NARRABRI residents will have to boil their drinking water for the foreseeable future.
It comes after the council met with NSW Health to discuss test results from the town's contaminated water supply.
Floodwater breached the Killarney Street bore on the weekend and residents have been advised to boil their drinking water ever since.
Tap water can be used for showering and general household duties.
Any water used for cooking or drinking should be boiled before consumption.
In a written statement, Narrabri Shire Council said more "line-flushing" had to be undertaken as well as more testing, as a precaution.
Residents are encouraged to check their water supply regularly and any household still experiencing dirty water are urged to contact the council on 02 6799 6866 during business hours 8.30am to 5.00pm or the emergency after hours number on 0429 911 111.
Narrabri was drenched after heavy downpours this weekend.
More than 70mm fell causing flooding in parts of the community and sparking several emergency rescue operations.
A number of roads remain closed in the shire and the council has shut all sporting ovals in the area as well.