What Is Your Pressure Doing?
Tap what you notice.
Low Water Pressure Problems
Suddenly low pressure usually has a short list of causes: a partly closed valve, a failing regulator, a hidden leak, corroded pipe or a supply event. Reddit threads from UTSA-area homeowners show how often neighbors share the same drop, which points to SAWS.
- Closed or partly closed main or meter valve
- Failing pressure regulator
- Hidden leak (do the meter test)
- Clogged aerators, cartridges or filters
- Corroded galvanized pipe
- Street work or system repairs
High Water Pressure and Fixture Damage
Pressure above about 80 psi can stress hoses, valves, water heaters and appliances, and can cause leaks and banging. One SAWS customer measured 105 psi at home after a high bill, which is a typical wake-up call.
Residential Pressure Testing
- Attach a gaugeA gauge on an outdoor faucet gives a static reading.
- Test under flowOpen fixtures to see how much pressure drops.
- Check regulator and valvesCompare readings before and after the regulator.
- Look for leaksMeter test, then targeted leak detection if needed.
Water Hammer and Noisy Pipes
Banging comes from fast-closing valves and high pressure. Solutions include correcting pressure, adding arrestors and checking thermal expansion control near the water heater.
Water Pressure Repair Options
| Cause | Fix |
|---|---|
| Failed regulator | Replace the regulator |
| Hidden leak | Locate and repair |
| Corroded pipe | Repair or repipe sections |
| Weak supply | Booster pump, after testing |
Seasonal Pressure Issues
Spring
Spring irrigation start-up can expose leaks and pressure swings.
Summer
Summer demand can lower street pressure.
Fall
Check regulators and valves before winter.
Winter
Cold snaps can strain pipes and expansion control.
Checklists
Before we arrive
· Tip: screenshot this list.
Ask any plumber
· Tip: screenshot this list.
Why You Should Not DIY Pressure Adjustments
- Do not open the meter box beyond viewing.
- Do not dig around the meter or regulator.
- Random adjustment can damage fixtures and appliances.
Myths vs. Facts
| Myth | Fact |
|---|---|
| Higher pressure is better. | Over about 80 psi can damage plumbing. |
| Low pressure is always the utility. | Often it is your regulator, a leak or a closed valve. |
| Pipes bang because they are old. | Often pressure or fast valves. |
Our Estimate Process and What to Expect
- Call or text a photoTell us what you see. We tell you honestly whether it needs a visit and how urgent it is.
- Inspect and testA licensed plumber checks water pressure repair and explains findings in plain language.
- Written estimateScope, materials, permits and exclusions in writing. No work starts without it.
- You approveYou choose. We never start before you say yes.
- Work, test, clean upWe finish, test, clean up and walk you through what changed.
Ask for our license number and verify it at tsbpe.texas.gov. Getting two or three written quotes is smart. Compare scope line by line, not just the total.
Water Pressure Repair FAQs for San Antonio Homeowners
Why is my water pressure suddenly low?
Check the main valve, ask neighbors, and do a meter test for leaks. If neighbors are affected, call SAWS. If only your home, call a plumber.
Can high water pressure cause leaks?
Yes. Pressure above about 80 psi can stress pipes, fixtures and appliances.
Why do pipes bang after closing a faucet?
Usually water hammer from fast valve closure, often made worse by high pressure.
What is a normal water pressure?
Many homes aim for roughly 50 to 60 psi. SAWS recommends staying under 80 psi.
Who do I call: SAWS or a plumber?
Call SAWS for street-wide issues. Call a plumber if only your home is affected.
How much does repair cost?
It depends on the cause. A diagnosis comes first, then a written estimate.
About This Page and Our Sources
- San Antonio Water System — service, pressure, backflow program, 210-704-SAWS (7297)
- Texas State Board of Plumbing Examiners — verify any plumber’s license
- U.S. EPA: Drinking Water — general drinking water information
Pressure data comes from SAWS public pages. Confirm specifics with SAWS. Costs and requirements vary by property. Nothing here replaces an on-site inspection by a licensed plumber. Stark is not affiliated with SAWS, CPS Energy or any manufacturer named here.
