Hyoung Chang, The Denver Post
Kelsey Barton, a risk assessor at the Colorado Department of Public Health and Environment, takes notes at Fountain Creek Regional Park south of Colorado Springs on Wednesday, Sept. 9, 2020. She and a colleague cut tissue samples from fish to be tested for the PFAS “forever chemicals” that can build up at toxic levels. 
Getting your player ready...
Concentrations of PFAS – or forever chemicals linked to cancer and birth defects – detected in Thornton’s water supply exceed new federal health advisory levels by more than 1,000 times, city officials said.
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