ZDHC wastewater and sludge guidelines is not applicable for Central Effluent Treatment Plant (CETPs). It is only applicable for facility discharge. Facilities that discharge wastewater to Central Effluent Treatment Plant (CETPs) with or without pretreatment should test their untreated wastewater, effluent, and sludge as applicable only for relevant parameters as per ZDHC Wastewater and Sludge Guidelines based on their discharge volumes.