TM21-01 Reload of mercury results in 19 water samples collected April-June 2020

This memorandum alerts users of the U.S. Geological Survey National Water Quality Laboratory (NWQL) of revisions to results provided through the National Water Information System (NWIS, https://waterdata.usgs.gov/nwis) for 19 samples analyzed for mercury in unfiltered or filtered water samples collected from April 28–June 28, 2020.