A source of pollution that issues from widely distributed or pervasive environmental elements.
 cattle are the leading non-point source of pollution in Canada today
Compare with point source
 Example sentencesExamples
-  In its program, a state or territory describes how it will implement nonpoint source pollution controls, known as management measures.
 -  Shallow curtain drains that intersect untreated wastewater are an important source of nonpoint source pollution in Ohio and should never be used.
 -  As he points out, good forestry is part of the solution to nonpoint source pollution.
 -  Water bodies can violate water quality standards because of either point source or nonpoint source pollution.
 -  These factors are consistent with nonpoint sources such as septic fields, residential lawn fertilizers, and agricultural fertilizers.