around here, Culigan water is carbon filtered and run through a weak reverse osmosis filter.
I don't think its terribly standardized. Aside from calling a local Culligan facility and digging deeper, you'll likely have to send the water to a lab for analysis.
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10