Low water pressure in a single fixture usually means a clogged aerator or a bad cartridge. Low water pressure at every fixture in the house is a different problem entirely — and there are exactly five things it can be. Working through them in order settles the diagnosis fast.
1. City Supply Problems
The first check is the cheapest: is it happening only to you, or to your whole street? Fort Worth Water crews do maintenance flushing on hydrants, particularly in summer, and pressure can drop measurably for a few hours. Check with a neighbor or the Fort Worth Water outage map. If pressure is low across multiple homes, the issue is upstream and will resolve on its own.
If it’s only your home, move to step two.
2. Main Shut-Off Valve Partially Closed
The main shut-off valve where water enters your home has to be all the way open for full pressure. Older gate-style valves sometimes get bumped or partially closed during unrelated repairs and never get fully reopened. Ball-valve types are easier to spot — the handle should be parallel to the pipe.
Also check any secondary shut-offs — sometimes at the water meter, and often at whole-home water filters if installed.
3. Failing or Miscalibrated PRV
Every Fort Worth home has a pressure reducing valve on the main line that drops incoming municipal pressure (which can run 90 to 110 psi) down to a safe residential level around 55 to 70 psi. When the diaphragm inside fails, the PRV can stick partially closed — giving the whole house low, weak pressure.
A pressure gauge on any exterior hose bib settles this in five minutes. Full-open reading below 40 psi almost always means the PRV is the problem.
4. Corroded or Scaled Supply Lines
If your Fort Worth home is more than 40 years old and still has galvanized steel supply lines, decades of interior corrosion have narrowed the pipes enough to restrict flow. Older copper lines in the same age range develop scale on the interior that reduces effective diameter the same way.
You can’t clean the interior of an installed supply line. If corroded pipe is the cause, the fix is repiping the affected sections — or, for widespread deterioration, whole-house repiping.
5. Hidden Leak on the Supply Side
A slab leak or underground supply-line leak between the meter and the home creates a constant pressure drop — water is escaping before it ever reaches your fixtures. Warning signs include unexplained increases in your water bill, damp spots in the yard, or warm patches on interior flooring.
To confirm: shut off every fixture in the house, then watch the water meter for 15 minutes. If the meter is turning at all with everything off, there’s a leak somewhere on your side of the meter.
The Order to Check In
Fastest path to a diagnosis:
- Ask a neighbor — rules out municipal supply issues
- Verify main shut-off is fully open
- Test pressure at an exterior hose bib with a $12 gauge
- Check the water meter with all fixtures off (rules out hidden leaks)
- If pressure is low with no leak, the cause is either PRV or corroded pipes
When Low Pressure Signals Something Bigger
Low pressure is annoying, but it’s rarely dangerous. The exception: a sudden drop in pressure paired with damp yard soil, cracks in a driveway, or foundation shifting could indicate a main-line break under the yard or slab. That’s an emergency-service call, not a diagnostic checklist.
For Pressure Diagnosis in Fort Worth
A licensed technician will identify the actual cause in a single visit, using pressure gauges, meter readings, and a visual inspection of the main and shut-offs. Most fixes are straightforward once the diagnosis is confirmed.
To schedule a low-pressure diagnosis in Fort Worth, call 817-438-6955 and a licensed technician will bring pressure test equipment on the first visit.
Ready to talk to a licensed plumber?
Call the Fort Worth dispatch line directly — a live dispatcher answers, not a voicemail tree.
