21	Tamil Nadu	It is mandatory for all the existing and new buildings to provide rainwater harvesting facilities under Municipal laws. It has also been made mandatory to include roof top rainwater harvesting structures in the plan of the building itself for accordance of approval by the relevant Competent Authority.
22	Tripura	As per Tripura Building Rules, 2004, water harvesting is mandatory in all new buildings having plinth area more than 300 sq m for all types of uses and in group housing of any size.
23	Uttar Pradesh	• Rainwater Harvesting made mandatory for all new housing schemes/ plots/ buildings/ Group housing schemes with separate network of pipes for combined Rainwater Harvesting/ Recharging system. • In Government Buildings (both new as well as old), installation of rainwater harvesting structures has been made mandatory. • For housing schemes of 20 acres and above, it is mandatory to develop ponds/ water bodies in 5% of the total proposed area.
24	Uttarakhand	The Government (Awas Evam Shahari Vikas) made rules for compulsory installation of rainwater harvesting system and directed to adopt rules in building byelaws vide order dated 15.11.2003. Accordingly, all the Development Authorities have made partial amendments in the prevalent House Building and Development byelaws/ Regulation.
25	West Bengal	Government has notified 'The West Bengal Municipal (Building) Rules, 2007' and vide its rule No. 168 (13), Part - XII has made rainwater harvesting mandatory for all buildings.
26	Andaman and Nicobar Islands	In UT of Andaman & Nicobar Islands, rooftop rainwater harvesting has been made mandatory in Port Blair Town.
27	Chandigarh	UT Administration has made installation of rainwater harvesting system mandatory for all buildings (existing and new) located on plot of one kanal and above to recharge ground water.
28	Dadar, Nagar & Haveli	Roof Top Rain Water Harvesting made mandatory as per Development and Control Rules (Amendments Rules 2009) in all types of buildings, which are constructed in an area of 1000 sqm and above.
29	Daman &Diu	Daman Municipal Building Model Byelaws and Zoning Regulation, 2002 exists which have provision for construction of sump-well for recharge of ground water. The UT Administration has issued instructions to the local PWD for construction of roof top rainwater harvesting structures. Administration has also advised the local bodies such as Municipality & District Panchayats to make provision for construction of roof top rainwater harvesting structures.
30	Delhi	• Roof top rain water harvesting made mandatory for building having area of 100 sq mand above by amending building byelaws. • Registrar Cooperative Societies has advised all Group Housing Societies to adopt rainwater harvesting in their premises. • Requested all Government departments to adopt rainwater harvesting and waste water recycling system. • NDMC, MCD, DDA, PWD sanctioning plan by including rainwater harvesting in their buildings.
31	Puducherry	Made provision of rainwater harvesting mandatory in residential, offices, public buildings, commercial buildings, educational and health institutions and industrial buildings vide Govt. Order Dated 19.3.2010.