Total Maximum Daily Load for Pathogen Indicators, Black Hawk Creek, 2006

(2006) Total Maximum Daily Load for Pathogen Indicators, Black Hawk Creek, 2006. Natural Resources, Department of

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Abstract

One segment on Black Hawk Creek was included in the 2004 Iowa 303(d) List as impaired by excessive indicator bacteria (fecal coliform) (Table 1). As such, total maximum daily loads (TMDLs) must be developed in accordance with the Clean Water Act (CWA). Based on the strategy of a basin wide approach as well as the hydrologic connections, TMDLs have been developed and included for the waterbody. In 2004, the Iowa Department of Natural Resources (IDNR) opted to convert from fecal coliform to E. coli bacteria as the indicator for primary contact recreation assessment. Although E. coli may be a better indicator of human health issues, because of data considerations and the fact that the TMDL is expressed as a percentage reduction in loading and the target is set at the E. coli standard, the analyses in this TMDL were based on fecal coliform. This document presents a TMDL for indicator bacteria that is designed to allow the Black Hawk Creek segment IA 02-CED-0370_ 1 to fully support the primary contact recreational designated use. The information contained herein should be considered 1 TMDL.