Pathogen Removal Performance of Best Management Practices In Charlotte andWilmington, North Carolina

Hathaway, J.M., Hunt, W.F., Wright, J.D., Jadlocki, S.J.

Pathogens are a target pollutant in many parts of North Carolina, particularly in areas that drain to shellfish waters. Single storm limits have been established for pathogen indicators in fresh water (200 cfu/ 100 ml for fecal coliform, 126 col/100 ml for E. coli, and 33 cfu/100 ml for enterrococcus) and marine waters (35 cfu/100 ml for enterrococcus) being used as full body recreational areas in an attempt to reduce public health risks. Runoff samples collected in coastal counties have often exceeded fecal counts of 20,000 cfu/ 100 ml (Bright 2007). The NCSU Biological and Agricultural Engineering Department monitored 14 total stormwater BMPs, 9 in Charlotte, NC, and 5 in Wilmington, NC, to evaluate their efficiency with respect to indicator bacteria removal. The study locations included 2 bioretention areas, 4 stormwater wetlands, 3 wet ponds, 2 dry detention, and 3 proprietary BMPs.