What's actually causing this
Toilets run when water continuously trickles from the tank into the bowl. The two most common culprits are a worn-out flapper that doesn't seal properly, and a fill valve that's stuck open or set too high.
What you'll need
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- Toilet flapper kit Shop →
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Step-by-step fix
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1
Diagnose the problem
Lift the tank lid and add a few drops of food coloring. If color appears in the bowl within 10 minutes without flushing, the flapper is leaking.
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2
Turn off the water supply
Turn the shutoff valve behind the toilet clockwise. Flush once to empty the tank.
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3
Replace the flapper
Unhook the old flapper from the overflow tube pegs. Snap the new flapper in place and reconnect the chain — leave about half an inch of slack.
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4
Adjust the fill valve
If water is running over the overflow tube, the water level is too high. Adjust the float arm or float ball downward until the water sits 1 inch below the top of the overflow tube.
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5
Turn water back on and test
Slowly open the shutoff valve. Let the tank fill and listen for any continued running after the fill cycle completes.
In Indianapolis, tap water is very hard (280–370 ppm). Indianapolis has very hard water. Mineral deposits accumulate rapidly. Water softeners are nearly universal. Hard water significantly reduces water heater lifespan to 7–9 years.
Plumbers in Indianapolis typically charge $80–135/hr. Most homeowners budget $800–2,500 for common repairs like fixture replacement, drain clearing, or valve repairs.
Indiana requires state licensing for master plumbers. Indianapolis requires permits. Homeowner exemptions limited.
Mix of pre-1950s and post-1980s construction. Older homes may have galvanized piping. Very hard water means water softeners nearly universal. Freeze-thaw cycles cause burst risk. Copper replacement common.
Indianapolis winters regularly bring freezing temperatures. Pipe freeze risk is real, especially in older homes with uninsulated exterior walls. Heat tape and foam insulation on exposed pipes are worthwhile investments. Know where your main water shutoff is before winter.
DIY in Indianapolis: Indianapolis is very DIY-friendly with the lowest labor costs among major metros. Affordable permitting and inspections support homeowner work. Very hard water management and freeze prevention are common DIY focuses.
- The tank or bowl has visible cracks.
- The toilet rocks or is loose at the base — this may indicate a wax ring failure.
- Water appears on the floor around the base after flushing.
Let Uncle AI diagnose it first.
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