EPA

The Environmental Protection Agency says it plans to end tracking carbon emissions in the U.S. But Northern Arizona University researchers say they’re ready to fill the void.

The Environmental Protection Agency has begun the cleanup of uranium mine waste in the Lukachukai Mountains near Four Corners on the Navajo Nation.

The Environmental Protection Agency has finalized a plan to clean up a million cubic yards of radioactive waste at abandoned uranium mines on the Navajo Nation near Gallup, New Mexico.

Arizona legislative leaders and the state Chamber of Commerce are suing the Biden administration over newly announced air-quality standards.

The Environmental Protection Agency had added a remote area on the Navajo Nation in northwestern Arizona to its Superfund National Priorities List.

The Environmental Protection Agency will ask property owners in Dewey-Humboldt to sample soil from their property as part of a cleanup plan for a Superfund mine site and smelter.

The Environmental Protection Agency has expanded a program to improve wastewater sanitation in 150 communities in the U.S.

The Environmental Protection Agency has finalized a plan for the cleanup of a Superfund site near Dewey-Humboldt.

The Environmental Protection Agency has reached two settlements over wastewater treatment plants on the Navajo Nation that were violating the Clean Water Act.

The Environmental Protection Agency has finalized a plan to cleanup a Superfund mine site on the Tohono O’odham Nation that's contaminated the tribe's drinking water with uranium and other pollutants.