Timberlake, Va. – September 11, 2026 -- A toilet that runs continuously can waste hundreds of gallons of water a month, often without homeowners noticing until their water bill spikes, according to plumbing expert Ken Settje of Plumb Care Plumbing Inc in Timberlake, Virginia.
A worn flapper is the most frequent culprit
The flapper, a rubber valve at the bottom of the toilet tank, lifts during a flush to release water and reseals to stop the flow. Over time, the material can deteriorate, warp, or accumulate mineral buildup, preventing a proper seal. This lets water leak slowly from the tank into the bowl, keeping the toilet running. Replacing the flapper often fixes the issue.
A faulty fill valve can leave water running after the tank fills
The fill valve controls tank refilling after a flush and should stop water flow once the correct level is reached. When it becomes faulty or misadjusted, water can keep flowing even after the tank is full. Warning signs include hissing sounds, constant water movement, or water spilling into the overflow tube.
An improperly sized chain can stop the flapper from sealing
The chain connecting the flush handle to the flapper needs to be the right length. A chain that's too short can prevent the flapper from closing completely, while one that's too long can get caught underneath it. Adjusting the chain length allows the flapper to seal and stop continuous water flow.
Small internal leaks add up over time
Even a minor, steady trickle of water into the bowl can waste significant amounts of water. Signs include the sound of running water when the toilet hasn't been used, periodic tank refilling, or an unexplained rise in the water bill.
Regular inspection can catch problems before they escalate
Checking the flapper, fill valve, and chain periodically helps homeowners catch wear before it causes major leaks. Mineral buildup from hard water can accelerate component wear, making routine inspection especially important in areas with higher mineral content. Older toilets may also develop recurring issues as internal seals degrade, and replacing an aging unit with a modern high-efficiency model can resolve persistent running problems while improving water conservation.