https://www.berkeyfilters.com/pages/water-quality-search?pws=CO0103005 Uranium This Utility Provider: 1943.0pCi/L Federal Guideline: 1092.8pCi/L EWG Guideline: 430.0pCi/L Health Risk: Cancer Description: Uranium is a known human carcinogen. The federal legal limit for uranium is set at 30 micrograms per liter (corresponding to parts per billion), but utilities can also report uranium in picocuries per liter (pCi/L), which is a measure of radioactivity in water. EWG translated all uranium results to pCi/L using a conversion factor developed by the EPA. With this conversion approach, the limit of 30 ppb corresponds to 20 pCi/L. Drinking water with this much uranium would cause more than 4.6 cancer cases in a population of 100,000. California set a public health goal for uranium of 0.43 pCi/L.