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Treating Plant Certification

Wood preservation owners and operators share with all Canadians the responsibility of maintaining the integrity of our environment, now and for the future. In the spirit of environmental responsibility and sustainable development, the Canadian Wood Preservation Certification Authority (CWPCA) was created to ensure that treating plants maintain environmentally responsible practices in plant design and operation. CWPCA certified plants endorse a set of principles to govern their attitude and action in environmental matters including a commitment to “assess, plan, construct and operate facilities in compliance with all applicable environmental regulations”.

The CWPCA ensures that certified plants respect and fulfill the demands and requirements outlined by Environment Canada’s Technical Recommendations Document for the Design and Operation of Wood Preservation Facilities (TRD).

Currently, all of the plants operating in Canada are certified under the CWPCA program. Plants are re-certified annually on completion of a successful audit of environmental and worker safety practices.


The CWPCA certification program was created to include all treated wood manufacturers, regardless of the preservative chemicals used. A yearly certification is assigned to individual facilities following a complete audit process, which includes plant design and operational practices.

The certification program does not include any federal or provincial regulatory, environmental and worker health programs other than the recommendations from the Strategic Options Process of Environment Canada (1999).

Wood Preservation Canada strongly encourages buyers of treated wood products to purchase from wood preservation plants that are certified under the CWPCA program.

Should you have any questions about the program, please contact your treated wood supplier or Wood Preservation Canada for more information.cwpca logo

List of CWPCA Certified Plants In Canada

A short video explaining the CWPCA Program : See the video


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