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The ability of a moderately well drained soil to treat septic tank wastewater at depths of 1, 2, 3, and 4 feet beneath the surface was evaluated using drip dispersal technology. Three drip dispersal systems of 1200 lineal feet of tubing each were dosed with 400 gpd septic tank treated wastewater (loading rate of 0 .17gpd/ft2.). Zero tension lysimeters were installed at 1, 2, 3, and 4 feet beneath the surface to capture gravity water moving through the soil. Samples were analyzed for Fecal Coliform, Fecal Strep, BOD5, NH3-N, NO3-N, and Soluble P. Median value reductions of 99% for Fecal Coliform, 99% for Fecal Strep, 86% for BOD5, 85% for NH3-N+NO3-N and 90% Soluble P were obtained at the 1 foot lysimeters. Based on these trials 1 foot of aerobic soil appeared to provide significant treatment of septic tank wastewater when loaded at 0.17gpd/ft2 with a landscape linear load of approximately 6gpd/ft.