If your water pressure is lower than usual, it can indicate a plumbing problem that needs to be repaired. Some potential reasons for the reduced water pressure can include: There are too many plumbing fixtures running at the same time. There are faulty fixtures, like showerheads or faucets. There is a broken pressure regulator. This valve is meant to stabilize the water pressure in your home. There are closed valves that prevent your water supply from traveling through them. There are clogged pipes disrupting the water flow through the pipes.