Condos are often on a shared water system. The pipes run from one unit to the next, or they’re all fed off one (or more) main valves. Shutting off the service to one unit may mean shutting off the service to all of the units in the complex. If you need plumbing work done on your unit, you need to schedule water shut off with your HOA (Homeowners Association) or property management company. Some townhomes have their own main water shut-off valve, which can be found either inside or outside, but you should still check with your Association before shutting off the water.