Agricultural drainage ditches are commonplace on Maryland's eastern shore and represent a major transport pathway for nutrients and sediments to surface-water bodies. They also represent a possible intervention point for removal of non-point pollution. Two filtration systems were installed on Maryland's eastern shore. The first was a P removal structure filled with an aluminum oxide, iron oxide and a calcium sulfate/carbonate rich residual derived from the treatment of acid mine drainage, installed in August 2006 on a small ditch draining 2.5 ha. The second was a gypsum bed filtration system, installed on a larger, Public Drainage Association ditch draining 18 ha in April 2007. We will report on the performance of these ditch filtration systems in terms of cost of filtration system construction and maintenance, availability and environmental safety of the PSMs, P-sorption efficiency, and cost of disposing of P-saturated PSMs, all of which are determining factors for the feasibility of wide-spread adoption of these practices.