Sediments contaminated with pollutants are widespread
in U.S. coastal waters. Industrial, agricultural, household
cleaning, gardening, and automotive products and
wastes regularly end up in coastal waters. Industries
that are located in or upstream of urban ports discharge
wastes directly into waterways. Dense populations
contribute contaminants through sewage discharges,
automobile emissions, and other waste generating activities.
Stormwater runoff also carries contaminants from
distant sources.