The environmental damages and hazards on public health were the longest-lasting effects of hurricane Katrina.
The industrial wastes, oil spills, domestic sewage, toxic chemicals and other hazardous pollutants had swept to the directly hit areas as well as neighboring regions.
The polluted floodwater that overflowed the residential areas caused long-term health effects on humans, animals and other inhabitants of the area.
It also resulted in pollution of groundwater reserves, which is a cheif water source for drinking purposes.
Studies disclosed that the water samples of floodwater contain high amounts of E. coli bacteria, medical waste, sewage, oil, toxic lead, hexavalent chromium and arsenic along with particulate matter.
As a strategy to prevent severe health difficulties, household water pipes were repaired and replaced. Though it was claimed that oil spills had been cleaned totally, the environmentalists are of the opinion that the effects of hurricane Katrina will continue to affect the ecology and biodiversity for many years.