The precautionary Boil Water Alert for Wellington and Geurie will remain in place over the weekend, Dubbo Regional Council has said.
The alert for Wellington was issued on Wednesday afternoon.
A precautionary Boil Water Alert for Geurie, also due to high water high turbidity, was issued last Thursday.
Residents in the region are asked to limit water use over the weekend while Council continues work to return supplies to Australian Drinking Water Guidelines that meet NSW Health standards.
On Thursday, Council's infrastructure director Julian Geddes, together with Western NSW local health district health protection manager Priscilla Stanley addressed the media to speak about the Boil Water Alert for both towns.
Mr Geddes said it was due to the river water becoming quite turbid because of recent rain.
The sediment in the river was making the water difficult to treat, he said.
"The boiled water alerts will be ongoing until the water quality increases or the council is able to meet the drinking water guidelines," Mr Geddes said.
"Residents in Geurie and Wellington are thanked for their ongoing co-operation since the alerts were issued following recent rain and dust storms that increased turbidity in the water supply systems," Council's infrastructure director Julian Geddes said.
"We continue to monitor the treatment and quality of water at plants in Geurie, Wellington and Dubbo, working in close co-operation with NSW Health to ensure the health of our residents comes first."
Health information on the Boil Water Alert is available on the Dubbo Regional Council website.
Council will issue a further update on Monday.