Pollution abatement in the rivers Cauvery, Vaigai and Tamiraparani along seven towns viz., Tiruchy-Srirangam, Thanjavur, Kumbakonam, Karur-Inam karur, Mayiladuthurai, Madurai and Tirunelveli is under implementation from 2001. The project envisages provision of underground sewerage systems, Sewage Treatment Plants, low cost sanitation and solid waste management. The core works are being executed by Chennai Metropolitan Water Supply and Sewerage Board in Madurai and Kumbakonam. The core (Under Ground Sewerage System works) in respect of Karur, Mayiladuthurai, Thanjavur, Tiruchy and Tirunelveli have been completed through Tamil Nadu Water Supply and Drainage Board. The non core works like Low Cost Sanitation and Solid Waste Management are being implemented by Local body.