Riverbank filtration potential of pharmaceuticals in a wastewater-impacted stream

Authors

Paul M. Bradley, USGSFollow
Larry B. Barber, USGSFollow
Joesph W. Duris, USGSFollow
William T. Foreman, USGSFollow
Edward T. Furlong, USGSFollow
Laura E. Hubbard, USGSFollow
Kasey J. Hutchinson, USGSFollow
Steffanie H. Keefe, USGSFollow
Dana W. Kolpin, USGSFollow

Date of this Version

2014

Citation

Environmental Pollution 193, 2014

Comments

U.S. Government work

Abstract

Pharmaceutical contamination of shallow groundwater is a substantial concern in effluent-dominated streams, due to high aqueous mobility, designed bioactivity, and effluent-driven hydraulic gradients. In October and December 2012, effluent contributed approximately 99% and 71%, respectively, to downstream flow in Fourmile Creek, Iowa, USA. Strong hydrologic connectivity was observed between surface-water and shallow-groundwater. Carbamazepine, sulfamethoxazole, and immunologically related compounds were detected in groundwater at greater than 0.02 mg L^-1 at distances up to 6 m from the stream bank. Direct aqueous-injection HPLC-MS/MS revealed 43% and 55% of 110 total pharmaceutical analytes in surface-water samples in October and December, respectively, with 16% and 6%, respectively, detected in groundwater approximately 20 m from the stream bank. The results demonstrate the importance of effluent discharge as a driver of local hydrologic conditions in an effluent impacted stream and thus as a fundamental control on surface-water to groundwater transport of effluent-derived pharmaceutical contaminants.