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OSS Designer Professional List
The State of Washington requires that designers of septic systems be licensed by the State. This list represents licensed Wastewater System Designers and Professional Engineers (PE) who are qualified to perform design work in Washington, and have requested their names be added to our list. This list is not a recommendation, endorsement, or guaranty of workmanship by Cowlitz County. Questions, concerns, or comments concerning designers or engineers designing wastewater systems may be directed to the Washington State Department of Licensing (DOL) at 360-664-1568, or by accessing the DOL website at: http://www.dol.wa.gov/business/onsitewastewater/

Do Your Homework
As with any professional you hire, do your homework. The County is not able to give suggestions or references.
Company Name
Licensed Individual
Address City, State, Zip
Phone #
ABC SEPTIC DESIGNS & MAINTENANCE
HAVILAND, DONALD L.
664 DEEP CREEK RD.
CHEHALIS, WA 98532
360-520-1390
ADVANCED ENGINEERING
ELSTROTT, CHRISTOPHER
128 N RIVER ST
MONTESANO, WA 98563
360-249-8447
ADVANCED SEPTIC CONSULTING
BUCK, TRAVIS
220 HANSEN RD
KALAMA, WA 98625
360-433-5476
AQUA RESOURCE DESIGN & CONSULTING LLC
LAMP, BRANNON
3439 NE SANDY BLVD #165
PORTLAND, OR 97232
360-326-8489
ASD2 INC - COLLIER SEPTIC CONSULTING & DESIGN
COLLIER, MARK
PO BOX 1476
BRUSH PRAIRIE, WA 98606
360-798-6456
BRIAN L. HEWITT ENGINEERING
HEWITT, BRIAN L.
3029 MAPLE ST
LONGVIEW, WA 98632
360-751-3751
EK ENGINEERING
EK, NATHAN
PO BOX 3097
BATTLE GROUND, WA 98604
360-687-7668
ENVIRONMENTAL DESIGN LLC.
RIEGER, BECKY
901 L ST
CENTRALIA, WA 98531
360-219-3343
ENVIRONMENTAL MANAGEMENT SYSTEMS
SWEENEY, ROBERT
4080 SE INTERNATIONAL WY #B112
MILWAUKIE, OR 97222
360-735-1109
EVERGREEN SEPTIC DESIGN INC.
WILLIAMS, MIKE
7503 NE 219TH ST
BATTLE GROUND, WA 98604
360-687-9919
MCNAIR SEPTIC DESIGN MCNAIR, CORY S 18915 NE 164TH ST BRUSH PRAIRIE, WA 98606 360-907-1576
WHORTON ENGINEERING
WHORTON, DEAN
426 SEARS RD
WINLOCK, WA 98596
360-785-4329
WILLIAM DENNIS CONSULTANT DENNIS, WILLIAM 526 CLARK CREEK LONGVIEW, WA 98632
360-636-4971


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