Foreword
After Quality Monitoring is an important pre-requisite for water quality management. It helps us to know the nature and extent 0£ pollution to which a particular water body is subjected to, and remedial measures required to restore it.,CPCB initiated the water quality n,onitoring programme in 1976-77 with 18 stations on Yamuna river. The programme was gradually extended based on the available resources and existing water quality problems. Although, the monitoring network adequately covered the sur£ace water resources of the country, the groundwater quality was not emphasised in the existing network. Speci£ic pollutants like heavy metals, pesticides, industrial pollutants which were not so important in the past, are becoming more and more important in certain pockets of the country. Monitoring of such pollutants is hence a necessity .It is also important to optimise the £requency of sampling to minimise the expenditure and maximise the information on water quality.