All kinds of wastes — garlands, plastic bottles, leftover food and used clothes — could be seen dumped on the river bank. A closer look near the rear portion of Government Rajaji Hospital revealed the lurking danger. Water (five lakh liters) was allegedly pumped from the State-run hospital into the river. According to a reliable source in the Pollution Control Board, the GRH does not treat the medical waste and pumps them into the Vaigai.