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Everything you need to know about Western preserved wood is just a click away with the Preserved Wood Tech Library at PreservedWood.org.

The online library offers an extensive collection of downloadable publications, technical sheets and design tools to properly select, specify and use Western preserved wood on almost any project.

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Treater Members

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
Bell Lumber & Pole Company, New Brighton, MN
Brisco Wood Preservers Ltd., Brisco, BC
Brooks Manufacturing Co., Bellingham, WA
California Cascade Industries, Sacramento, CA
Conrad Forest Products, North Bend, OR
Durawood (TrueGuard, LLC), Coos Bay, OR
Exterior Wood, Inc., Washougal, WA
Fontana Wood Preserving, Inc., Fontana, CA
Hughes Brothers, Inc., Seward, NB
J.H. Baxter & Co, San Mateo, CA
Marks-Miller Post & Pole, Inc, Clancy, MT
McFarland Cascade, Tacoma, WA
The Oeser Company, Bellingham, WA
Pacific States Treating, Weed, CA
Permapost Products, Hillsboro, OR
Royal Pacific Industries, McMinnville, OR
Stella-Jones, Inc., New Westminster, B.C.
Superior Wood Treating, Sumner, WA
Thunderbolt Wood Treating, Riverbank, CA
TrueGuard, Ukiah, CA
Utah Wood Preserving Company, Salt Lake City, UT
Western Wood Preserving Co., Sumner, WA
Western Wood Treating, Woodland, CA
Wheeler Lumber, LLC, Whitewood, SD