Water samples and macroinvertebrates were collected from three stations of Finley Creek, Indiana before and after a surface cleanup of an adjacent hazardous waste disposal site. Water quality parameters: iron, total dissolved solids, conductance, hardness, total suspended solids and pH were compared between stations and years. The water quality above the landfill was high but decreased downstream. The water below the disposal site contained high levels of chemicals in both studies. However, the concentrations of chemicals were lower in the water two years after the cleanup.Numbers of macroinvertebrates and the number of taxa were determined and species diversity indicies were established. The results showed a statistically significant increase in macroinvertebrate taxa and mean species diversity indicies below the waste disposal site after the cleanup. These results indicate an improvement of water quality. / Department of Natural Resources