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Results of a water-quality study conducted during 1995-97 in the Santee River Basin and coastal drainages of North and South Carolina indicate that nutrient, pesticide, and suspended sediment concentrations generally are low. Some concentrations of total phosphorus in the study area exceeded the U.S. Environmental Protection Agency recommended maximum of 0.10 milligrams per liter. Median total phosphorus concentrations were highest in the South Fork Catawba River, N.C. (0.14 milligram per liter). Insecticides such as diazinon, malathion, and parathion were detected primarily at urban sites. Some pesticides were detected at levels above published guidelines for the protection of aquatic life, including aldicarb sulfoxide, chlorpyrifos, diazinon, malathion, and parathion. None of the pesticide concentrations exceeded the maximum contaminant level or lifetime health advisory level for the protection of drinking-water quality and human health. Median suspended sediment concentrations were highest in the South Fork Catawba River (17 milligrams per liter). Urban sites had significantly higher suspended sediment concentrations than other sites that were sampled. Fecal coliform and fecal streptococcus concentrations were variable. Nine of 13 sites had fecal coliform concentrations greater than 400 colonies per 100 milliliters of stream water. Concentrations ranged from less than 1 to almost 22,000 colonies per 100 milliliters, and individual concentrations were highest at agricultural sites. Fecal streptococcus concentrations ranged from 2 to more than 20,000 colonies per 100 milliliters, and medians were highest at agricultural sites. Synoptic studies were conducted in two basins-Gills Creek Basin was sampled in September 1996, and the South Fork Catawba River Basin was sampled in October 1997. Nutrient concentrations generally were low in both basins. Phosphorus concentrations were higher in the South Fork Catawba River Basin than in the Gills Creek Basin. In the Gills Creek Basin, 10 different pesticides were detected above an adjusted minimum reporting level of 0.01 microgram per liter, and one pesticide, diazinon, was detected at a concentration above the aquatic life standard. Fecal coliform concentrations were greater than 400 colonies per 100 milliliters in about half of the sites in each synoptic study basin. Suspended sediment concentrations generally were low in both basins, except where samples were collected directly downstream of turbulent water.

water-resources investigations report

Spatial and seasonal variability of nutrients, pesticides, bacteria, and suspended sediment in the Santee River basin and coastal drainages, North and South Carolina, 1995-97