A toilet that runs constantly is almost always the flapper, the rubber seal at the bottom of the tank. It is a quick fix and one every Longmont homeowner can learn.
How the flapper works
When you flush, the flapper lifts to let tank water rush into the bowl, then drops back to seal the opening. Over time the rubber warps, cracks, or collects mineral buildup, so it no longer seals and water leaks into the bowl nonstop.
Confirm it is the flapper
Put a few drops of food coloring in the tank and wait 15 minutes without flushing. If the color shows up in the bowl, the flapper is leaking. In Longmont homes with hard water, the test is worth doing once a year.
The swap is simple
Shut off the water, flush to empty the tank, and unhook the old flapper from the flush valve. Clip the new one in place and reattach the chain with about a half-inch of slack so it closes cleanly.
Pick the right part
Flappers come in a few sizes, and a universal model usually fits, but matching the original is safest. freezing winters and hard water are both common, and older homes often have aging supply lines A pro can identify the right one in seconds if the parts aisle is confusing.
Stop the running
A running toilet is just money down the drain. If the flapper swap does not quiet it, call 888-217-3585 and Longmont Plumber Connect will match you with a Longmont pro who finds the real cause.
Plumbing in Longmont: what to know
In Longmont, freezing winters and hard water are both common, and older homes often have aging supply lines. Pros in our network know the local quirks and bring the right parts on the first visit.
Across Broomfield County — from Mead, Frederick and Firestone to ZIP codes like 80501, 80504, 80503 — homeowners deal with the same kinds of issues. The tips above apply locally, and when a job goes beyond a quick fix, a vetted local pro is only a call away.
Need a hand in Longmont?
If a plumbing issue is beyond a quick fix, don't wait for it to get worse. Call 888-217-3585 and Longmont Plumber Connect will match you with a vetted local pro — usually within minutes. Learn more about plumbing help in Longmont.