Why Is My Water Pressure Low? Common Causes & What to Do
Low water pressure can make showers, faucets, and appliances frustrating to use. Sometimes the cause is simple, like a clogged aerator. Other times, it can point to a failing pressure regulator, corroded pipes, or a hidden leak.
At Steve Ray Plumbing, one of the first things we look at is whether the problem affects one fixture or the entire house. That distinction can quickly narrow down the cause.
Start With a Whole-House Check
Before replacing a showerhead or taking apart a faucet, test several fixtures around your home. Turn on the kitchen faucet, bathroom sink, and shower. Then compare hot and cold water. If only one fixture has weak flow, the issue is usually localized. If several fixtures have low pressure, the problem may be farther back in the plumbing system.
Common Causes of Low Water Pressure
Clogged Aerators or Showerheads
Mineral scale and sediment can block the small openings in faucet aerators and showerheads. If only one fixture is affected, cleaning or replacing the aerator is a good place to start.
Worn or Clogged Cartridges
We often see isolated low-pressure problems caused by buildup inside faucet or shower cartridges. In one common type of service call, a homeowner notices that a shower has gradually become weaker while the rest of the house has normal pressure. Mineral buildup inside the mixing cartridge can restrict flow. Replacing the cartridge and flushing the line can restore normal water flow.
Partially Closed or Failing Valves
A main shut-off valve that is not fully open can reduce water flow throughout the house.
Be careful with older, corroded valves. Forcing a stuck valve can damage it and create a much larger plumbing problem.
A Failing Pressure Regulator
Some homes have a pressure-reducing valve, or PRV, that controls incoming water pressure.
When a PRV begins to fail, homeowners may notice weak or fluctuating pressure throughout the house. Replacing fixtures will not solve this type of problem.
Corroded or Restricted Pipes
Mineral buildup and corrosion can gradually narrow the inside of older pipes. This is why low pressure should not automatically be dismissed as "normal" in an older home. A gradual decline in pressure can be a sign that the plumbing system needs attention.
Hidden Leaks
A leak can reduce pressure because water is escaping before it reaches your fixtures.
Watch for signs like:
Higher-than-normal water bills
Damp areas in a basement or crawlspace
Pooling or unusually wet areas in the yard
Water stains
Running-water sounds when all fixtures are turned off
A sudden drop in pressure combined with signs of a leak should be addressed quickly.
Water Heater Problems
If cold-water pressure is normal but hot-water pressure is weak, the issue may be related to the water heater or hot-water piping. Sediment buildup, valves, or other restrictions can reduce hot-water flow.
Municipal Water Issues
Sometimes the problem is outside your home. Maintenance or repairs by City Water, Light and Power can temporarily affect water pressure in Springfield. If neighbors are experiencing the same issue, the pressure drop may be related to the municipal supply rather than your plumbing.
Can Summer Affect Water Pressure?
Summer can make pressure changes more noticeable because of increased water use for lawns, gardens, outdoor faucets, and other activities.
However, persistent low pressure should not simply be blamed on seasonal demand. If the problem continues, there may be an underlying plumbing issue.
When Can You Fix Low Water Pressure Yourself?
If the problem affects only one faucet, checking the aerator for mineral buildup is a reasonable first step.
We do not recommend repeatedly replacing fixtures without figuring out where the restriction is coming from.
A weak shower does not always mean you need a new showerhead. The real issue could be a clogged cartridge, failing valve, pressure regulator, or restricted pipe.
Use caution with stuck cartridges and old valves as well. Forcing heavily corroded plumbing parts can turn a simple repair into a much larger one.
When Should You Call a Plumber?
Consider calling a plumber if:
Low pressure affects the whole house.
The pressure dropped suddenly.
Only the hot-water pressure is weak.
Pressure fluctuates frequently.
You suspect a leak.
You hear water running when fixtures are off.
Cleaning a fixture does not restore normal flow.
The most important first step is figuring out whether the issue is isolated or widespread.
Low water pressure is a symptom, not just an inconvenience. Finding the cause early can help prevent wasted money, unnecessary repairs, and potentially more serious plumbing damage.
Steve Ray Plumbing helps homeowners throughout Springfield, Illinois, diagnose and repair low water pressure problems. If you are not sure what is causing the issue, our team can inspect the system and recommend the right repair.
