![U.S. Epa: Polluted Runoff U.S. Epa: Polluted Runoff](/sites/default/files/styles/wide/public/articles/2023/Screen-Shot-2020-07-16-at-2.50.46-PM-landscape.jpg?itok=EOs7d525)
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Nonpoint source (NPS) pollution is caused when rainfall or snowmelt, moving over and through the ground, picks up and carries natural and human-made pollutants, depositing them into lakes, rivers, wetlands, coastal waters and ground waters. Learn the basics of NPS pollution.