This document is part of a series of research reports that describes the results of investigations funded under the Alberta Oil Sands Environmental Research Program, which was established by agreements of the Governments of Alberta and Canada in February 1975. This ten year program was designed to direct and co-ordinate research projects concerned with the environmental effects of development of the Athabasca Oil Sands in Alberta. This report documents and appraises baseline water chemical quality conditions of a lake and streams within the Muskeg River Watershed.