If you're interested in finding information on your own water source, here are a couple links to investigate.
This link takes you to the Sauk Rapids City Drinking Water Report. You'll find information about the source of our public water supply, as well as contaminant levels.
This link takes you to the Minnesota County Well Index, where you can search for your well by typing in your address. Click on your well, and you will find everything you need to know in order to draw a complete sketch of your aquifer! You'll see which layers of rock or material the well drillers passed through in order to locate a water-bearing aquifer, how deep your well is, when it was drilled, etc.
Finally, this link will give you a source water assessment, which gives you details about what is in your water, and possible threats to your water supply.