In compliance of Hon’ble Monitoring Committee constituted by Hon’ble NGT in the matter of O.A. 06 of 2012 in the matter of Manoj Mishra Vs Union of India & Ors held on 28.08.2018, CPCB conducted water quality assessment of Upstream and Downstream of 10 Ghats on river Yamuna for pre Ganesh Chaturthi Idol immersion activity on 11.09.2018 and post immersion activity on 24.09.2018 and 25.09.2018. Water quality with respect to physicochemical parameters and heavy metals was assessed. Assessment revealed that before Immersion activity, water quality was not conforming to the Primary Water Quality Criteria for Bathing. Post immersion activity, water quality remained as non-conforming to the criteria and further deteriorated significantly.