On Tuesday night, Liverpool Plains Shire Council said the drinking water in the Wallabadah system was unsafe to consume.

The water storage was hit by the weekend's flash flooding and storms and it impacted the village's pump station, causing problems with water treatment.

Council said water used for drinking or food preparation should be brought to a rolling boil to make it safe.

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In the safety advice, council said water should then be allowed to cool and stored in a clean container with a lid and refrigerated.

Bottled water or cool boiled water should be used for drinking; washing uncooked food, for example salad, vegetables and fruit; making ice; cleaning teeth; gargling; and pet's drinking water.

Council said dishes should be washed in hot soapy water or in a dishwasher; and children should take bottled water or cool boiled water to school.

Council said crews have been working to return the system to safe operation and were working with NSW Health to ensure the system recovers as quickly as possible.

The boil alert will remain in place until water tests are clear and residents are urged to follow the advice until further notice.

The torrential rain and flash flooding that hit on the weekend caused closed to $2 million in damage with council looking for a natural disaster declaration.

The flooding also washed away the pipeline connecting the Quipolly Dam to the Werris Creek treatment plant. It triggered Level 5 water restrictions immediately for locals while crews work to repair the pipeline to restore water supply availability.

Residents looking for more information are also urged to visit the NSW Health website for further details.

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