The data reflect one sample taken every sixth day. A data table tutorial is available which explains how to use the data tables, terms, and how to download data files in multiple formats.
Data are available for all active monitoring locations provided by site and sample date.
One improvement will allow data to be posted on a monthly basis. Another change is the way very low or zero values are reported. In the past, if a particular compound was not detected in the analysis, the value was reported as 0.00. To view the data in an html format simply click and open the link provided on each data page. Permanent Site Sites listed in red are proposed monitoring locations or dates and are subject to change without notice.