The most common source of water pollution, polluted runoff (contaminated water flowing directly from city streets, parking lots, marinas, construction sites, logging sites, factory farms) threatens the public health and economy of the nation's coastal communities.
(contaminated water; flowing directly; from city streets) (parking lots, marinas, construction sites, logging sites, factory farms; threatens; the public health and economy of the nation's coastal communities)
contaminated water parking lots, marinas, construction sites, logging sites, factory farms
flowing directly threatens
from city streets
the public health and economy of the nation's coastal communities