THE SHORT ANSWER
A leaking flapper, incorrect chain length, fill-valve issue or overflow-tube setting is often responsible. Removing the tank lid and checking those parts may reveal an easy fix. If water keeps running or the toilet is leaking onto the floor, have it repaired.
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For more context about this type of plumbing issue, read our related Oklahoma City guide.
Read the related VIP plumbing guideEducational information, not a remote diagnosis. The right repair requires an onsite assessment. Plumbing conditions, safety concerns and local requirements vary. Stop using unsafe equipment and seek qualified help for gas, sewage, electricity or flooding hazards. See how we develop and update our homeowner guides.
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