Although Lake Erie is still an excellent source of municipal raw water, the effects of pollution are becoming ever more discernible. The report presents the results of a 1967-1968 survey. The dissolved solids have increased by nine percent since 1964 with progressively higher concentrations from west to east. Most chemical constituents in both water and sediment have increased during the same period. High populations of phytoplankton. Bloom conditions were not noted during the 1967-68 sampling period. Pollution-sensitive types, such as sludgeworms and bloodworms, were in profusion. The limited winter program revealed higher bacterial densities in western basin bottom waters as opposed to the nonwinter 1963-64 findings where the highest densities were found in the surface waters.