Not being from Utah pardon my intrusion, but I do live in the dryest state in Australia so I can see your concern. As stated I dont think our hobby/profession (as the case may be) is going to break the water table, although you can chew up some water using fibre based paper in a continuous washer

For me doing cyanotype I can do a couple of 5x7 prints in an inch or two of water in two 8x10 trays. Im just stepping up to carbon and expect to do a print a tray. For washing film I use the fill, agitate and sit x3 rule so 2 sheets of 5x7 is maybe a pint or so. Not breaking the bank by any means: run the dishwasher one less time or dont wash the car or similar and you'll more than break even.