Foreword
The Yamuna is the largest tributary of the Ganga; yet in various stretches, she flows like a small rivulet. The cause of concern is not only the scarcity of water in the river, but also its poor quality. The cities and towns on the river bank are extracting water for various uses and disposing their waste water into it. The quality of the river is deteriorated due to unabated discharge of domestic and industrial waste water. In Delhi, Mathura and Agra, the river becomes a receptacle of waste water only with extremely poor water quality.

The Government of India launched the Yamuna Action Plan to restore the water quality of the Yamuna. Under this plan, waste water collection and its treatment will be strengthened at major centres of pollution sources to the river. The river water quality monitoring is undertaken to ensure the effectiveness of various pollution abatement measures. The Central Pollution Control Board (CPCB) has been monitoring the water quality of the