Many past industrial and other land uses have left a legacy of contamination that impact our waterways to this day. The old Koppers wood treatment plant and Macalloy Corporation ferrochromium smelting plant sites are EPA Superfund sites. Clean up activities are complete at both sites and monitoring continues to this day. However, chromium levels in the sediment of Shipyard Creek near the Macalloy site continue to be among the highest in the world. Learn more about legacy pollutants in the Charleston Harbor watershed.