ASSESSMENT OF WATER QUALITY OF RIVER YAMUNA USING POLLUTION INDICES

The river Yamuna is considered a crucial in the Indo-Gangetic plain. Having 0.4 Percent of catchment area National Capital Territory (NCT) Delhi, it feeds about 70 per cent population Delhi and hence, major source dependency for NCT Delhi. water quality monitoring River done by Pollution Control Committee (DPCC), on monthly basis.The objective study to investigate stretch, period 2003-2021. data has been derived from experimental analysis at DPCC across seven stations analysed present study. It revealed that pollutant load urban local bodies drains have stronger impact parameters after Wazirabad resulting deteriorated high-Water Quality Indices (WQI). Water Index (WQI) year 2021 indicates pollution increases during monsoon post-monsoonperiods while pre-monsoon remains relatively low.The average pH ranges 6 8 throughout year. comparative reveals dissolved oxygen (DO) most sites (except Palla) nil and, values BiochemicalOxygen Demand(BOD) Chemical Oxygen Demand (COD) increasing tremendously, which due unregulated discharge or dumping sewage (ULB) river.