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Treated Wood

Treated Wood Disposal

Treated Wood Waste Disposal

The Marin Household Hazardous Waste facility cannot accept treated wood waste (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 2
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.

What doesn’t qualify as treated wood?

  • Natural wood with no chemical preservatives.
  • Natural wood coated in paint or surface finish such as lacquer, shellac, polyurethane and varnish.
Zero Waste in Marin

Zero Waste in Marin

Zero Waste Marin is the formal name for the Marin Hazardous and Solid Waste Joint Powers Authority (JPA), which is comprised of representatives from all over Marin County.

Their mission is to help residents and businesses meet the county’s Zero Waste goal by 2025 by reducing and recycling their solid waste and safely disposing of hazardous materials. They provide information on household hazardous waste collection, recycling, composting and waste disposal and their website is full of useful information. They also ensure our county’s compliance with state recycling mandates – all while educating the citizens and businesses of Marin.


Zero Waste Marin is comprised of the city and town managers of Belvedere, Corte Madera, Fairfax, Larkspur, Mill Valley, Novato, Ross, San Anselmo, San Rafael, Sausalito and Tiburon and the County of Marin. Zero Waste Marin ensures Marin’s compliance with the California Integrated Waste Management Act and its waste reduction mandates.


In addition to addressing the statutory requirements of the Integrated Waste Management Act, Zero Waste Marin also works with us at the Marin Household Hazardous Waste Facility to provide hazardous waste collection to citizens and businesses in all areas of Marin except for the City of Novato.

Learn more at


Refillable is better

Refillable Cylinders

In North America, 40 million disposable one-pound propane cylinders are used and tossed out each year with an estimated four million in California alone!


Empty cylinders are often disposed of improperly in landfills, dumpsters, household trash, campsites, on the roadside or in recycling containers and proper recycling is costly. When “empty,” disposable cylinders often still contain a small amount of gas, posing a danger to sanitation and parks workers due to the risk of explosions and resulting fires.


Refillable cylinders! Refillables save money and hassle, they cost from $1.99 to $3.99 to refill (depending on location) because you only pay for the gas and filling service, not the container, they last up to 12 years and can be refilled hundreds of times.

Learn more at