The Water Resources Minister's stern view comes in the wake of recent reports suggesting that work on the Centre's ambitious programme has slowed down.
The National Mission for Clean Ganga (NMCG) is entrusted with the responsibility of executing the project.
"The minister directed NMCG officials to ensure timely execution of the projects at various places.
"She said a lacklustre attitude towards implementation of the project will no longer be tolerated," ministry spokesperson Samir Sinha said.
The government aims to clean up the 2,525-km river by next year.
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