Allison H. Roy, Heriberto Cabezas, N. Theresa Hoagland, Audrey L. Mayer, Matthew A. Morrison, William D. Shuster, and Hale W. Thurston are with USEPA’s Office of Research and Development National Risk Management Research Laboratory in Cincinnati, OH.
Matthew P. Clagett and Joshua J. Templeton are research associates with the National Research Council.
We thank Andrew Swift from CAGIS for providing classified land cover and impervious surface cover outlines from digital orthophotos. Yu Zhang assisted with hydrologic data. Joyce Simpson (University of South Florida) and Laura Boczek (USEPA) provided microbial data. We thank Michael Goss (USEPA) and EPA Region 5 for providing nutrient data. The views expressed herein are strictly the opinions of the authors and in no manner represent or reflect current or planned policy by the USEPA.