Toilet Running Constantly | Carmel-by-the-Sea Plumbing

A toilet that runs or won't stop filling is usually caused by a worn-out fill valve or a faulty flapper at the bottom of the tank. Both are small parts you can often replace yourself, or a plumber can fix it in minutes.

Do this right now

Check if the flapper is stuck

Lift the toilet tank lid and set it on a towel on the floor. Look at the rubber flapper at the bottom of the tank. If it looks warped, stuck, or cracked, gently jiggle it with your finger. Sometimes sediment gets caught under it and prevents a seal.

Listen for water running into the overflow tube

While the toilet is running, look in the tank. If water is trickling into the small tube in the center of the tank, the fill valve is not shutting off. If water is leaking past the flapper at the bottom, the flapper is the problem. You found the culprit.

Try a quick fix with the float

The float is a plastic or metal arm that rises with water and should shut off the fill valve. If it's too low or stuck, gently bend it up (or adjust the clip on newer models). The fill valve should stop when the water reaches the line marked on the tank. If the water level climbs past it, the valve is failing.

If it keeps running after 20 minutes, call us

A persistently running toilet means a part is worn and needs replacing. The fill valve or flapper costs little and takes a plumber 15 minutes to swap out. Water waste is expensive, so don't wait.

Toilet fill valves and flappers wear out over time, especially in homes with hard water or sediment in the supply line. Carmel's coastal water can carry minerals and occasional sediment, and these particles collect in the valve and keep it from sealing tight. A running toilet is loud and maddening, but the bigger cost is wasted water. A single running toilet can waste 200 gallons a day.

A plumber inspects the tank to diagnose which part is failing. The flapper is a rubber seal at the bottom of the tank that controls water flow from the tank into the bowl. The fill valve is at the top of the tank and stops the water from refilling once the tank is full. Either one can wear out and cause a constant trickle or stream.

Replacing a fill valve or flapper is a simple repair. Both parts are inexpensive and available at any hardware store. A plumber can have you fixed in one visit. If you tried adjusting the float and the running continued, the valve is worn and replacement is the next step.

Common questions

Is a running toilet a plumbing emergency?

It's not an emergency in the sense that your home is in danger, but it is urgent because of water waste. A running toilet for even one week wastes hundreds of gallons and drives up your water bill. Fix it as soon as you notice it.

Why does sediment cause toilet problems in Carmel?

Coastal water delivery systems sometimes have sediment from aging pipes or from water treatment. When sediment reaches your home, particles get stuck in the small openings of the fill valve and flapper, preventing them from sealing. A plumber may recommend a whole-home water filter if sediment is a recurring issue.

Can I replace the flapper myself?

Yes. Turn off the water at the shut-off valve behind the toilet, flush to empty the tank, and unclip the old flapper from the fill valve. The new one clips on the same way. It takes 5 minutes and costs a few dollars. If you're unsure, a plumber can do it in your first call.

Still not sure?

Describe what you're seeing to a real Carmel-by-the-Sea plumber: call (831) 555-0182 or send the form. Free, no obligation.

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Toilet running constantly or not stopping: fix it yourself