Definitions for "Nonpoint-source pollution"
water pollution that originates from various or diffuse sources; examples include stormwater runoff and streambank erosion (see point-source pollution).
Water pollution whose sources cannot be pinpointed to a specific outfall or pipe but that can be best controlled by proper soil, water, and land management practices. Oil washed off street during rainstorms is an example of nonpoint-source pollution.
resulting pollution from a widely dispersed land area that is carried in runoff water from a field, forest, or urban area into a stream, lake, or groundwater