| Agricultural | Residential | Industrial | Natural | |
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| Contaminants |  |
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| Antimony |  |
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| Arsenic |  |
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| Asbestos | |
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| Barium | |
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| Cadmium | |
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| Chromium | |
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| Copper | |
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| Fluoride | |
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| Lead | |
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| Mercury | |
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| Nickel | |
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| Nitrate | |
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| Nitrite | |
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Selenium | |
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| Thallium | |
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