Sydneysiders are using higher than average amounts of water and face the prospect of four more years of restrictions and a hike in bills from next July if the drought does not break.

Sydney Water has submitted a revised submission to the Independent Pricing Regulatory Tribunal (IPART) for a proposal that would see annual water bills rise by $30 a year with dam levels on Tuesday sinking to 46.3 per cent.

The state government is also expected to soon announce the expansion of the desalination plant.

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