and what is a contaminant. High concentrations of naturally occurring substances can have negative impacts on aquatic flora and fauna. Nonpoint source pollution refers to diffuse contamination that does not originate from a single discrete source. This type of pollution is often the cumulative effect of small amounts of contaminants gathered from a large area. A common example is the leaching out of nitrogen compounds from fertilized agricultural lands. Nutrient runoff in storm water from “sheet flow” over an agricultural field or a forest are also cited as examples of non-point source pollution. The U.S. Clean Water Act defines point source
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