The lake is contaminated with various toxic substances. His body was severely contaminated by radioactive water. Because of agricultural practices, it is often contaminated by agricultural pesticides. These ducks may be contaminated by pollutants such as PCBs. The water was contaminated and filled with debris. Similarly milk and products are easily contaminated by bacteria and spoiled. Infections occur through contact with these bodily fluids or with contaminated surfaces. Cooling waters are inevitably contaminated with products especially ammonia and cyanide. The carcasses formerly eaten by vultures rot in village fields leading to contaminated drinking water. Well water can be contaminated in some areas. The sediment in the water can also become contaminated. On rare occasions, blood products are contaminated with bacteria. Spread may also occur from contact with items recently contaminated with bodily fluids. The area was sometimes contaminated by chemical weapons. Whale meat can also be contaminated with polychlorinated biphenyls.