Tamil Nadu Pollution Control Board is monitoring the inland water quality under two major programmes namely Global Environmental Monitoring System (GEMS) from 1984 and Monitoring of Indian National Aquatic Resources (MINARS) from 1988 at 32 stations along the four major rivers i.e. Cauvery, Tamiraparani, Vaigai and Palar and three lakes i.e. Ooty, Kodaikanal and Yercaurd in Tamil Nadu.

Subsequently, CPCB has sanctioned 23 additional Water Quality  Monitoring stations under the 11thplan period during November 2010 and the Monitoring was started from December 2010. At present  55 (32 old stations+23 new stations) stations are being monitored by Tamil Nadu Pollution Control Board.The programmes are funded by the Central Pollution Control Board, New Delhi.

Under MINARS programme, the rivers Tamiraparani, Palar and Vaigai and the lakes Udhgamandalam, Kodaikanal , Yercaud ,Veeranam ,Porur ,Poondi, Pulicat  and Redhills  are being monitored.  Under GEMS and MINARS programmes the river Cauvery is being monitored.

The River
Cauvery and its Tributaries

The Cauvery river is a major river in the State which drains more than one third of the State.This river has been identified as a major river for studying the impact of pollution caused by various activities of the domestic and industrial sectors.The quality of cauvery river water is being monitored at thirty three (33) places along the river under GEMS (4 stations) and MINARS (29 stations).  These places have been selected on the basis of the location of outlets for the discharge of industrial effluents,municipal and domestic wastes.

 The physico-chemical and biological parameters are analysed for all the monitoring stations.  Sampling is carried out  based on the   frequency prescribed by Central Pollution Control Board, New Delhi and analysis is done at the Advanced Environmental Laboratory, Salem.

 The River Tamiraparani

 The water quality of the Thamiraparani river is being monitored on a frequency prescribed by Central Pollution Control Board, New Delhi  at 12  places.The physico-chemical parameters and biological parameters are analysed in the District Environmental Laboratory at Tirunelveli.       

The River Palar

 One station viz., Vaniyambadi Municipal Head  Works in the Palar river  is being monitored every month.  The analysis of water samples is done in the Advanced Environmental Laboratory at Chennai, for physico-chemical and biological parameters.  

The River Vaigai

 The water quality of the Vaigai river is being monitored  by collecting the samples  once in six months from the collection well of Thirubuvanam Head works and analysed in the Advanced Environmental Laboratory at Madurai for physico-chemical and bacteriological  parameters.


 Under MINARS programme, 8 important lakes of Tamil Nadu at Udhagamandalam, Kodaikanal, Yercaud, Veeranam, Porur ,Poondi ,Pulicat and Redhills  have been identified and monitored by collecting samples on monthly basis. 


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