Leak detection in San Francisco, CA starts when something tells you water is going somewhere it should not. That might be an SFPUC leak alert, a stain on the garage ceiling, or a bill that keeps rising. Works Plumbing finds the source with acoustic, thermal, and pressure testing, then explains the repair before any wall is opened.
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Hidden leaks rarely show up where they start. Watch for:
A leak alert from SFPUC
A water bill higher than your normal use explains
A meter that keeps moving with every fixture off
Stains, bubbling paint, or soft drywall
A musty smell or mildew in one room or closet
The sound of running water when nothing is on
One sign is reason enough to look. Two or more usually means the leak has been running for a while.
How We Find Hidden Leaks
We use three main methods, alone or together:
Acoustic listening. Pressurized water escaping a pipe makes a sound. Sensitive microphones help us trace it through floors and walls.
Thermal imaging. Hot water leaks, and the cooling caused by wet materials, show as temperature differences on a thermal camera.
Pressure testing. We isolate sections of piping and watch for pressure loss to confirm which run is leaking.
The goal is the smallest possible opening. We mark the leak before cutting so the repair goes where the problem is.
Where Leaks Hide in San Francisco Homes
Leaks follow the pipes, and the pipes follow the house. Common hiding places include:
Inside walls behind showers, tubs, and kitchen sinks
Under floors where supply lines cross to a bathroom
In the ceiling below an upstairs bathroom
The service line between the meter and the house
Irrigation lines in front or rear gardens
Many Sunset District houses have living space above a ground-level garage, according to SF Planning’s history of the area. In homes built that way, a leak upstairs often shows first as a stain or drip in the garage ceiling.
Leak Detection in San Francisco, CA: Our Process
Every leak search follows the same order:
Review the evidence. Alerts, bills, stains, and when the problem started.
Check the meter. We confirm flow with all fixtures off.
Rule out fixtures. We test toilets, faucets, and valves first.
Isolate the piping. We separate branches to narrow the search.
Pinpoint. Acoustic, thermal, and pressure tools locate the leak.
Explain the repair. You get the location, the cause, and an upfront repair price.
After We Find the Leak
Finding the leak is half the job. What comes next depends on where it is.
A running toilet is often a quick part replacement, and our toilet repair in San Francisco handles flappers, fill valves, and base leaks. A leak in the line from the meter to the house is the owner’s pipe, and our water line repair in San Francisco covers repair or replacement of that service line.
Leaks inside walls or under floors are repaired at the marked spot, with the opening kept as small as the repair allows.
Why San Francisco Homeowners Choose Works Plumbing
Family-owned and operated since 2009
Licensed and insured (CSLB #982663)
Acoustic, thermal, and pressure testing
Upfront pricing and free estimates
Same-day service and 24/7 emergency help for active leaks
Financing available on larger repairs
We find leaks for homeowners across San Francisco, from Parkside and the Outer Sunset to the homes around Stonestown. Learn more about our leak detection services.
Leak Detection in San Francisco: FAQs
I got an SFPUC leak alert. What should I do first?
Turn off every fixture and check whether your meter is still moving. Check toilets and irrigation first, since they are common causes of continuous flow. If the meter still moves and you cannot find the source, book a leak detection visit.
Why did SFPUC send me a leak alert?
For small residential accounts with meters that transmit electronically, SFPUC sends an alert after 48 hours of continuous use at 7.5 gallons an hour or more. It means water ran without stopping, not where the leak is.
Can SFPUC find the leak for me?
If you cannot find the leak, SFPUC offers a Water-Wise Evaluation. For a hidden leak inside walls, floors, or buried lines, we use acoustic, thermal, and pressure testing to pinpoint it.
Will I get a credit on my San Francisco water bill?
SFPUC says a leak allowance credit may follow a repair. SFPUC decides eligibility. Keep your alert notice and the repair invoice together for the application.
Do you have to open walls to find a leak?
Not to find it. Our tools locate most leaks without cutting. Once the leak is marked, the repair opening is kept as small as the repair allows.
Do you offer same-day leak detection in San Francisco?
Yes. We offer same-day service, and 24/7 emergency response when water is actively coming through a ceiling or wall.
Book Leak Detection in San Francisco
If an alert, a bill, or a stain says water is escaping, Works Plumbing will find where it is going and explain the fix.
Professional Leak Detection Company in San Francisco
Water leaks can be a tricky thing, which is why you need to choose a professional leak detection company in San Francisco that has the necessary experience to get to the bottom of things quickly. Named the best plumbers in San Francisco by Expertise.com, Works Plumbing has been offering excellent leak inspection services to the area for over a decade. Our fully licensed and insured plumbers know how devastating a leak can be to a home, which is why our team will go the extra mile to perform confident leak detection services to ensure your home remains safe and dry. We provide everything from leak inspection to leak repair and will see the job through to the end because as your neighbor we care about the state of your home. If you suspect that you need a leak inspection in San Francisco, call Works Plumbing today. We offer 24/7 emergency services and are ready to address your situation right away!
What’s included
Review of alerts, bills and stains
Meter check with all fixtures off
Toilet, faucet and valve testing
Acoustic and thermal leak location
Pressure testing of isolated piping
Marked leak location and upfront repair price
How the job goes
We review your alert or bill and confirm flow at the meter with fixtures off.
We rule out fixtures, isolate the piping and pinpoint the leak with our tools.
We mark the leak, explain the cause and give you an upfront repair price.
Our crew on a recent job across the Peninsula.
Professional Leak Detection Company in San Francisco
Works Plumbing is family-owned since 2009, licensed and insured, and uses acoustic, thermal and pressure testing to find leaks without guesswork. We price the repair upfront and keep any opening small.
Pro tip
If an SFPUC leak alert arrives, check toilets first. Add a few drops of food coloring to the tank and wait without flushing. Color in the bowl means a leaking flapper, a common cause of continuous use.
See how we handle it:
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Upfront pricing, licensed techs, and a real human on the phone 24/7 across the Peninsula.
San Francisco gives many owners an early warning. Under the SFPUC Leak Alert Program, the utility reviews hourly use for meters that transmit electronically. Small residential and irrigation accounts get an alert after 48 hours of continuous water use at 7.5 gallons an hour or more.
The program can send up to three rounds of alerts over 10 weeks. If you cannot find the leak, a Water-Wise Evaluation is available. After a repair, a leak allowance credit may follow.
Here is the mechanism behind the alert. A normal home uses water in bursts, then the meter rests. When the meter never rests for two days, something never shuts off:
A toilet flapper that leaks into the bowl
A dripping faucet or a valve that will not close
An irrigation line or valve stuck open
A supply pipe leaking inside a wall, under a floor, or in the yard
The alert proves water is flowing. It does not say where.
That is where we at Works Plumbing start. We read the meter with every fixture off, then isolate fixtures and branches one at a time. When the obvious causes are ruled out, we move to acoustic, thermal, and pressure tools to pinpoint a hidden leak. Keep your alert notice and our repair invoice together, since a leak allowance credit may follow the repair.
We’ve earned our reputation one happy homeowner at a time.
“Thank you again for another job well done, and thank you for responding right away. I will continue to recommend Works Plumbing because they respond right away and get the job done efficiently.”
DK
David K.
San Mateo Google Review
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