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Repair guide · Easy · 10 to 20 minutes

How to Fix a Running Toilet

A running toilet wastes up to 200 gallons a day and usually needs a $10 to $25 part you can install yourself. Here is the honest version of how to fix it, and the signs it is time to hand it to us.

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How to Fix a Running Toilet

What You Need

Know These Parts Before You Start

Inside the tank, top view
Inside the tank, top view
The flapper, at the bottom of the tank
The flapper, at the bottom of the tank
The supply shutoff, behind the toilet
The supply shutoff, behind the toilet

The Fix, Step by Step

  1. Confirm the culprit

    Put a few drops of food coloring in the tank. If color reaches the bowl within 15 minutes without flushing, the flapper is leaking. That is the cause in most running toilets.

  2. Swap the flapper

    Turn off the supply valve behind the toilet, flush to empty the tank, unhook the old flapper from the pegs and chain, and clip on the new one. San Diego's hard water stiffens flappers early, so do not be surprised if yours is warped at only a few years old.

  3. Check the fill valve

    If water keeps trickling into the overflow tube, adjust the float so the water line sits about an inch below the tube's top. If the valve hisses or will not shut off, replace the fill valve. Kits include instructions and take about 15 minutes.

  4. Set the chain

    Leave just a little slack. Too tight holds the flapper open, too loose will not lift it. Flush twice and watch a full cycle before you call it done.

Stop and call us if: the shutoff valve behind the toilet will not turn or is corroded, water is on the floor, the tank is cracked, or the toilet still runs after a new flapper and fill valve. Those point to problems a part swap will not fix, and forcing a seized valve can turn a drip into a flood.

Tried it and it's still running?

Call and describe it. We will tell you what it likely is, what it usually involves, and how soon we can be there.

Related Guides & Services

What Customers Say About Paws Plumbing

Verified Google reviews from San Diego homeowners.

ThistlefinchPosted on Google
Five stars

"Plumbing issues are always stressful. Jonathan and Billy replaced our shower valve and made light work of it. What a pleasant experience opening our home to them."

Nicholas BrunoPosted on Google
Five stars

"I've used Paws for multiple things in the condo, from kitchen problems to two toilet installations. By far one of the most honest and up front companies I've used, and the only people I will use for all things plumbing related."

Dominique O'BrienPosted on Google
Five stars

"I love these guys. They always go the extra mile to make sure the repairs are done right but also quickly."

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