Colorado's chief medical officer said preliminary water test results look promising. The EPA isn’t ready to draw any conclusions.
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Water samples taken after the spill showed lead concentrations in some places that were 3,500 times the normal levels.
The majority of Americans favor government action, but the candidates — and big donors — differ greatly. Here is what they've said on the topic, beginning with whether climate change is real.
In the meantime, state agencies are helping the EPA determine the environmental and health impacts of the accident.
EPA toxicologist Deborah McKean says the sludge laced with heavy metals moved so quickly after the spill that it would not have harmed animals that consumed it.
Southwestern Colorado residents still need to steer clear of the Animas River, officials say.
The explosion that sent flames several hundred feet into the air and touched off a small grass fire.
Nearly 80,000 people have made the hike to Hanging Lake already this year, up from 50,000 for the same period in 2014.
Officials say they hope to add up to 250 additional employees in their Windsor and Brighton manufacturing plants.
Northern Water wants to build two large reservoirs using the Cache la Poudre's water. History suggests it won't be easy.
Overall, federal government wants to reduce emissions by 32 percent over the next 15 years. Colorado appears well positioned to meet that goal.
Last week, Boulder Mayor Matt Appelbaum signed onto a climate change proclamation at the Vatican.
The non-partisan Pew Charitable Trusts commissioned the poll of 600 voters in all 11 Western states with sage grouse habitat.
According to state data, the average lifespan of an oil or gas well is 12 years. But that figure can vary depending on which basin you're looking at.