Summary

Treated wood can help farm structures last longer, but some preservatives are not allowed in organic production. This guide explains common pressure-treated products, including arsenic-based treatments like CCA and newer copper-based options such as ACQ and CA, and summarizes National Organic Program rules for what can and cannot touch organic soil, crops, livestock, or compost. It covers grandfathered structures, buffer and barrier options, and why certifiers may interpret rules differently. Also lists alternatives like naturally durable woods, untreated wood, steel, concrete, and plastics.