Yes, wastewater effluent is used in the making of compost.

Wastewater effluent is pumped under the Thompson River to Cinnamon Ridge to be used for irrigation on farms in the area and to provide moisture for our compost. Water not pumped under the river for reuse is released directly into the river. Wastewater effluent is treated to the same level as its release point. So in this case, the wastewater is treated to the same water quality level as the Thompson River.