Water supply would be affected due to annual flushing of underground reservoirs/booster pumping stations on Monday at Daryapur, Jhul Jhuli, Sarangpur, Rawta, Daurala, Galibpur, Surera, Jaffarpur, Mudhela Kalan, Mudhela Khurd, Easopur, Malikpur, Dhansa, Samaspur, Ujwa, Vasant Lok and DDA staff quarters, Ber Sarai, Delhi Jal Board said.