WWPI Treaters are the core members of the Institute. Located throughout the 17 Western states and in two Canadian provinces, these treating companies produce a variety of preservative-treated wood products, from utility poles and marine pilings to sawn lumber, timbers and glu-lam beams.
There are two levels of Treater membership: Full Treater and Limited Treater. Full Treater membership is open to any company producing pressure-treated wood products with more than one pressure cylinder and more than one type of treatment. Limited Treater membership if for companies with a single pressure cylinder and a single type of treatment.
For information on Treater membership, contact WWPI Executive Director Dallin Brooks at 360-693-9958. To review the preservatives used by Treater members, download the Sources of Supply publication.
Allweather Wood, Washougal, WA
AmeriTies West, LLC, The Dalles, OR
Arizona Log & Timberworks, Eager, AZ
Bell Lumber & Pole Company, New Brighton, MN
Brisco Wood Preservers Ltd., Brisco, BC
Brooks Manufacturing Co., Bellingham, WA
CanWel Building Materials Group, Ltd.
- California Cascade Industries, Fontana, CA
- Oregon Cascade Industries, Junction City, OR
- Honsador, Hawaii (mulitple locations)
Chemco, Inc., Ferndale, WA
Conrad Forest Products, North Bend, OR
Fontana Wood Preserving, Inc., Fontana, CA
Hughes Brothers, Inc., Seward, NB
J.H. Baxter & Co, San Mateo, CA
Koppers, Inc., Denver, CO
Marks-Miller Post & Pole, Inc, Clancy, MT
The Oeser Company, Bellingham, WA
Pacific States Treating, Weed, CA
Permapost Products, Hillsboro, OR
Princeton Wood Preservers, Ltd., Princeton, BC
Royal Pacific Industries, McMinnville, OR
Stella-Jones, Inc., New Westminster, B.C.
Superior Wood Treating, Sumner, WA
Taiga Exterior Wood, Inc., Washougal, WA
Thunderbolt Wood Treating, Riverbank, CA
TrueGuard, Ukiah, CA
Utah Wood Preserving Company, Salt Lake City, UT
Western Wood Preserving Co., Sumner, WA
Wheeler Lumber, LLC, Whitewood, SD