History

• Since the 1930s, manufacturers used Chromated Copper Arsenate or "CCA" to pressure treat wood. In 2002, the industry agreed to stop using CCA for wood used around the home since it contains arsenic, which can cause cancer.
  
  

Risks

• Experts disagree on the risks of using CCA-treated wood. The U.S. Consumer Product Safety Commission believes there may be a risk to children who play on playgrounds built with CCA-treated wood. But a University of California study showed fewer cases of cancer during the time builders used the wood. The Environmental Protection Agency maintains pressure-treated wood is not hazardous to the environment or your health if used properly.
  
  

Precautions

• Don't use pressure treated lumber for counter tops, cutting boards or anywhere it could contact food or drinking water.
  
  Always work in a well-ventilated area and wear gloves, goggles and a dust mask.
  
  Never use pressure-treated wood in a fire place or burn outdoors.
  
  Always check local building codes since some states, such as Minnesota, may specifically regulate how you use or dispose of pressure-treated wood.
  
  

Alternatives

• After 2004, manufacturers began using Ammoniacal Copper Quaternary, called "ACQ" or Copper Azole, called "CA", both considered less toxic than CCA.
  
  

Warning

• Oil-based chemicals such as Creosote are still used to treat wood for commercial purposes such as utility poles and railroad ties. Never use them in a home or garden project.