The green panel, which had directed Delhi Jal Board (DJB) to submit a detailed status report on RWHS, said that complete information with regard to RWAs was necessary to find out how many of them have installed them.
"While expressing concern for the installation of RWHS in Residential Welfare Association premises, Central Ground Water Authority and DJB were directed to place status report in that regard before us.
"We direct the respondent no 5 government of NCT of Delhi to furnish a list of Residential Welfare Associations in Delhi registered with Registrar under the Society Registration Act before us," a bench headed by Justice U D Salvi said.
The matter is posted for next hearing on September 22.
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The NGT had earlier directed DJB to submit a detailed status report on the installation of rain water harvesting systems in the state.
During the hearing, an assistant engineer of the Delhi Jal Board had told the green panel it has started three rain centres at Dwarka, R K Puram and Lajpat Nagar.
Taking several hospitals, malls and hotels to task for not complying with its orders on rainwater harvesting, NGT had last year imposed fines and issued warrants to many of them for not installing these systems.
The green panel has widened the ambit of the petition and incorporated various other establishments like hospitals, hotels and malls.
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