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What Causes a Running Toilet?
A toilet that keeps running is usually caused by a worn flapper, an unbalanced float, a faulty fill valve, or a chain that is too short or too long. The good news is that most of these problems are inexpensive and easy to fix.
Step 1: Inspect the Flapper
Remove the tank lid and watch the flapper as you flush. If it does not seal tightly after the flush, water will continue to leak into the bowl. A cracked or warped flapper should be replaced.
Step 2: Check the Chain Length
If the chain is too short, the flapper can't close fully. If it's too long, it can get trapped under the flapper. Adjust the chain so there is just a little slack when the flapper is closed.
Step 3: Adjust the Float
If the float is set too high, water spills into the overflow tube and the toilet runs constantly. Lower the float by bending the float arm or adjusting the screw until the water stops below the overflow tube.
Step 4: Examine the Fill Valve
A worn fill valve may not shut off properly. If adjusting the float doesn't help, replacing the fill valve is a simple, affordable fix that usually solves persistent running.
Step 5: Test Your Repair
Flush the toilet and watch the tank refill. The water should stop at the marked fill line and the running sound should disappear. If everything looks good, your repair is complete.
Final Tips
Check your toilet for leaks every few months and replace worn parts early. A quick repair now can save thousands of gallons of water over the year.
