Gallatin County, Montana
Are there any controlled ground water areas in the Gallatin Valley?
Gallatin Local Water Quality District
Yes, there are two controlled ground water areas which have been designated within the Gallatin Local Water Quality District boundary:

Bozeman Solvent Site Controlled Ground Water Area.  Located in the City of Bozeman at the old Buttrey's Shopping Center location and extending northward beyond I-90 and Frontage Road.

Idaho Pole Company Site Controlled Ground Water Area.  Located in Gallatin County northeast from the City of Bozeman.