Chromated Copper Arsenate (CCA):
Consumer Safety Information Sheet:
Inorganic Arsenical Pressure-Treated Wood
CCA Table of Contents
Risk Assessments & Reviews
Report an Incident
Contacts for CCA Information
For More Information
[Including Chromate Copper Arsenate (CCA), Ammoniacal Copper Arsenate
Ammoniacal Copper Zinc Arsenate(ACZA)]
This wood has been preserved by pressure-treatment with an EPA-
registered pesticide containing inorganic arsenic to protect it from
insect attack and decay. Wood treated with inorganic arsenic should be
used only where such protection is important.
Inorganic arsenic penetrates deeply into and remains in the pressure-
treated wood for a long time. However, some chemical may migrate from
treated wood into surrounding soil over time and may also be dislodged
from the wood surface upon contact with skin. Exposure to inorganic
arsenic may present certain hazards. Therefore, the following
precautions should be taken both when handling the treated wood and in
determining where to use or dispose of the treated wood.
All sawdust and construction debris should be cleaned up and disposed
of after construction.
Do not use treated wood under circumstances where the preservative may
become a component of food or animal feed. Examples of such sites
would be use of mulch from recycled arsenic-treated wood, cutting
boards, counter tops, animal bedding, and structures or containers for
storing animal feed or human food.
Only treated wood that is visibly clean and free of surface residue
should be used for patios, decks and walkways.
Do not use treated wood for construction of those portions of beehives
which may come into contact with honey.
Treated wood should not be used where it may come into direct or
indirect contact with drinking water, except for uses involving
incidental contact such as docks and bridges.
Treated wood should not be burned in open fires or in stoves,
fireplaces, or residential boilers because toxic chemicals may be
produced as part of the smoke and ashes. Treated wood from commercial
or industrial use (e.g., construction sites) may be burned only in
commercial or industrial incinerators or boilers in accordance with
state and Federal regulations. CCA-treated wood can be disposed of
with regular municipal trash (i.e., municipal solid waste, not yard
waste) in many areas. However, state or local laws may be stricter
than federal requirements. For more information, please contact the
waste management agency in your state, which you can find at
Avoid frequent or prolonged inhalation of sawdust from treated wood.
When sawing, sanding, and machining treated wood, wear a dust mask.
Whenever possible, these operations should be performed outdoors to
avoid indoor accumulations or airborne sawdust from treated wood.
When power-sawing and machining, wear goggles to protect eyes from
Wear gloves when working with the wood. After working with the wood,
and before eating, drinking, toileting, and use of tobacco products,
wash exposed areas thoroughly.
Because preservatives or sawdust may accumulate on clothes, they
should be laundered before reuse. Wash work clothes separately from
other household clothing.