pump room

from The Century Dictionary.

• noun A room connected with a mineral spring, in which the waters are drunk.
• noun The room of a waterworks where the pumps are located.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun dated, sometimes capitalized A room or structure at a spa where mineral water is drawn from a spring and consumed, often serving as a venue for polite socializing and conversation.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a pump house at a spa where medicinal waters are pumped and where patrons gather