A running toilet is a common issue that can waste water and inflate your utility bill. Here’s how to fix it:

1. Turn off the water supply: locate the shut-off valve behind your toilet and turn it clockwise to stop water flow.

2. Check the flapper: remove the tank lid and inspect the flapper. If it’s worn or not sealing properly, replace it.

3. Adjust the chain: ensure the chain connecting the flapper to the handle has a bit of slack. Too tight or too loose can cause issues.

4. Test the flush: turn the water back on and flush to see if the issue is resolved.