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Fecal-indicator bacteria in streams alonga gradient of residential development

January 1, 2002

Fecal-indicator bacteria were sampled at 14 stream sites in Anchorage, Alaska, USA, as part of a study to determine the effects of urbanization on water quality. Population density in the subbasins sampled ranged from zero to 1,750 persons per square kilometer. Higher concentrations of fecal-coliform, E. coli, and enterococci bacteria were measured at the most urbanized sites. Although fecal-indicator bacteria concentrations were higher in summer than in winter, seasonal differences in bacteria concentrations generally were not significant. Areas served by sewer systems had significantly higher fecal-indicator bacteria concentrations than did areas served by septic systems. The areas served by sewer systems also had storm drains that discharged directly to the streams, whereas storm sewers were not present in the areas served by septic systems. Fecal-indicator bacteria concentrations were highly variable over a two-day period of stable streamflow, which may have implications for testing of compliance to water-quality standards.

Citation Information

Publication Year 2002
Title Fecal-indicator bacteria in streams alonga gradient of residential development
DOI 10.1111/j.1752-1688.2002.tb01550.x
Authors Steven A. Frenzel, Charles S. Couvillion
Publication Type Article
Publication Subtype Journal Article
Series Title Journal of the American Water Resources Association
Series Number
Index ID 70024783
Record Source USGS Publications Warehouse
USGS Organization Alaska Science Center