Residents in a subdivision of Naperville, Illinois, believe that their recent health complaints, and mold-like staining on their backyard patios and fencing, are being caused by a "toxic mist" spraying off of a fountain in a pond adjacent to their homes. These resident also claim that they have tested the pond's water themselves, and found excessively high levels of E Coli bacteria. (The subdivision responsible for the pond says they, too, have tested the pond water, but that no excessive E Coli was detected.) 1