Treated Wood Waste Disposal

The alternative management standard (AMS), which allows waste haulers to accept treated wood waste (TWW) from residential and commercial customers, expires on December 31, 2020.

For this reason, beginning on January 1, 2021, waste haulers in the County of Marin cannot accept TWW at their facilities, in their debris boxes, and in the garbage, recycling, or composting bins as treated wood is now considered hazardous waste.

The Department of Toxic Substances Control (DTSC) is working on some variances that could allow some facilities to receive TWW. Until the variances are applied, DTSC suggests generators delay removing treated wood if possible or temporarily storing the waste before disposal. Currently, the Marin Household Hazardous Waste facility cannot accept TWW from residential or commercial generators. Please, do not bring TWW to the facility, and please do not instruct your customers to do so either. If you must remove any TWW, read the DTSC factsheet to avoid any penalties and get a disposal estimate from an approved hazardous waste hauler. To find more information related to the topic, visit the DTSC website.

What is Treated Wood?

Treated wood is wood that has gone through a treatment process with chemical preservatives to protect it against pests and environmental conditions. Typically, treated wood is used in exterior applications where ground or water contact is likely.

What qualifies as treated wood?

Treated wood means wood that has been treated with a chemical preservative for purposes of protecting the wood against attacks from insects, microorganisms, fungi, and other environmental conditions that can lead to decay of the wood, and the chemical preservative is registered pursuant to the Federal Insecticide, Fungicide, and Rodenticide Act (7 U.S.C. Sec. 136 et seq.). These preservatives often include one or more of the following constituents: arsenic, chromium, copper, pentachlorophenol, and creosote.