Concerns about water quality in Sydney’s main reservoir following last summer’s bushfires have prompted the government to continue to operate the city’s 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, Sydney’s dams were 97.5 per cent full having doubled since February rains effectively ended the region’s drought. Nepean reservoir continues to spill, while most others are more than 94 per cent full.

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