Fix a Toilet That Keeps Running

The most common cause is a faulty flapper. Follow the path: free → cheap → advanced.

Free Fixes

1. Listen for leaks; if none, skip to next step.

$0 Fix

1. Check and adjust water level in tank (should be 1-2 inches below overflow tube).
2. Ensure flapper seals properly by gently pressing it with a pencil or pen.

$5-10 Fix

1. Replace the flapper if it's old or damaged. A new one costs about $6-8.

Pro tip: If the toilet still runs after replacing the flapper, consider a new fill valve; they often fail together.