1.3 Treated lumber

Cross references

US Reference: § 205.206 Crop pest, weed, and disease management practice standard.
NZFSA Technical Rules for Organic Production:
Section 6, point 6.6
Section 5, point 5.9
Section 7, point  7.8.1

The producer must not use lumber treated with arsenate or other prohibited materials for new installations or replacement purposes in contact with soil or livestock.

This means:
Treated lumber is prohibited from direct contact with organically produced and handled crops and livestock. This prohibition does not include uses such as lumber for fence posts or building materials that are isolated from production. The prohibition applies to lumber used in crop production, such as frames of a planting bed, and for raising livestock such as the boards used to build a farrowing house.
Treated lumber is prohibited for use in:
wooden structures used to support crops
wooden frames for planting beds
livestock housing
enclosures used in intensive livestock production

The prohibition does not apply to:
fencing used to manage stock in extensive livestock production systems.

(Ref. Email correspondence from Keith Jones, USDA- “Organic Enquiries” (08/05/03))