What is class of use?

WDEQ has a series of classifications for groundwater which specifies what the water can safely be used for. Each classification has its own limits on the concentration for different substances, and include (in descending order of quality) domestic, agricultural, livestock and industrial use classifications. By WDEQ standards, the aquifer within which the Ross ore body is located will likely be classified as not currently fit for human or livestock consumption, and will be considered industrial-use only due to high radionuclide concentrations (primarily radium).