Tracking Zinc and Copper from Residential Surface Runoff: A Case Study in Washington County

Abstract Submission: Understanding spatial and temporal trends is essential to identify and quantify pollution sources in municipal stormwater. This knowledge is key to developing adaptive management strategies to improve surface runoff water quality and protect river ecosystems. For over a decade, Clean Water Services has monitored five stormwater sites with varying land uses as part of MS4 (Municipal Separate Storm Sewer System) compliance. These sites include two industrial, two residential, and one commercial area. However, a recent evaluation found no consistent water quality patterns within each category. Stormwater runoff is complex due to intermittent discharges, large drainage areas, diverse land uses, and multiple pollutant sources. This study focuses on zinc and copper levels in residential areas, where high concentrations of these metals have been observed. Two main objectives are proposed: 1) to determine whether the zinc and copper trends are unique to current sites or prevalent across similar regions, and 2) what factors might predict these trends. To strengthen the study, three additional sampling sites will be selected using geographic information system (GIS) analysis. The selection will consider just residential land use, traffic counts, socioeconomic factors, drainage areas, development age, and impervious surfaces. By comparing sites with similar characteristics, the analysis aims to establish a pattern between residential areas and the presence of these metals. This will facilitate the development of a strategic and adaptive management plan to address these pollutants before they reach the waterways.

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