Some people mistakenly assume that Dubuque’s water comes from the Mississippi River. It does not. Instead, our water comes from a series of wells that pull water from underground aquifers. Our water is partially supplied by the Jordan Aquifer (also known as the Cambrian-Ordovician Aquifer) and we also draw from the Mt. Simon Aquifer and Alluvial Aquifer. Of the nine wells Dubuque currently uses for our city water supply, there are four deep wells (1,000 ft.-1800 ft.), two that draw from the Jordan and two from the Mt. Simon Aquifer. We also use five shallow wells (200 ft.) which draw from the Alluvial Aquifers.