Circular No. 04/2015/TT-BXD guiding a number of articles of the Government's Decree No. 80/2014/ND-CP of 6 August 2014, on water drainage and wastewater treatment.

This Circular implements a number of articles of the Government's Decree No. 80/2014/ND-CP of 6 August 2014, on water drainage and wastewater treatment. It deals with the following issues: Management of decentralized wastewater treatment; Decentralized wastewater treatment solutions: a) On-site decentralized wastewater treatment is applicable to isolated discharging households with a total volume of below 50 m3 of wastewater per day and night and wastewater treatment equipment/station located within the premises of the discharging household; b) Cluster-based decentralized wastewater treatment is applicable to discharging households located near one another with a total volume of between 50 m3 and 200 m3 of wastewater per day and night. Depending on specific conditions, a wastewater treatment station may be installed within the premises of a discharging entity or at a separate location convenient for collecting wastewater from discharging entities; c) Zone-based decentralized wastewater treatment is applicable to a certain administrative territory with a total volume of between 200 m3 and 1,000 m3 of wastewater per day and night and the wastewater treatment equipment/station located under an approved construction master plan or water drainage master plan; Criteria for selection of decentralized wastewater treatment technology, etc.