How to Fix a Running Toilet and Stop Wasting Water

Check the Flapper for Leaks

A worn or misaligned flapper is one of the most common reasons toilets keep running. Over time, the rubber can deteriorate or warp, preventing a tight seal. To test the flapper, press down on it after the tank has filled. If the running stops, the flapper is the culprit. Replacing it is simple, you can buy a new one from any hardware store for just a few dollars. Shut off the water supply, drain the tank, and unhook the old flapper from the chain. Then, attach the new one and reconnect the chain to the flush lever. Once installed, turn the water back on and see if the problem is resolved.

Adjust the Float Level

If the flapper isn’t to blame, the issue might lie with the float mechanism. The float controls how much water fills the tank. When it’s set too high, water continues to flow into the overflow tube, causing the toilet to run constantly. To fix this, adjust the float so that the water level sits about an inch below the top of the overflow tube. For newer toilets with a float cup design, squeeze the metal clip and slide the float down the rod. For older ball-style floats, gently bend the metal arm downward to lower the water level. After the adjustment, flush and wait to see if the toilet stops running.

Inspect the Fill Valve

A malfunctioning fill valve can also keep your toilet running. Sediment buildup or worn-out internal seals can prevent the valve from shutting off properly. To test it, lift the float arm while the tank is filling. If the water stops, the valve is fine. If it continues to flow, the fill valve needs cleaning or replacement. Turn off the water supply, remove the valve cap, and rinse it to clear debris. If that doesn’t work, consider replacing the valve. Most fill valves are inexpensive and come with clear instructions for installation. If you’re unsure or the problem persists, contact a plumbing repair service to handle it safely and correctly.

Tighten or Replace the Chain

Sometimes, the issue is as simple as a chain that’s too long or too short. If the chain connecting the flush lever to the flapper is tangled or too tight, it can prevent the flapper from closing fully. On the other hand, if it’s too loose, the flapper may not lift enough to allow a full flush. Adjust the chain so it has a slight space when the flapper is closed. This small tweak often solves the problem without the need for any replacement parts or complex adjustments.

Know When to Call a Professional Plumber

While many running toilet issues are easy to fix on your own, there are times when the problem runs deeper. If you’ve replaced parts and adjusted the mechanisms but your toilet still runs, there could be a hidden leak, mineral buildup, or an internal crack in the tank. In these cases, calling a professional plumber in Orange is the best move. A licensed repair service can diagnose the issue accurately and provide lasting toilet repair solutions that prevent further water waste.

Need a Reliable Company?

Are you in need of a toilet repair? Luckily, we at Urgent Rooter have dedicated workers ready at your service. Contact our representatives for more questions.