People in cyclone-affected areas of Samoa are being urged to boil their water before using it.
Authorities are still working to restore water supplies in the Pacific island nation, after pipelines and pumping stations were damaged in last month's cyclone.
Cyclone Evan has left parts of the country without proper supply, especially on the main island of Upolu.
Around 300 people remain in evacuation centres.
International aid agency OXFAM and the Samoan Government are providing safe water to people still living in shelters or without clean water.
Oxfam's Pacific humanitarian manager Carlos Calderon has told Radio Australia's that many Samoans are relying on streams contaminated by bacteria for their water supply.
"That's why Samoa Red Cross (and) Oxfam in partnership with ADRA (the Adventist Development and Relief Agency) are also chlorinating water," he said.
"But we need a more stronger message from the government to make the people be aware of that, and to boil the water no matter what the source is."
Five people died and at least 12 people are still missing in Samoa in the wake of the devastating cyclone.
© ABC 2013
20:13 EST Several homes were damaged when a storm tore through Keysborough, in Melbourne's south-east.