Denver CO metro: water quality. Denver Water serves 1.5 million people in the city and surrounding suburbs, drawing from a collection of mountain
Denver Water serves 1.5 million people in the city and surrounding suburbs, drawing from a collection of mountain reservoirs along the South Platte River and its tributaries. Colorado Springs, 60 miles south, operates its own system from Pikes Peak watershed sources. Aurora and Lakewood purchase from Denver Water or run supplemental systems. The broader metro of 2.9 million people depends on snowpack – and as Colorado's winters have become less predictable, that dependency has become a growing vulnerability.
The Front Range's water is generally high quality at the source. Cold mountain streams, limited upstream development, and protected watersheds give Denver an advantage over cities drawing from rivers that run through agricultural or industrial zones. The question is what happens to that water in the metro itself.
Peterson Space Force Base (formerly Peterson Air Force Base) in Colorado Springs has been the primary PFAS hotspot in this metro. The Air Force confirmed PFAS contamination from AFFF use, with groundwater plumes affecting the Widefield and Security-Widefield areas south of Colorado Springs. The contamination was severe enough that the Air Force installed carbon filtration systems for affected water providers and supplied bottled water to some households.
Buckley Space Force Base in Aurora is another site under investigation. The Colorado Department of Public Health and Environment (CDPHE) has been sampling groundwater around both installations and publishing results.
Denver Water's mountain reservoir supply has shown minimal PFAS in UCMR5 testing – low or non-detect levels consistent with a protected high-elevation watershed. Colorado has not adopted state-specific PFAS MCLs but issued a 70 ppt combined health advisory for PFOA and PFOS in 2020, since superseded by stricter federal standards.
According to CDPHE data from 2024, five water systems in the metro reported PFAS detections above 4 ppt under UCMR5, all of them in the Colorado Springs and Aurora areas rather than core Denver.
Denver proper sits in an enviable position – mountain-sourced water with minimal upstream contamination. The military contamination near Colorado Springs and Aurora creates a split within the metro that mirrors what cities like Seattle and San Diego experience: clean core supply, localized hot spots near bases.
Among western metros, Denver's water quality compares favorably to Phoenix (hard Colorado River water, military PFAS) and Las Vegas (entirely Colorado River-dependent). The altitude and cold climate also reduce disinfection byproduct formation compared to Sun Belt cities.
Visit our Colorado state page for statewide context.
Your risk depends heavily on which part of the metro you're in. Core Denver on Denver Water? Relatively low concern. Security-Widefield near Peterson SFB? High priority for monitoring and filtration.
Check your water to see data specific to your provider. If you're in the Colorado Springs or Aurora area, our detailed report can show you how contamination levels have changed since military remediation began. For filter options, our water filter guide matches technology to your local water profile.