Water quality in Hyderabad's Hussain Sagar deteriorated during the Ganesh idol immersion period, with key parameters such as turbidity, suspended solids, COD, BOD and coliform levels registering a rise across monitoring locations. Hyderabad: Water quality in Hussain Sagar was affected during Ganesh idol immersion, with turbidity, suspended solids and chemical pollutants remaining elevated even after the immersion.