Why Your Toilet Keeps Running - and How to Fix It

How a Toilet Should Work

When you flush, water leaves the tank through the flush valve, then the fill valve refills the tank to a set level and stops. A running toilet means that cycle never fully stops: water is leaking from tank to bowl, or the fill valve is not shutting off. The result is constant refilling, a faint hissing or trickling sound, and wasted water.

The Usual Culprits

A worn flapper is the most common cause. It seals the flush valve, and when it warps or deteriorates, water seeps into the bowl continuously. A fill valve set too high lets water flow into the overflow tube nonstop. A cracked overflow tube, a tangled chain, or a faulty fill valve can cause the same symptom. A simple test: add food colouring to the tank, wait without flushing, and see if colour appears in the bowl - if it does, the flapper is leaking.

Fixes and When to Call

Flappers and fill valves are common, inexpensive repairs, and adjusting the water level is straightforward. If the porcelain is cracked, the toilet rocks, or water appears at the base, the problem is larger than a tank part and needs professional attention. If a toilet runs after a part replacement, or if several toilets have the same problem, call (615) 576-1152 - there may be a pressure or supply issue behind it.

Why Not to Ignore It

A running toilet can waste a remarkable amount of water over weeks and months, raising bills and wearing the fill valve further. It is one of the cheapest plumbing problems to fix early and one of the most wasteful to ignore.

Related Services and Places

Springfield-Specific Notes

Springfield homes share a few traits that shape how these problems play out. Hard water leaves scale in heaters, aerators and pipes across Middle Tennessee, so a problem that looks like a single faulty part is sometimes part of a wider scale issue. Older homes in Springfield and nearby towns may still have galvanized or cast-iron pipe, which narrows and corrodes from the inside and changes what a lasting repair looks like. Mature trees near sewer lines can send roots into older joints, and winter freezes test pipes in crawl spaces, garages and exterior walls. When you describe your home - roughly how old it is, whether you are on municipal or well water if you know, and what symptoms you have noticed - we can diagnose faster and bring the parts most likely needed.

Seasonal timing matters too. Before winter, check insulation on exposed pipes, disconnect garden hoses, and know where your main shut-off is. Before a heavy rain season, test a sump pump if you have one. And at any time of year, a rising water bill, a new stain, or a drain that keeps returning to slow are worth a call sooner rather than later: early diagnosis is almost always cheaper than repair after damage has spread.

Quick Checklist Before You Call

• Note exactly what is happening, where, and when it started.
• Check whether other fixtures are affected - that tells us if the problem is local or in a shared line.
• If water is leaking, try the nearest shut-off valve, or the main shut-off, if you can reach it safely.
• Do not use a fixture that is backing up, and avoid chemical drain cleaners on a stubborn clog.
• If you smell gas, leave the home and call 911 or your gas utility from outside - do not investigate inside.
• Have your town or neighbourhood ready so we can give you a realistic arrival window.

Need Help With This Problem?

Call (615) 576-1152 for local help in Springfield, TN and nearby towns. See also all plumbing services and our cost guide.

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