Correct option is (b) Tamil Nadu. Tamil Nadu introduced mandatory rooftop rainwater harvesting in 2001 to address severe water scarcity. It requires new buildings to install systems to collect and store rainwater, helping recharge groundwater and reduce dependency on municipal water supply.
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Tamil Nadu became the first Indian state to make rooftop rainwater harvesting compulsory in 2001. The initiative was implemented to combat severe water shortages, particularly in Chennai. All new buildings are required to collect and store rainwater, which replenishes groundwater, reduces urban flooding and ensures sustainable water management for households and communities. Option: (b) Tamil Nadu