Licensed & Insured · CA LIC #982663
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Pacifica, San Francisco, Burlingame, CA · Serving the Bay
PACIFICA, CA • LIC #982663 • 24/7
We answer the phone day, night, weekends, and holidays, with same-day service across the Peninsula.
A toilet that runs, rocks, or leaks is easy to ignore until the water bill or the floor makes it urgent. Works Plumbing provides toilet repair in San Mateo, CA, fixing the part that failed and checking the conditions that wore it out.
Upfront pricing. Same-day service. No obligation.
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Contact Works Plumbing to schedule toilet repair. Same-day service is available, with upfront pricing before we start.
Key Takeaways
These are the most common toilet calls we take in San Mateo:
Each one has a short list of likely causes. We test before we replace anything.
We at Works Plumbing repair the toilet you have whenever it makes sense. If a repair costs close to a replacement, we tell you so you can choose.
A running toilet has a short list of suspects. We check them in order, so you pay for the part that failed and not for guesses.
A dye test in the tank shows whether water is leaking into the bowl. That helps us confirm whether the flapper is the problem.
The shutoff valve behind the toilet is easy to forget until you need it. Census data puts the median year built for San Mateo housing at 1965, so many shutoff valves have been in place a long time.
On every toilet repair, we check that the shutoff closes fully and that the supply line is in good condition. If the valve will not close or the line shows wear, we tell you and quote the replacement. A working shutoff lets you stop a leak quickly.
Water at the base can be a failed wax seal, a cracked bowl, a loose supply line, or condensation on the tank. We find out which before pulling the toilet.
If the seal has failed, we reset the toilet with a new seal and check the flange. A soft floor around the base can mean water has been leaking for a while. If you see staining or a soft spot, our leak detection in San Mateo service can check the subfloor area.
A toilet that clogs alone is a toilet problem. A toilet that backs up while a tub or shower drains slowly is a different story.
In San Mateo, the property owner maintains the private sewer lateral from the building to the City main. A blockage there can affect fixtures throughout the house. If we see signs of a main line clog, we tell you and recommend drain cleaning in San Mateo before any toilet parts are replaced.
| What we find | What we usually recommend |
|---|---|
| Worn flapper or fill valve | Replace the part |
| Failed wax seal | Reset with a new seal |
| Leaking supply line or shutoff | Replace the line or valve |
| Cracked tank or bowl | Replace the toilet |
| Repeated clogs, older low-flow design | Discuss repair or replacement |
If a toilet needs to be replaced, the City’s permit language covers the replacement of plumbing fixtures. We confirm requirements with the City of San Mateo Building Division before that work starts.
Works Plumbing has been family owned and operated since 2009. We repair toilets across San Mateo, including Sunnybrae, Parkside, San Mateo Village, and North Central.
See all of our plumbing repair services, or visit the San Mateo plumbing services page.
Why does my San Mateo toilet keep running after the fill valve was replaced?
The cause may be the flapper, the flush valve seat, or the water pressure. San Mateo has 18 pressure zones in Cal Water’s system, so pressure varies by location. We measure it at your home before replacing more parts.
Is water pressure the same everywhere in San Mateo?
No. Cal Water’s Mid-Peninsula system runs 18 pressure zones in San Mateo alone. Part of the city is served by the Estero Municipal Improvement District instead, which is a separate supplier.
Do I need a permit to repair a toilet in San Mateo?
San Mateo’s permit language covers the installation, removal, alteration, or replacement of plumbing fixtures. For a repair that becomes a replacement, we confirm requirements with the Building Division before work starts.
My toilet and shower back up at the same time. Is that the City’s problem?
Usually not. San Mateo property owners maintain their private sewer lateral from the building to the City main. A backup that affects several fixtures can point to that line.
Where does San Mateo’s water come from?
Cal Water’s San Mateo System buys all of its water from the San Francisco Public Utilities Commission, according to its 2025 report. The water is treated with chloramine and rated soft on average.
Do you repair toilets in San Mateo condos and apartments?
Yes. Census data shows 16.7 percent of San Mateo housing units are in buildings of 50 or more units. We coordinate access with the building manager when the shutoff or supply is shared.
A running toilet wastes water every hour it runs. Book toilet repair in San Mateo and we will fix it, check the pressure, and explain what we found.
Weak and incomplete flushing are often symptoms of rust, debris, and mineral buildup within the rim feed and jet holes of your toilet bowl that are restricting and blocking water flow. If your toilet is unable to complete flushes well, call us right away to schedule an expert inspection and repair.
Every job comes with upfront pricing, licensed and background-checked technicians, and a 100% satisfaction guarantee . No surprises, no pressure, ever.
Snap a photo of the problem before you call, it helps us bring the right parts on the first visit.
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.
A look at real Works jobs around the Peninsula.
Most San Mateo homes get water from California Water Service. The Bay Area Water Supply and Conservation Agency profile of Cal Water’s Mid-Peninsula system describes the network that serves San Mateo and San Carlos. It covers 17 square miles with 363 miles of main. Within San Mateo, the system runs 18 separate pressure zones, and San Carlos has 22 more. All of the water comes from the San Francisco Regional Water System, with no local wells.
Eighteen zones inside one city tells you something useful: water pressure in San Mateo is not a single citywide number. A home across town may see a different reading at the tap than yours.
That matters on a toilet call. The fill valve is the part that shuts the water off when the tank is full. When a toilet hisses, refills on its own, or runs after a fill valve was already replaced, we do not assume. We read the static pressure at your home and tell you the number.
If the reading is high, we explain what that means for your fixtures and whether your pressure regulator, if you have one, should be checked. If it is normal, we look elsewhere, starting with the flapper, the flush valve seat, and the refill tube. Either way, you know why the part failed, not just that it did.
We also serve these neighboring Peninsula towns.
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.”
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Drain cleared or it’s free. Limit one per household.rnrn
Mention this offer when you schedule EXPIRES 12/31/2026Save $500 on a new tankless water heater install.rnrn
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