I'm in Chicago's NW burbs and have Lake Michigan water that I have been using for brewing for about 16 years. I had Ward Labs test it in 2006 and again in 2009 and the numbers were almost identical. I've also had some other local brewers compare numbers and it always seems to be very close... within a couple of ticks. But I'm suspicious of some changes lately (especially when it comes to pH) so I'm checking to see if anyone with my water has had a Wards analysis done lately. If not, I will probably submit a sample. Thanks gang.