Livestock waste management issues are of growing environmental concern in the United States and elsewhere. Lowering the quantity of nutrients excreted by pigs can ease associated environmental problems and at the same time can reduce waste management costs. Reduction in nutrient excretion can be achieved by feeding pigs with low crude protein diets. The paper develops a procedure for calculation of swine waste management costs as function of four dietary regimes. Feeding low crude protein diets significantly reduced amount of nitrogen excreted by pigs. As a result, reduction in waste management costs may be achieved, especially when the pig farm does not have enough land to apply all the manure it generates.