What are requirements for connection of water drainage system of urban areas and residential areas in Vietnam?

Pursuant to Clause 2, Article 6 of the Circular 15/2021/TT-BXD (takes effect from 10/02/2022) stipulating requirements for connection of water drainage system of urban areas and residential areas in Vietnam as follows:

- In urban areas and residential areas that have separate water drainage systems and concentrated urban wastewater treatment plants, domestic wastewater of discharging households shall be directly connected to connectors. When upgrading or renovating common water drainage systems into separate water drainage systems, owners of water drainage structures must rely on current conditions and water drainage requirements of the areas where the upgrade and renovation take place to decide on retention of septic tanks;

- Wastewater drainage gates of discharging households must be connected with connectors or other wastewater drainage structures if connectors are absent. Combined sewer overflows of discharging households must be connected to connectors for rainwater, canals, channels, or local combined sewer overflows;

- Untreated wastewater must be connected to collection sewers of water drainage system and prevented from permeating the ground or seeping into other water sources;

- Wastewater of manufacturing, business, service facilities in urban areas and residential areas must be preliminarily collected and treated in a manner satisfactory to regulations of urban areas or local governments prior to being connected to wastewater collection and drainage structure;

- Treated wastewater of manufacturing, business, service facilities in urban areas and residential areas must meet environmental technical regulations or environmental protection requirements depending on types of wastewater prior to being connected to wastewater connection and drainage structure.

Best regards!