My toilet keeps running after I flush. How do I fix this?

A running toilet is usually caused by a faulty flapper, chain adjustment issue, or water level problem - most of these are simple DIY fixes that can save you from wasting hundreds of gallons of water per day.

Start by checking the flapper at the bottom of the toilet tank. Remove the toilet tank lid and look inside - the rubber flapper should create a tight seal over the flush valve opening. If it's warped, cracked, or has mineral buildup preventing a proper seal, it needs replacement. You can find replacement flappers at any hardware store for about $5-10.

Next, examine the chain connecting the flush handle to the flapper. If the chain is too long, the flapper won't lift fully when you flush. If it's too short, the flapper can't close properly. Adjust the chain so there's about 1/2 inch of slack when the flapper is closed. Sometimes the chain gets tangled or disconnected entirely - a quick reattachment usually solves the problem.

Check your water level - it should sit about 1 inch below the rim of the toilet tank. If water is continuously flowing into the overflow tube, the fill valve may be stuck or the float needs adjustment. For older toilets with a ball float, gently bend the arm downward to lower the water level. For newer toilets with a cylinder float, there's usually an adjustment screw.

In Ottawa's hard water conditions, mineral buildup commonly causes these issues. If cleaning and adjustments don't work, the fill valve assembly may need replacement - this is a $20-30 part but requires more involved installation. While toilet repairs are generally DIY-friendly, if you're uncomfortable working inside the tank or the problem persists after these basic fixes, a licensed plumber can diagnose and repair the issue quickly, typically for $150-300 depending on parts needed.

Don't let a running toilet continue - it can waste 200+ gallons per day and significantly increase your water bill.

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