DJB set to undertake a study to revamp the sewage network by 2041 October 9, 2024 | Key Segments, Municipal Wastewater, Municipal Water Supply, News & Developments, Wastewater, Water Supply Delhi Jal Board (DJB) will undertake a study to renovate Delhi’s 10,720 km sewage network and the 38 STPs by 2041. This content is restricted.