Why is it unsafe to drink tap water after a hurricane?

What is the elevation for the River Thames in meters? What are the two largest groups of organisms in the world? Could contact metamorphism change a shale into a phyllite? There are two major groups of land plants? What is it called when human turn into plants? If you got married in Kenya how to you get divorced in the UK and is my marriage legal in the UK? What is the volume in kiloliters of a beaker that holds 4.2 liters of water? When a smell spreads the particles move away from where they are relatively of them? What is the boiling point of thallium? How is oxygen and glucose transported? What has cell walls that contain chitin but do not contain chloroplasts or produce their own food? How do you pasteurize honey? What year were cinder blocks used to build foundations? How many micro-liters equals 1 ml? The secretion of tears milk sweat and oil are functions of what tissue? Where do purple roses grow? What process is more efficient at producing ATP? What structure of the cell holds chlorophyll? What is cable size in mm2 required for 450 amps? Do lava flows cause more deaths than other volcanic hazards?