Few things are more frustrating than stepping into the shower, only to be met with a trickle of water instead of a strong stream. Low water pressure isn’t just annoying — it’s often a sign of an underlying plumbing problem that’s worth diagnosing before it gets worse. Here are the five most common causes.

1. Clogged Pipes or Fixtures

Mineral deposits, rust, and debris build up inside pipes, aerators, and showerheads over time, restricting flow. If the low pressure is limited to one faucet, start by cleaning or replacing the aerator. If it’s throughout the house, the clog is likely deeper in your plumbing and may call for professional drain cleaning or pipe work.

2. Hidden Leaks

A leak somewhere in your system diverts water before it reaches your faucet, dropping your pressure. Watch for unexplained high water bills, damp spots, or the sound of running water when everything is off. Hidden leaks waste water and cause damage, so they should be found and fixed quickly.

3. Corroded or Aging Pipes

In older homes, galvanized steel pipes corrode from the inside, gradually closing off the flow. If your home is several decades old and pressure has slowly declined over the years, corroded pipes are a likely cause — and whole-house repiping is often the permanent solution.

4. A Failing Pressure Regulator

Many homes have a pressure-reducing valve where the main line enters. When it fails, you may get a sudden drop (or spike) in pressure across the whole house. A plumber can test and replace the regulator to restore steady, safe pressure.

5. Water Main or Supply Line Issues

Sometimes the problem is outside your home — a leak, blockage, or break in the water line between the meter and your house. This can also show up as soggy spots in the yard or a jump in your water bill. Municipal work or a partially closed main shutoff valve can be culprits too.

When to Call a Professional

If cleaning your fixtures doesn’t solve it, or the low pressure affects your whole home, it’s time to bring in a licensed plumber. We use pressure testing and leak detection to pinpoint the real cause — no guesswork — and fix it right the first time.

Call Tri-State at 864-982-5232 for fast, honest service across Greenville and Upstate SC.