Delhi Jal Board officials said treatment of water has come down sharply at the Haiderpur Water Treatment Plant following cut in supply by Haryana.
The officials said the issue has been taken up with the "highest authority" of the neighbouring state.
They said due to shortage of water, supply of water was affetced in many areas of South Delhi today as well.
"Due to raw water supply being restricted by Haryana, production at Haiderpur Water Treatment Plant has been affected leading to short supply of water in South, South-West, West and North-West parts of Delhi," a DJB official said.
Treated water produced at the Haiderpur plant is distributed in most areas of South Delhi.
The officials said water level at Wazirabad pond has also dropped sharply which may affect production of water at Wazirabad water treatment plant also.
