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Copper chrome arsenate (CCA) is a water-borne solution of up to 25% copper, up to 45% chromium and up to 37% arsenic. This treatment makes the timber highly resistant to pests and fungi but it can also be toxic when handled or burnt, and should never be used for household building or renovation.

In NSW, the EPA monitors the use of chemicals involved in treating timber, sets standards for responsible use of timber treatments and regulates the wood preservation industry.

Brands and labels on timber preserved to Australian Standards help buyers and users identify which company manufactured it, the treatment used and its hazard level. Special labelling is required for timber treated with copper chrome arsenate (CCA).