Connoquenessing Creek, a tributary of the Beaver River, flows to the southwest out of Butler city and crosses the southern part of the township. In 2000, a scientific study was conducted to determine the health of the creek. Researchers discovered that only the Mississippi River received more toxic materials than the Connoquenessing, making the small river the second most polluted waterway in the United States. At the time, the Armco Inc. steel facility in Butler ranked first nationally for the amount of pollutant discharges. However, by 2010, due to reduced industry and clean up efforts, the creek's health has significantly recovered and has become popular for water-sport activities.