Clogged or Faulty Fixtures: Fixtures themselves, such as showerheads or faucets, can become faulty or clogged over time. In some cases, simply cleaning out the screen or aerator is enough to fix the issue, but at other times, an entire fixture may need to be replaced. To clean the aerator, unscrew the nozzle and look for signs of buildup. If the piece needs to be cleaned, soak it in a vinegar-water solution; if that doesn’t work, buy a replacement. While the aerator is off, turn on the faucet to confirm that is the issue. If low water pressure persists, the problem may not be the aerator after all but rather a clog in the line to the fixture. Clogged lines are best handled by a plumber.