Version History for Data Release: Lisle, J.T., 2020, Microbial nutrient cycling in the Upper Floridan Aquifer (ver. 2.0, February 2021): U.S. Geological Survey data release, https://doi.org/10.5066/P9EOM5RC. ________________________________________________________ Version 1 posted online July 20, 2020 ________________________________________________________ Version 2.0 revised and reposted online February 26, 2021 Changes in version 2.0 1. Added inactivation data for E. coli, MS2 bacteriophage, polio virus, and Cryptosporidium parvum in the Upper Floridan Aquifer.