Fence posts can be treated with substances listed on the Permitted Substances List (PSL), Table 4.3.
If there are existing fence posts in use within an operation that are treated with a prohibited substance such as CCA (for example), or if a new operation is purchased that already has fence posts in place, those posts can remain in use and/or be recycled within the operation.
If a new applicant installs treated fence posts while in their transition period, this would result in a 36-month transition of the specific production unit where they were installed.
If an existing certified organic operation installs treated posts, decertification could result if they cannot prove due diligence for the commercial availability of an alternate choice.