Wildcat Marsh is the wetlands delta formed by the mouth of Wildcat Creek at its confluence with Castro Creek in Richmond, California.[1] The marsh is critical habitat for endangered species[1] and has been contaminated[2][3] and damaged[1] by runoff from the Chevron Richmond Refinery,[2][3] the city's landfill,[1] and a salvage yard.[1] The marsh was isolated from tidal effects, but restoration efforts are underway[1] as is the closure of the landfill[1] and cleanup of the mudflats contaminated by mercury[2][3] and PAHs[2][3] from the refinery.[2][3]