POLLUTION LOCATOR| Water | Leading Sources of Water Quality Impairment

Region Name:      Middle Potomac-Anacostia-Occoquan Watershed
HUC8 Code:      02070010


Rivers, Streams, and Creeks Number of
Impairments
Percent of all
Impairments
Nonpoint Sources 30 57%
Impairment source not reported 16 30%
Natural Sources 8 15%
Unknown Sources 7 13%
Combined Sewer Overflows 5 9%
Municipal Point Sources 4 8%