A toilet keeps running after flushing most often because the flapper at the bottom of the tank is not sealing, so water keeps leaking into the bowl. Other common causes are a fill valve set too high and a chain that is too short or tangled.
Check the Flapper
The flapper is the rubber cover over the hole at the bottom of the tank. Over time it warps, hardens, or collects mineral buildup. When it does not close tightly, water slips into the bowl and the tank keeps refilling to replace it.
Take the lid off and watch after a flush. If the flapper does not drop flat, or water keeps trickling into the bowl, it may need replacing.
Look at the Water Level and Fill Valve
Most tanks have an overflow tube in the middle. If the water level rises above the top of that tube, water pours down it nonstop. The fill valve controls this level. A valve set too high or one that is worn out will not shut off when it should.
Check the Chain
The chain links the flush handle to the flapper. If it is too short, it holds the flapper open. If it is too long, it can get caught under the flapper. There should be a little slack, but not much.
Why a Running Toilet Matters
A running toilet can waste a large amount of water every day, which shows up on your bill. It also wears out the fill valve faster. Constant running at night can be the first clue that something inside the tank has failed.
Many of these parts are inexpensive, but finding the right fit can be tricky with older toilets. If adjusting the chain and flapper does not stop the water, repair help for toilets can sort out the right parts.
If you have more than one toilet acting up, you can have every bathroom checked in one visit. Call JPR Plumbing at (833) 603-1840.