Phosphates

On Monday, August 4, half a million people in the Toledo, Ohio metro region could once again drink from their water taps after a weekend without safe drinking water due to a toxin resulting from an algal bloom in the city's water supply, Lake Erie.
Aug 7, 2014   The Wall Street Journal
Certain fertilizers will be banned from use during summer months and rainy times of the year in Pinellas County, Florida after a recent ruling by the County Commission.
Jan 21, 2010   St. Petersburg Times