RockTalk: Water Quality in Colorado Download Publication Details This edition of RockTalk discusses the ways in which geology can determine water quality. Digital PDF download. RT-03-02D Excerpt: Geology and Water Quality Fortunately, Colorado is blessed with large supplies of clean water, much of it in the form of snowmelt runoff from the Rocky Mountains. As the snowmelt and rain enter streams and percolate into the ground to replenish ground water aquifers, the water flows over and through various kinds of rock. This interaction changes the composition of the water. Citations Colorado Geological Survey. “RockTalk V03N2, April 2000 - Water Quality in Colorado.” RockTalk, April 2000. https://doi.org/10.58783/cgs.rt0302.fihm4524. CGS Publications. https://coloradogeologicalsurvey.org/publications/rocktalk-water-quality-colorado/.