Toilet Repair in San Diego

A toilet has only a handful of working parts, and each one fails in its own recognizable way. A toilet that runs, one that leaks at the floor and one that flushes weakly are three different repairs, even when they show up in the same bathroom. Courtesy Plumbing handles toilet repair in San Diego homes on weekdays from 8 AM to 5 PM. Use the table below to match your symptom to the likely cause before you call. It helps us arrive with the right parts.

Match the Symptom to the Part

What you notice	Most likely cause	Usual repair
Runs constantly, or hisses	A flapper that no longer seals, or a fill valve that won’t shut off	New flapper or fill valve
Refills on its own every so often	Water seeping past the flapper until the tank tops itself up	New flapper, and a check of the flush valve seat
Water on the floor at the base	A failed wax seal, loose bolts, or a drip from the supply line or tank bolts above	Reset the toilet on a new seal, or replace the leaking connection
Rocks when you sit down	Loose or corroded bolts, or a damaged flange under the toilet	Secure it, or repair the flange and reset
Weak or incomplete flush	Low water level in the tank, a worn flapper closing early, or mineral scale in the rim openings	Adjust or replace tank parts, clear the scale
Handle sticks or does nothing	A broken handle arm, or a chain that slipped or snapped	New handle or chain

If the bowl fills and won’t go down, that’s a clog, not a repair. Drain clearing is handled by Drain Mob, the drain company we work with. If a toilet has already overflowed onto the floor, our toilet overflow cleanup page covers the drying side.

Two Checks You Can Do in Ten Minutes

The dye test. Add food coloring to the water in the tank, a few drops, and leave the handle alone. The EPA’s guidance is simple: if the color reaches the bowl within 10 minutes or so, the toilet is leaking. Flush afterward so the dye doesn’t stain.
The water level. Lift the tank lid and look at the overflow tube in the middle. If water is spilling into the top of that tube, the fill valve isn’t shutting off. If the level sits well below the mark on the tank wall, the flush will be weak.

A leaking flapper is easy to ignore because it’s quiet. The EPA says a worn flapper can silently leak thousands of gallons a year, and it suggests checking flappers regularly and replacing them at least every five years. The agency’s Fix a Leak Week guide shows the test.

Water at the Base: Find the Source First

Water on the floor around a toilet has four possible sources, and only one of them is the seal underneath. It can also drip from the supply line connection, from the bolts that hold the tank to the bowl, or from condensation running down a cold tank. We dry everything, flush, and watch where the first drop appears before we lift the toilet.

That order matters. One customer came to us for a second opinion after being quoted for a leaking pipe. The pipe was fine. The wax seal under the toilet had failed, and resetting the toilet on a new seal ended the leak.

A base leak on an upper floor shouldn’t wait. The water goes into the subfloor and the ceiling below long before it shows on the surface.

Old and Unusual Toilets

Most toilets take standard parts that we carry on the truck. Older and less common models are where a repair takes some skill. On one job, an old fill valve had a broken piece that was no longer sold on its own. Our plumber adapted a spare part to fit, and the toilet went back into service. Dual-flush toilets, one-piece models and pressure-assisted tanks each have their own parts, so tell us the brand if you know it. A photo of the inside of the tank is even better.

What a Repair Visit Looks Like

Tell us the symptom. The more exact, the better. When one customer described two running toilets by phone, our plumber brought parts for both and finished in under an hour.
We confirm the cause. A running toilet can be the flapper, the fill valve or the flush valve seat, and we check all three before replacing anything.
You get the price first. On a typical running toilet call, we diagnosed it, gave the cost before starting, and had it fixed in about 30 minutes.
We test it. Several flushes, a dry floor and a tank that goes quiet when it’s full.

While we’re there, we look at the stop valve and the supply line. A stiff valve or an old plastic supply nut is a small part that can cause a large leak.

When a Repair Stops Making Sense

Most toilets are worth repairing. A new flapper or fill valve costs far less than a new toilet, and the porcelain itself lasts for decades. Replacement becomes the better call in a few cases:

A crack in the tank or the bowl.
Parts that are no longer made, after a repair has already been improvised once.
The same toilet needing work again and again.
An old model that uses several gallons per flush, when today’s limit in California is 1.28.

When it’s a close call, we lay out both options with the cost of each and leave the choice to you. Our toilet installation page explains what to measure if you go with a new one.

For a toilet that runs, leaks or won’t flush right, call (858) 567-0544 between 8 AM and 5 PM, Monday to Friday. You can also send the symptom and a photo of the tank through our Contact Us form. Courtesy Plumbing carries California license CSLB #910268 and was started in 2007 by Tony Misleh, a master plumber.