Originally Posted by Biobrewer
Just moved from Madison about a year ago after finishing grad school. The one issue about Madison is that given areas get their water from a number of different wells. I called the water utility and tried to figure out what well was being used at any specific time. They said they could not tell me that with any certainty, as the well is constantly changing, or they are drawing from several wells at a time for a given area. All you can really do is average all the wells, and hope for the best. Turned out well for me (no pun intended).
I just posted this up on the Wine & Hop Shop Facebook page, and I'll put it here too (should help you zero in on which well you're drawing from):
If you're interested in all the brewing-relevant minerals/ions/elements in the water coming from your tap at home, take a look at the following links provided by the folks at the City of Madison Water Utility and the Wisconsin State Laboratory of Hygiene:
This link will tell you the well from which your tap water is drawn -- and during which time of year/season. Just plug in your street address:http://www.cityofmadison.com/water/waterQuality/testing/inorganics.cfm
Then, here's the 2011 Inorganic Analyses Summary for all the wells in Madison:http://www.cityofmadison.com/water/waterQuality/testing/documents/IOC.2011.0811.pdf
In a few weeks, the 2012 reports will be found here:http://www.cityofmadison.com/water/waterQuality/testing/inorganics.cfm
One note: The Inorganic Analyses Summary is still the averages of samples drawn from the wells, so it may not be exactly the numbers coming out of your faucet. But, it gets you much closer to what's in your water than the annual city-wide averages of all the wells sent out in the mail.
Once again, a big thanks to the folks at the Madison Water Utility and the Wisconsin State Laboratory of Hygiene!