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Interpreting L-THIA's Results: Non-Point Source Pollution
NPS pollution comes from many diffuse sources.
It is caused by rainfall or snowmelt moving over
and through the ground. Runoff after rain events
pick up and carry away natural and human-made
pollutants, finally depositing them into lakes,
rivers, wetlands, coastal waters, and even our
underground sources of drinking water. NPS pollution
remains the largest source of pollution of water
bodies in the United States. (EPA, 1997)
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