M.C. Mehta vs Union Of India & Ors.

The Supreme Court directed the Delhi Jal Board to expedite the establishment of Sewage Treatment Plants (STPs) to address the untreated sewage flowing into the Yamuna River, citing the need to increase treatment capacity from 505 mgd to 764 mgd by 2005. The Court expressed concern over the lethargy in execution and the lack of urgency from authorities, mandating that final decisions on pending tenders be made within one week. The judgment emphasizes the necessity of ancillary works, including laying trunk sewers, to ensure the effective functioning of STPs.