Pollution

Colorado Stone Quarries must rehabilitate streams they illegally diverted in 2018, but some say even more needs to be done.

A synthetic chemical’s appearance in public water supply wells raises questions of how to protect the public from unknown health hazards.

A wetland protection case being reviewed by the U.S. Supreme Court will determine which bodies of water can be federally regulated.

One year after it launched one of the largest lead treatment programs in the United States, Denver Water is slightly ahead of schedule.

This photo gallery contains images taken by drone for our story on acid mine drainage in Colorado, which featured the Captain Jack Mill Superfund site near Ward, Colorado. DateJuly 18,...

Colorado water officials hope to combat algae blooms caused by rising temperatures and an increased use of phosphorus-laced lawn fertilizers.

Dust suppression and habitat restoration are key elements in a plan to aid the Salton Sea, whose ills have been a sore point in Colorado River management.

The variability in pollution laws nationwide may be caused by the EPA not requiring state enforcement.

Since state officials began a more focused monitoring effort six years ago to detect toxic algae blooms in Colorado’s lakes and reservoirs, testing has documented harmful levels of such toxins three times on the Western Slope.

Scientists fear that eventually the toxic residue of more than a century of agricultural runoff will be blown into the air — and into the lungs of residents.