Results of this nationwide search for documented case studies of impacts of urban runoff on receiving waters indicate that well-documented cases are scarce. Impacts previously attributed to urban stormwater runoff may be point source impacts in disguise, or they may be masked by greater contributions from other sources. Results for every urbanized area in the United States have been summarized by the quantity or urban runoff, the available dilution capacity in the primary receiving water, the number of times the urban area was cited as having a 'problem', the type of receiving waters, the impaired beneficial uses, and the problem pollutants. The report results suggest the need to intensify monitoring programs so that receiving water impacts can be more realistically evaluated.

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