Why Is My Water Pressure Low?
Low water pressure in Phoenix homes is usually caused by mineral buildup from hard water, a failing pressure regulator, partially closed valves, or hidden leaks. Start by checking that all valves are fully open and cleaning your aerators. If the problem persists throughout the house, you likely need professional diagnosis.
Common Causes
Mineral Buildup in Pipes
Phoenix's hard water (12-20 GPG) leaves mineral deposits that accumulate inside pipes over time, gradually restricting water flow. This is especially common in homes with galvanized steel pipes or homes without water softeners.
Partially Closed Shut-Off Valve
The main water shut-off valve or individual fixture valves may not be fully open. This often happens after repairs or maintenance when valves aren't reopened completely.
Pressure Regulator Failure
Most Phoenix homes have a pressure regulator (PRV) that reduces incoming water pressure to safe levels. When these fail, they can restrict pressure. PRVs typically last 10-15 years.
Hidden Leak
A leak in your main water line or under-slab pipes diverts water before it reaches your fixtures, reducing pressure throughout the house. Watch for unexplained increases in your water bill.
Municipal Supply Issues
Sometimes the problem isn't in your home at all. City water main breaks, maintenance, or high neighborhood demand can temporarily reduce pressure. Check with neighbors to see if they're experiencing the same issue.
Corroded or Undersized Pipes
Older homes may have corroded galvanized pipes or undersized supply lines that can't deliver adequate pressure, especially when multiple fixtures are running simultaneously.
What Should You Do?
Try This First
- Check all shut-off valves to ensure they're fully open
- Clean faucet aerators and showerheads (soak in vinegar overnight)
- Ask neighbors if they're having similar pressure issues
- Check your water bill for unusual increases that might indicate a leak
- Locate and inspect your pressure regulator (usually near the main shut-off)
Call a Pro If...
- Pressure is low throughout the entire house, not just one fixture
- You've checked valves and aerators with no improvement
- Your water bill has increased unexpectedly
- Your home has galvanized steel pipes (common in pre-1970 homes)
- You hear running water when nothing is on
- Pressure has gradually decreased over months or years