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The Best Management Practices (BMPs) are widely applied in the United States to treat stormwater from urban, highway to agricultural areas. Individual and site metals event mean concentration (EMC), flow volume, mass loading and removal rate data (dissolved Arsenic, total Arsenic, dissolved Cadmium, total Cadmium, dissolved Chromium, total Chromium, dissolved Copper, total Copper, dissolved Lead, total Lead, dissolved Nickel, total Nickel, dissolved Zinc, total Zinc) in stormwater runoff, were retrieved and calculated from the international stormwater BMP database in order to evaluate the effectiveness of different biofilters (grass strip and grass swale). Paired test results indicate that both grass swale and strip were effective in most metals treatment and flow volume reduction. Correlation analysis shows the outflow volume, concentration and mass loading can be indicated from inflow information.