Sydney water quality issues keep desal plant running – Australia Concerns about water quality in Sydneyâs main reservoir following last summerâs bushfires have prompted the government to continue to operate the cityâs desalination plant even as dams near capacity. Warragamba Dam on Friday reached 99 per cent capacity after recent rains lifted water levels by one-eighth in a week, WaterNSW data shows. Across the network, Sydneyâs dams were 97.5 per cent full having doubled since February rains effectively ended the regionâs drought. Nepean reservoir continues to spill, while most others are more than 94 per cent full. Sydney water quality issues keep desal plant running – AustraliaHIWI042020-08-14T10:16:13+02:00