Regulations in Maharashtra :
On 14th Feb. 2002, Water Supply & Sanitation Department of Government of Maharashtra has issued a G.R approving Rain Water Harvesting as a means of improving water supplies. The G.R. details various techniques of Rain Water Harvesting, their costing & availability of funds. In furtherance Municipal Corporation of Greater Mumbai has issued a Circular insisting provisions for of Rain Water Harvesting while developing plots having area more than 1000 Sq.Mts, as I.O.D. conditions from 1st Oct. 2002. The design of Rain Water Harvesting system shall be prepared by approved consultant in the field & shall be to the satisfaction of the Corporation. Further all Centrally Air conditioned building shall have their own waste water treatment plant & treated waste shall be used for cooling purposes.
For more details please see: http://mahawssd.gov.in/home.html