More than 300,000 hectares of burnt land surround Sydney’s main reservoir, Warragamba Dam.
It’s that debris that has authorities worried.
Water NSW system operations manager Adrian Langdon says they've installed nets to catch fallen trees and protect drinking water.
But hydrologists, such as Professor Ashish Sharma say water should still be drinkable.
Water is much needed at the dam - levels are down to 43 per cent, which is the lowest level since 2004, during the millennium drought.
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