This is water that has a significant level of contamination. Gray water can potentially cause sickness, skin reactions, and discomfort if exposed to humans. Gray water may contain bio-contaminants (fungus, bacteria, viruses, mold, algae), chemicals, or other contaminants. This includes overflows from toilets containing urine (no feces), sump pump failures, seepage cause by hydrostatic pressure, broken aquariums, punctured water beds, discharge from washing machines or dishwashers, and overflows from washing machines.