Human groundwater contamination can be related to
waste disposal (
private sewage
disposal systems, land
disposal of solid
waste, municipal wastewater, wastewater impoundments, land spreading of sludge, brine
disposal from the petroleum industry, mine
wastes, deep - well
disposal of liquid
wastes, animal feedlot
wastes, radioactive
wastes) or not directly related to
waste disposal (accidents, certain agricultural activities, mining, highway deicing, acid rain, improper well construction and maintenance, road salt).