For a facility, there could be more than one method of sludge disposal. In that case, the lab needs to conduct the testing only on the method used to dispose of the majority of the sludge rather than conduct testing on all methods.

ZDHC does not intend the lab sampler to assess or confirm the major disposal pathway adopted by the supplier. Instead, the facility must declare its major sludge disposal pathway in the Supplier Profile in its ZDHC Gateway account. The ZDHC Approved lab sampler only needs to confirm (before travelling to the facility for sample collection) that the facility has made this declaration, and then note what the pathway is (from A to G) for purposes of interpretation of the sample results by the lab.