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Wood Treated with Preservatives

Treated wood is banned from disposal in the garbage.
Most Sonoma County Refuse Disposal Sites do not accept treated wood for disposal. All wood treated with preservatives is subject to California's Hazardous Waste Control Law and may only be accepted at approved facilities.

Treated wood refers to dimensional lumber treated with chemicals that protect wood from rotting due to insects and microbial agents. Chemicals include arsenic, chromium, copper, creosote and pentachlorophenol which are hazardous to humans and the environment. Identification is not difficult as long as you know the characteristics.

How to identify treated wood
Look on the surface of the wood for small slits. These are numerous, staggered along the board and look like staple slits. They help with deeper chemical penetration and retention. Most pressure-treated wood has these slits. Examine the wood especially the edges, for a green tint. When the lumber is young, this will be the most identifiable sign of pressure-treated wood. As it ages it will fade to a dull gray color.

Examples of pressure treated wood preservative include:

CCA (Chromated copper arsenate)
Common uses: sill plates, trusses, joists

Common uses: railroad ties

Common uses: phone poles, some fence posts

Copper based such as alkaline copper quaternary (ACQ) and copper boron azole (CBA)
Common uses: decking, landscape timbers

Common uses: sill plates, trusses, joists

Other wood preservatives

Resources for treated wood recycling

Department of Toxics Substances Control Board

California Department of Resources Recycling and Recovery (CalRecycle)

Hours listed on this page may change without notice.

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  • Board Meetings
  • Conferences and Workshops
  • E-Waste
  • Household Hazardous Waste
  • Mattress Recycling
  • Other
  • Outreach
  • Disposal Site


Altamont Landfill & Resource Recovery Facility

10840 Altamont Pass Rd., Livermore CA 94551

NotesDrop-off and fee: all kinds; visit website for instructions.

Central Disposal Site

500 Mecham Rd
Petaluma, CA 94952

NotesDrop-off and fee: pressure treated, railroad ties, telephone poles (less than 7 feet). Nails/screws okay, remove metal fasteners.

For current rates, see Fee Schedule

Forward Inc. & Austin Rd. Landfills

9999 South Austin Rd.
Manteca, CA 95336

NotesDrop-off and fee: all kinds; call for quote.

Keller Canyon Sanitary Landfill (Republic Services)

901 Bailey Rd.
Pittsburg, CA 94565

NotesDrop-off and fee: all kinds; call for instructions and quote.

Pacific Sanitation

590 Caletti Ave
Windsor, CA 95492

NotesDrop-off, pickup and fee: all kinds; call for quote.

Potrero Hills Landfill

3675 Potrero Hills Ln.
Suisun, CA 94585

NotesDrop-off and fee: all kinds; prior approval required for commercial loads.

Recology Hay Road Landfill

6426 Hay Rd.
Vacaville, CA 95687

NotesDrop-off and fee: all kinds.

Republic Services/Global Materials Recovery Services

3899 Santa Rosa Ave
Santa Rosa, CA 95407

NotesDrop-off and fee: all kinds, call for quote.

Republic Services/Industrial Carting

3911 Santa Rosa Ave.
Santa Rosa, CA 95407

NotesPickup and fee: all kinds.