Stormwater quality regulations continue to expand to include treatment criteria for total phosphorus. Phosphorus is now the second-most-regulated pollutant in stormwater runoff after total suspended solids. While much has been written about BMPs used to remove total phosphorus, we shouldn’t underestimate the role BMP maintenance has on reducing phosphorus levels. More specifically, we should take into account the timing of maintenance events and the type of maintenance being performed.

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