The short answer
Check the Obvious First
Start by testing every faucet and fixture in your home. If only one sink or shower has low pressure, the aerator or showerhead is likely clogged with mineral deposits. Unscrew it, soak it in vinegar for an hour, and scrub it clean. That fixes many sudden drops without any tools.
If all fixtures are weak, check the main shutoff valve near your water meter. A partially closed valve, perhaps bumped during recent work, can reduce pressure throughout the house. Turn it fully counterclockwise, then test again. Also check any shutoff valves under sinks or behind toilets.
Knowing where your shutoff valve is located helps you act quickly if a leak appears. Keep that location written down near the meter or in a visible spot.
Look for Leaks and Water Damage
A hidden leak in your pipes can siphon pressure and cause sudden drops. Look for damp spots on ceilings, walls, or floors, especially near bathrooms and the water heater. Listen for hissing sounds or the sound of running water when everything is off.
Check your water meter. If the dial moves when no water is being used, you likely have a leak. That leak can lead to water damage in walls, floors, or the crawlspace. If you find damage, local water damage pros can extract water and dry out affected areas.
If you find damage, the pros can extract water and dry out affected areas. Policies vary, and your insurer decides what is covered. Check your policy to see if water damage from a sudden leak is included.
- Damp spots on drywall or ceilings
- Warped or buckling flooring
- Musty odor in a room or crawlspace
- Unexplained increase in your water bill
- Puddles near the water heater or under sinks
Inspect the Water Heater and Pipes
If your hot water pressure is low but cold water is fine, the issue is often your water heater. Sediment buildup at the bottom can restrict flow. A plumber can flush the tank to remove sediment. Also check the shutoff valve on the cold water inlet to the heater.
Corroded or partially closed valves on the heater can also cause pressure loss. If you see rust or moisture around the heater, that's a sign of a leak. Turn off the water supply to the heater and call a plumber. Do not attempt repairs on gas or electric heaters yourself.
In cold climates, frozen pipes can also cause sudden low pressure. If you suspect freezing, open a faucet slightly to relieve pressure and warm the area with a space heater, never an open flame.
Consider Municipal Water Supply Issues
Sometimes the problem is outside your home. The city might be doing maintenance or a fire hydrant nearby could be in use. Check with your neighbors. If they also have low pressure, it's likely a supply issue, not your plumbing.
You can also check your main shutoff valve outside, but be careful. If the valve is stuck or the meter is damaged, call your water utility. Do not attempt to dig or repair the line yourself, as that could cause a major leak and water damage to your yard and foundation.
When to Call a Plumber
If you've checked the obvious and still have low pressure, or if you find a leak, call a plumber. They can test pressure, locate hidden leaks, and inspect your pipes for corrosion or blockages. A plumber can also advise on whether you need a pressure regulator or new piping.
If you discover water damage from a leak, the pros can handle extraction, drying, and repairs. They can also help with mold prevention in damp areas like crawlspaces. Act quickly to minimize damage and avoid health risks.
See a doctor if you feel unwell due to mold exposure or other contaminants.
- Leak detection equipment
- Pipe inspection with cameras
- Pressure testing
- Water heater flushing
- Shutoff valve replacement
Talk to someone now
Phones are answered 24/7 for Quincy and nearby communities.
Call Now (617) 404-2753Frequently asked questions
Why is my water pressure low in only one faucet?
A clogged aerator or showerhead is the most common cause. Mineral deposits build up over time and restrict flow. Remove the aerator, soak it in vinegar, and clean it. If that doesn't help, the supply line to that fixture might be kinked or partially shut.
Can a water leak cause low pressure?
Yes, a leak in your pipes can reduce pressure because water escapes before reaching your fixtures. Look for damp spots, listen for running water, and check the water meter. If you find a leak, turn off the water and call a plumber. Water damage pros can handle cleanup if needed.
Should I worry about low pressure from my water heater?
If only hot water is affected, sediment in the tank is often the culprit. A plumber can flush the tank. Also check the shutoff valve on the cold water inlet. If you see leaks or rust, turn off the water and call a plumber immediately to prevent water damage.