 Pollutants found at hazardous level in the creek have included fecal bacteria, copper, ammonia, and zinc.The creek's headwaters area is a historic habitat for a number of rare and endangered species including Sebastopol meadowfoam, "Limnanthes vinculans"; showy Indian clover, "Trifolium amoenum"; and Pitkin Marsh lily, "Lilium pardolinum" ssp "pitkinese".This area also contains a closed landfill, and as of 2006, a hard rock quarry was proposed for it.