Containers such as these usually contain industrial waste.
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Septic tanks, city dumps, and chemical industry waste waters may contaminate groundwater with phosphates and other foaming agents from detergents. Extensive salting of icy roads may lead to sodium chloride (NaCl) contamination as well as cadimium chloride, chromium and sodium contaminants. Another very common comtaminant to ground water is nitrate fertilizer used in farming because nitrates are healthy for plants, but toxic to humans.
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