Section 24A(i) in The Chennai City Corporation Building Rules, 1972
(i)Ordinary buildings (Ground + 2 floor, residential buildings, not exceeding four dwelling units or Commercial/ Industrial Institutional building not exceeding 300 square meters). - The waste water from the bath and wash basin shall be used for ground water recharge by organic filteration (by providing suitable filter media) depending upon the soil suitability or for recycling for toilet flushing as indicated for other buildings specified in item (ii) below.
