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Missoula Valley Water Quality District
(406) 258-4890
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Missoula Valley Water Quality District

Department: Water Quality District
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Water Quality District - Hazardous Waste

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Treated Wood

What is the Problem?

Treated wood contains chemical preservatives (pesticides) to inhibit fungal decay and extend the life of the wood. The wood-treating industry estimates treated wood will last 20 to 30 times longer than untreated wood in challenging outdoor environments. While treating the wood lengthens its useful life and conserves trees, some of the chemicals used in treating wood are toxic.

Types of Treated Wood:

Chromated Copper Arsenate (CCA)

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Safety Tips

Minimize exposure to your family and children by following these guidelines:

Consumer Tips

Consider alternatives to treated wood when selecting building materials for your next outdoor structure or project:

Disposal Options


The Residential Disposal Guide is provided by the Missoula Valley Water Quality District as a public service and is not an endorsement of specific businesses, services or products. Any omissions or inaccuracies are unintentional. Please contact us with corrections or additions. Call businesses or agencies to confirm hours, locations and charges for services, if any. For information on disposal of items not listed, email or call the Water Quality District at 406-258-4890, M - F, 8 am to 5 pm.

Much of the information provided is from the Washington County, MN, Dept. of Public Health and Environment website.

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