Water, power affected after WA bushfire

A bushfire warning in Western Australia's South West has finally been downgraded to an advice level, but many residents are still without power and water.

The blaze in Northcliffe, sparked by lightning 12 days ago, has destroyed two houses and several sheds.

Western Power says some properties in Northcliffe remain without power and the Water Corporation warns that drinking water supply and pressure in the area might be affected.

Residents returning to properties with water tanks have been told to check with the information point to determine whether the water is safe.

The Department of Fire and Emergency Services says the fire is contained but not fully controlled.

Favourable weather conditions have stopped the spread of the blaze - which has burnt through 95,000 hectares - but there are still hot spots around the fire, DFES says.

Windy Harbour Road has re-opened from Northcliffe to the settlement, but several other roads remain closed.

South Western Highway from Middleton Road to Mandalay Beach Road could be closed for several weeks, with assessment of the highway to begin on Wednesday.

DFES warns people not to risk their own lives by trying to get around road blocks.

"These closures are in place in the interest of public safety and the safety of firefighters," DFES said.

All patients and residents who were moved from the Pemberton Hospital to Warren Hospital and Moonya Nursing Home in Manjimup have now been returned.

The Northcliffe Nursing Post was also opened on Tuesday.

Smoke is still visible across the Perth metropolitan area and the South West region from several existing fires.

Meanwhile, the all clear has been issued for Pemberton, Walpole and surrounding areas.