINE SERVICES LLC7115 NE 209TH STBATTLE GROUND, WA 98604360-831-7656
HUHTA, JEAN-PAUL
J.P. HUHTA UNDERGROUND LLC
PO BOX 1001
LONGVIEW, WA 98632
360-751-5734
JAYNES, JOSHHORIZONS NW EXCAVATING & SEPTIC LLC16617 NE 197TH AVEBRUSH PRAIRIE, WA 98606360-798-1115
JEFFRIES, STEVEJEFFRIES REPAIR AND SEPTICPO BOX 901CASTLE ROCK, WA 98611360-430-6891
JUSSILA, SAMSEPPANEN CONSTRUCTION LLC27208 NE 10TH AVE, UNIT 110
RIDGEFIELD, WA 98642
360-263-7950
KIRKELIE, KEN
CLARK COUNTY SEPTIC SYSTEMS LLC
21506 NW 31ST AVE
RIDGEFIELD, WA 98642
360-887-1800
KRONE, JEFFKRONE TRUCKING161 RIVERVIEW DRIVECASTLE ROCK, WA 98611360-957-3322
LESMAN, CHRISHOWDYS DOODY SERVICE INC620 93RD AVE, SEOLYMPIA, WA 98501360-584-9936
LONGTAIN, SAM
SAM LONGTAIN CONSTRUCTION
335 ELOCHOMAN VALLEY RD
CATHLAMET, WA 98612
360-957-0503
MCCAIN, DANMCCAIN CONSTRUCTION & DEVELOPMENT205 RUGER LANECHEHALIS, WA 98532360-520-6595
MERRIMAN, BRITTGLACIER INSTUSTRIES LLCPO BOX 614YACOLT, WA 98675360-773-7719
MYLLYMAKI, LUKE
SEPPANEN CONSTRUCTION LLC
27208 NE 10TH AVE, UNIT 110
RIDGEFIELD, WA 98642
360-263-7950
POSEY, BRANDON R.PACIFIC SITEWORKS LLCPO BOX 821394VANCOUVER, WA 98682360-241-0849
POTTER, BENNETT
A-ACTION GROUP UTILITIES INC
620 93RD AVE
OLYMPIA, WA 98501
360-943-9200
RICH, MATTRICH ENTERPRISES KALAMA LLCPO BOX 507KALAMA, WA 98625360-927-9045
RICHARDS, KEITHCHILTON EXCAVATION1760 DOWN RIVER DRWOODLAND, WA 98674360-225-4857
ROBERTS, PETERBLOOMQUIST SEPTIC INSPECTIONS LLCPO BOX 3008BATTLE GROUND, WA, 98604360-686-0011
ROBB, BRETROBB CONSTRUCTION INC7209 NE 159TH STREETVANCOUVER, WA 98662360-573-3030
ROTSCHY, BASIL F
L&S CONTRACTORS
22405 NE WH GARNER RD
YACOLT, WA 98675
360-686-3827
SEPPANEN, BRIAN
SEPPANEN CONSTRUCTION LLC
27208 NE 10TH AVE, UNIT 110
RIDGEFIELD, WA 98642
360-263-7950
SPENCER, TOM
SPENCER’S TRUCKING & EXCAVATING INC
2780 PACIFIC AVE N
KELSO, WA 98626
360-577-8828
SPENCER, TONY
SPENCER’S TRUCKING & EXCAVATING INC2780 PACIFIC AVE N
KELSO, WA 98626
360-577-8828
TAPANI, NICK
NORTHWEST SITEWORKS INC
PO BOX 699
BATTLE GROUND, WA 98604
360-772-4348
TINKESS, CHRISLPH INC540 OLEQUAH HTS RDCASTLE ROCK, WA 98611360-396-7051
WIARD, MATT
EARTHWORKS EXCAVATING SERVICES INC
PO BOX 821624
VANCOUVER, WA 98682
360-772-0088
YOUNG, DAVED B & R INC.1149 RUSH RDCHEHALIS, WA 98532360-269-3877