C.R.S. § 38-6-122

Cities and towns are granted the power of eminent domain both within and beyond their corporate limits, for the purpose of constructing or installing storm or sanitary sewers, septic tanks, disposal works, or electric lines, regulator stations, substations, and related facilities, such power to be exercised in the manner prescribed by law. Nothing in this section shall authorize the pollution or contamination of any public river, stream, or water.