Pollution that comes from non-point source contamination in urban and rural land-use activities spread out across a catchment or sub-catchment. Examples of true non-point sources are sheet run off from fields or seepage of nutrients from soil into ground water. Examples of minor point sources are field drains or surface water drains in urban areas. Diffuse sources are often individually minor, but collectively significant.
News: Diffuse pollution
July 2, 2011