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 ›
Groundwater pumping at a uranium mine near the Grand Canyon will affect the canyon's springs, scientists says.
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How does Colorado River water get divvied out to Colorado, Utah, Arizona, New Mexico, Nevada, California, Wyoming, Native American tribes, and Mexico?
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Did you know the Colorado River used to be called the Grand River? Learn about the name change and more fun facts about this hardworking river.
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