I have a link to the .pdf from our local water company, a detailed water quality report. Thanks to this forum, I would not have known to look for it!

http://www.amwater.com/files/MO_2010519_CCR.pdf

And the typical water report, showing the CaCO3 (calcium carbonate?) levels:

http://www.amwater.com/files/MO_2010519_TWQ.pdf

This is where I got my info about the fill water. Rather nice, I must say, saves me from having to do several bucket tests.