1. Natural water quality varies significantly.
Image: B. Molnia
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2. Water quality can be degraded by community and industrial waste discharge.
Images: Bruce Molnia, D. Mueller
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3. Water quality can be degraded by runoff containing fertilizer and pesticide chemicals from fields.
Images: USDA, NRCS
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4. Water quality can be degraded by erosion and sediment dispersal in streams.
Images: NRCS, D. Mueller
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5. Water quality can be degraded by bacteria from animal and people waste.
Images: NRCS, USGS
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6. Water can be degraded by inappropriate solid waste disposal as at this old metal mine.
Image: Travis Hudson
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7. Water quality can be degraded by accidents such as oil spills.
Images of Exxon Valdez Oil Spill: NPS, NOAA
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8. Water quality needs to be protected.
Images: USDA, NRCS
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