Water Quality Survey of the Rock River prepared for the Iowa Department of Environmental Quality by the University of Iowa Hygienic Laboratory, January 1978

(1978) Water Quality Survey of the Rock River prepared for the Iowa Department of Environmental Quality by the University of Iowa Hygienic Laboratory, January 1978. University of Iowa

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Abstract

A water quality study of the Rock River was conducted during January 1979. Water samples from 15 stream stations were collected in assessing the winter water quality and evaluating water quality changes that may have occurred since previous studies. In addition to the stream sampling, five municipal wastewater effluents were sampled. Results of the survey indicate below average water quality throughout much of the river reach. Two violations of the Iowa water quality standard for dissolved oxygen occurred below Rock Valley and were probably due to the cumulative effect of several waste dischargers. The town of Hull was the only wastewater treatment facility not in compliance with its discharge permit limitations. Based on the current wastewater treatment plant effluent limitations, winter water quality of the Rock River is not expected to change except during high flow periods.