Our carwash drilled a 600' artesian well last summer. It has a static level of 50' and produces 3-4 gpm.
We had the water tested and, based on test results and well supply estimates vs wash usage, have decided to use well supply for HP rinse on IBA and SS bays (both cold at this wash). We plan to leave hot supply on city water, which is softened. I'll also leave SFR on city supply.
Our wash is small (2+1) but pressure automatics are water hogs, so we expect a 2-3 year payback on the well and system. This project has taken alot of time and hoop jumping w/city departments all wanting paperwork signed, approved, resubmitted etc.