Everyday Materials

CCA-Treated Wood

Science-backed overview of CCA-Treated Wood. Learn key risks, practical exposure-reduction steps, and better alternatives.

Note from the Editor: At Everyday Materials, our goal is to help you navigate the science of your home. We only recommend “Better Alternatives” that we’ve researched extensively and would feel safe using in our own kitchens and lives. If you purchase through one of our links, we may earn a small commission from Amazon at no extra cost to you. This helps us keep the lights on and the research coming. Thank you for trusting us.
Avoid Research-Weighted Household Verdict

Older decking lumber treated with chromated copper arsenate; leaches arsenic.

In This Article
  1. What This Material Is and Where Exposure Happens
  2. Risk Profile and Scientific Context
  3. What You Can Do Right Now
  4. Better Alternatives
  5. Sources

What This Material Is and Where Exposure Happens

CCA-Treated Wood appears in everyday home contexts where exposure can happen through touch, dust, off-gassing, food/water contact, or repeated low-dose use.

Our classification is based on current peer-reviewed and regulatory evidence for realistic household conditions, not extreme edge cases.

Risk Profile and Scientific Context

Current verdict: Older decking lumber treated with chromated copper arsenate; leaches arsenic.

The evidence trend supports minimizing or replacing this material where practical, especially for high-frequency household use.

When studies conflict, we prioritize consistency across human biomonitoring, mechanistic toxicology, and exposure pathway plausibility.

What You Can Do Right Now

Reduce direct exposure opportunities (heat, friction, prolonged contact, and enclosed-space accumulation).

Prefer simpler materials and clearer ingredient disclosure when purchasing replacements.

Phase out high-exposure items first for the best risk reduction per dollar.

Better direction for this material: Cedar or Composite Decking

Better Alternatives

Primary Alternative
Cedar or Composite Decking

Lower-exposure replacement aligned to our catalog guidance.

Immediate practical exposure reduction
Performance/cost tradeoffs vary by brand and use case
View on Amazon
Comparison Set
CCA-Treated Wood safety-tested options

Browse vetted product candidates and compare materials, certifications, and user outcomes.

Helps identify lower-risk products quickly
Requires label and specs review before purchase
View on Amazon

Sources

  1. US EPA: Assessing and managing chemical risk in consumer environments — https://www.epa.gov/
  2. ATSDR Toxicological Profiles — https://www.atsdr.cdc.gov/toxprofiledocs/index.html
  3. WHO: Chemical safety and exposure pathways — https://www.who.int/health-topics/chemical-safety