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Table 19.3--Interrelationship between common sources and causes of pollution

Source of impairment	Siltation (sediment)	Pathogens (bacteria)	Nutrientsa	Organic enrichment	Pesticides	Metals	Habitat modification
Point sources
Municipal		X	X	X		X
Storm sewers/urban runoffb	X				X	X
Industrial	X	X	X	X	X	X	X
Land disposalb		X	X	X		X
Nonpoint sources
Agriculture	X	X	X	X	X		X
Hydrologic/habitat	X		X	X	X		X
modification
Resource extraction	X					X	X
Construction	X
Silviculture	X		X	X	X		X
Natural	X	X	X	X		X	X

^a Nutrients include nitrogen and phosphorous.




^b Storm sewers/urban runoff and land disposal include both point and nonpoint sources.




Source: U.S. Environmental Protection Agency 2000a