Revision History for U.S. Geological Survey Fact Sheet 2019-3057 By James A. Kingsbury Groundwater Quality in the Ozark Plateaus Aquifer System, Central United States ----------------------------------------------------- Posted online March 31, 2020 ----------------------------------------------------- Revised and reposted September 16, 2020 The following changes were made to the fact sheet: On the front page, the version number "ver. 1.1" was added and the month of publication was changed from "March 2020" to "September 2020." On page 3, in the table, the constituent Iron, including its benchmark data, was deleted. On page 3, in the table, the constituent Molybdenum, including its benchmark data, was deleted and replaced with Strontium with a type of HBSL and a 4,000 ppb value. On page 3, in the table, the constituent Fluoride's type changed from MCL to SMCL and the value to 2 ppm.