Washington State's Technology Assessment Protocol – Ecology program has evaluated the performance of stormwater treatment technologies for more than 20 years. Administered by the Washington State Department of Ecology and supported by the Washington Stormwater Center at the University of Washington, TAPE uses a science-based, peer-reviewed process to assess pollutant removal effectiveness under real-world conditions. Technologies meeting performance goals for total suspended solids, dissolved copper and zinc, total phosphorus and total petroleum hydrocarbons are approved for use in Washington. The TAPE protocol also requires analysis of screening parameters, pollutants lacking current treatment requirements but commonly driving TMDLs in receiving waters, including fecal coliform, E. coli, total Kjeldahl nitrogen, nitrate/nitrite, orthophosphorus, and total copper and zinc. This presentation offers a first look at concentrations of these pollutants observed across multiple TAPE evaluations conducted over the past 15 to 20 years, with preliminary findings on pollutant removal effectiveness across different categories of stormwater control measures.