Internal P loading from sediments to waterbodies may be a significant source of P and may prevent the attainment of surface water nutrient criteria developed by the USEPA. Our objectives were to 1) relate surface water P concentrations to sediment P and 2) determine if differences in land use were associated with water and sediment P concentrations in the ditches and streams that contribute to a major drinking water reservoir for the city of Indianapolis, IN. We will present relationships between water and sediment P concentrations in subwatersheds dominated by residential homes, row-crop agriculture, or livestock agriculture. The relative contribution of each subwatershed to total P loading also will be discussed.