Sunday Creek Watershed staff and Ohio Department of Natural Resources, Division of Resources Management staff work together to take monthly water quality samples of the stream and its tributaries.
The data for long-term sampling, short-term pre and post construction sampling can be accessed online at www.watersheddata.com. This website is maintained by the Ohio University Voinovich School of Leadership and Public Affairs. Biological data can also be accessed in the Non-Point Source Report that the Voinovich School publishes yearly.
Sunday Creek also has a United States Geological Survey gauge located just below Millfield in Athens County (03159246). The gauge calculates the flow in cubic feet per second (cfs) on the mainstem of Sunday Creek for a drainage area of 126 square miles. Data can be accessed online here.