What is the status of using CCA as a wood treatment?

The correct answer pertains to the use of chromated copper arsenate (CCA) as a wood treatment, which is indeed discontinued for most residential applications due to health and environmental concerns. CCA has been primarily used to protect wood from rot and pests, but its arsenic content raises significant health risks, particularly in settings involving children or where the wood may come into contact with food.

While CCA has been phased out for general residential use, it remains permissible for certain specific applications, such as in agricultural use or certain industrial settings, where guidelines are closely regulated to ensure safety. This allows for its continued utility in contexts where other treatments may not suffice or where durability is a critical concern.

In contrast, the other options misrepresent the status of CCA. It has not been entirely banned for all uses, which would imply that it could not be employed under any circumstances, nor is it limited only to outdoor furniture. Therefore, understanding the nuanced regulations surrounding CCA is crucial for professionals in the home inspection and construction fields.