Low water pressure can make everyday tasks frustrating—whether it’s taking a shower, washing dishes, or doing laundry. If you’ve asked, “Why is my water pressure so low all of a sudden?” you’re not alone. This issue affects homeowners across the country, from older homes with outdated plumbing to brand-new builds with unexpected issues.
In this guide, we’ll walk you through 10 of the most common reasons why your water pressure might be low and exactly how to fix them.
Understanding Water Pressure in Your Home
Water pressure is measured in pounds per square inch (PSI). Most homes in the U.S. have water pressure between 40–60 PSI. If your pressure falls below this, you may start to notice weak water flow in showers, sinks, toilets, and appliances.
The source of your water pressure could be:
- City water supply (municipal systems)
- Private well systems
Understanding where your water comes from will help narrow down the problem.
10 Common Causes of Low Water Pressure (and How to Fix Them)
1. Clogged or Corroded Pipes
Over time, mineral buildup, rust, or debris inside your pipes can reduce water flow. This is especially common in older homes with galvanized pipes.
Solution: Hire a plumber to inspect your plumbing system and replace corroded sections. Pipe descaling or hydro jetting may also help.
2. Partially Closed Shut-Off Valves
Your home has two main valves: one near the water meter and one inside (often near the water heater). If either is partially closed, water flow will be restricted.
Solution: Make sure both valves are fully open. You can usually do this by turning the handle counterclockwise.
3. Failing Pressure Regulator (PRV)
Some homes have a pressure-reducing valve installed where the main line enters the home. A failing PRV may lower water pressure across all fixtures.
Solution: Replace the faulty PRV. This requires a licensed plumber.
4. Leaking Pipes
Even a small leak in your plumbing can cause a significant drop in pressure.
Solution: Check for visible signs of leaks under sinks, in the basement, or near your water heater. If unsure, call a plumber for a leak detection test.
5. Old Fixtures with Built-Up Sediment
Aerators and showerheads can become clogged with sediment, especially in areas with hard water.
Solution: Remove the aerator or showerhead and soak it in vinegar overnight. Replace any fixtures that are beyond cleaning.
6. Municipal Supply Issues
Sometimes, the issue isn’t inside your home at all. City-wide issues, nearby construction, or line flushing may reduce pressure temporarily.
Solution: Call your city’s water department to check for known problems in your area.
7. Faulty Water Heater
If you notice low pressure only on the hot water side, the issue might lie with your water heater.
Solution: Flush the water heater to remove sediment buildup. If the problem persists, it may be time to repair or replace the unit.
8. Shared Supply Line or High Demand Times
If your home shares a water supply line with neighbors or experiences low pressure during peak hours, demand might exceed supply.
Solution: Consider installing a water pressure booster or upgrading your main line if allowed by local code.
9. Well Pump or Pressure Tank Issues (Well Systems Only)
If you’re on a well system, problems with the pressure tank or well pump can affect overall water flow.
Solution: Have a professional inspect your well equipment, pressure switch, and tank.
10. Backflow Prevention Devices or Water Softeners
These systems can sometimes malfunction or become clogged, restricting water flow.
Solution: Check and clean or replace the backflow preventer and softener components as needed.
Quick Fix Chart: Troubleshooting Low Water Pressure
| Problem | Where You’ll Notice It | Quick Fix |
|---|---|---|
| Clogged aerator | Faucet/Shower | Clean or replace fixture |
| Leaky pipe | All faucets/appliances | Repair leaks |
| Sediment in water heater | Hot water only | Flush tank |
| Closed shut-off valve | Whole house | Open valve |
| Failing PRV | Whole house | Replace PRV |
| City supply issue | Whole house | Call city utility |
When to Call a Professional Plumber
If you’ve tried these steps and the problem still isn’t fixed, it’s time to bring in a pro. A licensed plumber can quickly diagnose the issue and provide long-lasting solutions without damaging your home.
Call 505 Plumbing, Heating & Cooling for Fast Help in Albuquerque, NM
At 505 Plumbing, Heating & Cooling, we specialize in solving low water pressure issues in Albuquerque homes. Whether it’s a clogged pipe, a bad pressure regulator, or an aging plumbing system, our licensed professionals will get your water flowing right again.
Call us today at (505) 560-3865 for a free estimate or to schedule same-day service.
