Why Your Water Pressure Is Low and How to Fix It
Low water pressure can turn a relaxing shower into a frustration. When water trickles from your showerhead or your washing machine fills slowly, something is restricting water flow. The good news is that low water pressure is usually fixable, and understanding the cause helps you solve it.
In Maryland homes throughout Gaithersburg, Frederick, and Woodbine, low water pressure stems from several common causes. Mallick Plumbing & Heating helps homeowners diagnose and fix pressure problems quickly, from simple fixes you can do yourself to professional repairs that require a plumber’s expertise.
Check for Problems at Your City Water Connection
Before assuming your home’s plumbing is the problem, check whether low pressure is coming from your city water supply. If pressure is low throughout your entire home—all faucets, showers, and outdoor spigots—the issue might be at the street.
Call your local water department and ask about pressure in your area. Water main breaks or repairs upstream sometimes reduce pressure for multiple homes. If the city confirms normal pressure, the problem is in your house or the line from the street to your home.
Test Water Pressure with a Gauge
Normal household water pressure is 40 to 60 pounds per square inch (PSI). You can test your pressure using an inexpensive pressure gauge ($10 to $20 at any hardware store). Screw the gauge onto an outdoor spigot or a laundry faucet and read the pressure.
If pressure is below 40 PSI, you have a legitimate low pressure issue that needs fixing. If it’s above 60 PSI, you might feel like pressure is weak even though it’s normal—the issue could be with your expectations or how fixtures are designed.
Check the Main Water Shutoff Valve
The main shutoff valve controls water flow into your entire home. Over time, these valves get stuck partially closed. If your shutoff valve is not fully open, water flow is restricted throughout your house.
Find your main shutoff valve (usually near where the water line enters your basement or crawl space) and make sure it’s fully open. Turn the handle counterclockwise if it’s a gate valve, or check that the handle on a ball valve is aligned with the pipe. Even a quarter turn toward closed reduces pressure significantly.
Clear Aerator Screen Filters
Aerators are small screens at the end of faucets that mix air with water. They catch sediment and debris, but they can get clogged. If only one or two faucets have low pressure, a clogged aerator is likely the culprit.
Unscrew the aerator from the faucet tip, rinse it clean, and screw it back on. If it’s heavily clogged with sediment or mineral buildup, soak it in white vinegar for an hour to dissolve deposits. This simple fix often restores good pressure to problem faucets.
Look for Visible Leaks
Hidden leaks reduce water pressure throughout your home. Water is escaping through cracks or failed connections instead of reaching your taps. Look for wet spots in your basement or crawl space, water stains on ceilings, or soft spots on walls.
Check water meter readings before and after periods when nobody uses water (like at night). If the meter changes without water being used, you have a hidden leak. We use leak detection equipment to find leaks before they cause major damage.
Sediment and Mineral Buildup in Pipes
In older Maryland homes, sediment and mineral deposits accumulate inside water lines over decades. Rust from corroding galvanized pipes, mineral deposits from hard water, and debris narrow pipe interiors. Water has less space to flow, so pressure drops.
This is especially common in homes with original galvanized steel piping installed 40 to 50 years ago. If your home is older and pressure has been declining gradually, internal pipe corrosion is probably the cause. Eventually, these old pipes need replacement with modern copper or PEX.
Check Your Water Pressure Regulator
Many homes have a water pressure regulator on the incoming main line. This device lowers pressure to safe levels for your home. If the regulator fails, it can either fail closed (restricting flow) or fail open (causing high pressure).
A pressure gauge test shows whether the regulator is working. If pressure is low and the shutoff valve is open, the regulator might be stuck. We can test and replace a faulty regulator to restore normal pressure.
Consider Your Water Heater
A failing water heater sometimes causes low hot water pressure. Sediment buildup inside the heater restricts outflow of hot water. Cold water pressure might be fine, but hot water pressure is weak. Flushing the water heater solves this problem.
If hot water pressure never improves after flushing, the heater itself might be failing. We can assess your water heater and recommend whether flushing or replacement makes sense.
Freezing or Burst Pipes
During cold Maryland winters, water in exposed pipes can freeze and block flow. You’ll notice pressure drops in certain lines. If a pipe bursts, pressure might drop everywhere downstream from the break.
If you suspect frozen pipes, insulate them and allow them to thaw gradually. Never use heat sources like blowtorches. If pressure doesn’t return after thawing, a burst pipe might exist. We find and repair burst pipes quickly.
When to Call a Professional Plumber
Try the simple fixes first—check shutoff valves, clean aerators, and test pressure. If none of these work, call Mallick Plumbing & Heating. We have tools to find leaks, test regulators, and diagnose pressure problems accurately. If your home has old galvanized pipes, we can discuss replacement options.
Frequently Asked Questions
What water pressure is considered low?
Below 40 PSI is low. Normal household pressure is 40 to 60 PSI. Above 80 PSI is high pressure that can damage fixtures. Most people are comfortable with 50 to 60 PSI.
Can low water pressure damage my plumbing?
Low pressure itself doesn’t damage plumbing, but the underlying cause might. For example, a hidden leak will eventually cause water damage. A clogged main line might lead to pipe failure. Address the root cause rather than just accepting low pressure.
How much does it cost to fix low water pressure?
Simple fixes like cleaning aerators are free. Replacing a pressure regulator costs $200 to $400. Finding and repairing leaks depends on location—$300 to $1,000. Pipe replacement is more expensive but necessary for old corroded lines.
Get Your Water Pressure Back to Normal
Low water pressure is annoying but usually fixable. Start with simple checks yourself, then call Mallick Plumbing & Heating if the problem persists. We serve Gaithersburg, Frederick, and Woodbine homeowners with water pressure diagnosis and repair. Don’t accept weak water pressure—let us find the cause and fix it.
Last Updated: March 18, 2026