http://news.bbc.co.uk/2/hi/south_asia/4286267.stm
Tsunami threat to water supplies
Fresh water supplies in countries hit by the Asian tsunami are under serious threat, according to a UN report.
Drinking water sources have been contaminated by salt water and sewage, and every well in Sri Lanka may have been affected, the study says.
Hazardous materials such as toxic waste and asbestos from buildings may also be in the water in some areas, it adds.