On May 20, 2024, the Grand Canyon Trust submitted comments on the Arizona Department of Environmental Quality's proposed rulemaking to update aquifer water-quality standards that are out of compliance with Arizona law. As of that date, the state of Arizona had no aquifer water quality standard for uranium, for example. The Trust urged state regulators, among other things, to establish water-quality standards that are, at a minimum, equivalent to the federal maximum contaminant levels for seven pollutants, including arsenic and uranium. Download your own PDF copy of the letter ›
The ongoing flooding problem at uranium mine near the Grand Canyon, continues.
Read MoreDr. Laura Crossey explains what scientists know about groundwater in the Grand Canyon region.
Read MoreChallenging conditions have endangered, threatened, or imperiled these five native fish in the Grand Canyon.
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