Dubbo Regional Council director infrastructure Julian Geddes said water treated at the Geurie plant was now consistently meeting Australian Drinking Water Guidelines.

"We have lifted the precautionary Boiled Water Alert effective immediately. Residents are no longer required to boil water in Geurie," he said.

"We thank the residents of Geurie for their co-operation and patience over the past four weeks. It has helped us during a challenging and unusual time in returning the town's water to acceptable standards."

Geurie had been on a Boil Water Alert since 30 January after rain and dust storms produced unusually high levels of turbidity in the Macquarie River and flows into the treatment plant.

Meanwhile, the precautionary Boil Water Alert for Wellington, which was issued February 5, remains in place.

"We have seen improvements in the quality of water in Wellington but at this moment, not to the same levels as Geurie," Mr Geddes said.

"We are investigating a range of extra further short-term treatment options to improve the town's water supply quality."