The decision to enact the law was taken at a meeting here chaired by the Prime Minister and attended by Bihar Chief Minister Nitish Kumar, Uttarakhand Chief Minister Harish Rawat and Jharkhand Chief Minister Raghubar Das.
However, Uttar Pradesh Chief Minister Akhilesh Yadav and West Bengal Chief Minister Mamata Banerjee, two other states through which Ganga flows, did not attend the meeting of the National Ganga River Basin Authority.
"Ganga can be made pollution free with the joint efforts of state governments and the Centre. But, the challenge is maintaining its cleanliness thereafter. The upcoming act will ensure the cleanliness of Ganga," she added.
"We have sought proposals from concerned state governments for the purpose, as water is the state subject," she said, while states have also urged the Prime Minister to send the draft proposal of the proposed law.
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Asked about the absence of Yadav and Banerjee, Bharati said the Prime Minister's Office had said that the concerned Chief Ministers can attend or send their notes for the meeting as no other representative on their behalf can participate.
At the meeting, Modi described the task of cleaning Ganga as "challenging" and pitched for an "uncompromising mission-mode approach" to stop further pollution of the river which would require the participation of people as well, a statement from the PMO said.
The task of cleaning the Ganga had the potential to generate immense economical activity and bring about a positive attitudinal change in the entire country, he said.
He said it is "our responsibility for future generations" to save the river which is associated with "faith" and "devotion" among millions of Indians, a PMO statement said.
Bharati said Kumar raised some issues that the Centre was already aware of but he did not have any specific reservation.