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This satellite image provided by NOAA shows the algae bloom on Lake Erie in 2011 which according to NOAA was the worst in decades. The algae growth is fed by phosphorus mainly from farm fertilizer runoff and sewage treatment plants, leaving behind toxins that have contributed to oxygen-deprived dead zones where fish can't survive. The toxins can kill animals and sicken humans. Ohio's fourth-largest city, Toledo, told residents late Saturday Aug. 2, 2014 not to drink from its water supply that was fouled by toxins possibly from algae on Lake Erie. (AP Photo/NOAA)