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Very slow permeability and shallow seasonal water tables are among the soil conditions that limit the ability of leaching trenches to renovate domestic wastewater in Clermont County, southwest Ohio. The Wisconsin Mound, which has been used in the county since 1985, compensates for these soil conditions to provide renovation, but has not been a popular alternative due to the size of the mound required. Low profile modified mounds in combination with four types of secondary treatment technology, including fixed film aerobic treatment, intermittent sand filtration, peat filtration and suspended growth aerobic treatment, are being offered to Health District residents as alternatives to the Wisconsin Mound. A study to be completed in Winter 2000/2001 is examining systems installed on very poorly drained Clermont Silt Loam soil. Raw influent, secondary effluent prior to soil application, and water from a gradient drain at the perimeter of the modified mounds are being sampled and tested for Fecal Coliform, TSS, BOD5, NH3, and Total-P. Preliminary sampling data indicate that these modified mound designs may provide excellent renovation of domestic wastewater on Clermont Silt Loam soil.