Sewage overflow has been reported at Black Beach and Kendalls Beach in Kiama in the wake of the heavy rain, prompting a warning for swimmers.
Kiama Municipal Council has advised residents to avoid swimming until at least one day after heavy rain at beaches, and for up to three days in harbour or estuarine swimming areas.
People should also avoid floodwaters.
Read more: Yacht sinks at Belmore Basin mooring
Affected areas will be cordoned off; the council will advise when they are safe.
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