What we actually find behind running, rocking and mystery-flushing toilets
Toilet rebuilds are one of the most common jobs in our books, which means we spend a lot of time answering the same good questions in Everett, Mukilteo and Edmonds bathrooms. Here are the ones that come up most — answered the way we would standing next to your toilet, not the way a parts catalog would. For the basics on rebuilds, costs and timelines, our toilet repair page covers the service itself.
How do I find out which part is making my toilet run?
Listen first, then look. A hiss that never stops points at the fill valve; water trickling into the bowl points at the flapper or its seat; water disappearing down the overflow tube means the fill level is set too high. Lift the tank lid and watch for a minute — the culprit usually announces itself.
If the tank behaves while you watch it, run the dye test below. Intermittent problems leave evidence even when they refuse to perform on demand.
My toilet flushes by itself every so often. What is that?
Ghost flushing — and it isn’t a ghost, it’s a slow leak. The flapper is letting tank water seep into the bowl until the level drops far enough that the fill valve wakes up and refills it. Drop food coloring into the tank, wait twenty minutes without flushing, and check the bowl: color means the flapper is done.
We run that same dye test on service calls because it settles the question in minutes, with no guesswork.
Is a running toilet actually wasting much water?
More than almost anything else in the house. A toilet running around the clock moves a steady stream every hour of every day, and it is one of the first things we look for when someone calls about a water bill that jumped with no explanation. The repair usually costs far less than the bill spike that revealed it.
Why does my toilet rock, and is that serious?
A rocking toilet is worth taking seriously. Sometimes it is just loose closet bolts, but rocking also breaks the wax seal under the base — and once that seal is compromised, every flush can seep where you cannot see it. Caulking over a rocking toilet hides the symptom while the subfloor pays for it.
The honest fix is pulling the toilet, checking the flange, and resetting it on a new wax ring with the bolts snug and even.
Why does my bathroom smell like sewer even though the toilet works?
The usual suspects are a failed wax seal letting sewer gas past the base, or a fixture trap that has dried out and stopped blocking the pipe’s air. If the smell tracks to the toilet’s base — especially alongside any rocking — the wax seal is the bet.
If it comes and goes near a rarely used tub or floor drain instead, run water into that drain and see if the smell fades over the next day.
Should I use drop-in tank cleaning tablets?
We’d rather you didn’t. The chlorine sitting in the tank chews up flappers, gaskets and fill-valve seals from the inside, and a fair share of the running toilets we repair trace straight back to a bleach tablet doing exactly what bleach does to rubber. Clean the bowl from the bowl side and let the tank parts live.
Why is my toilet slow to refill after a flush?
Usually a tired or clogged fill valve — debris and mineral scale narrow its inlet over the years until refills crawl. Occasionally the problem is bigger than the toilet: a partly closed angle stop, or low pressure affecting the whole bathroom. If other fixtures feel weak too, it is worth checking the house’s water pressure rather than blaming the valve.
Do I need a plumber for a toilet repair, or is it a DIY job?
Some of it is honest DIY: a flapper swap or a fill-valve cartridge is within reach if the shutoff valve works and you follow the instructions. Where it earns a plumber is everything at the base — wax seals, flanges, rocking — and any repair blocked by an angle stop that will not close.
Half our toilet calls start exactly there — with a shutoff that gave up before the toilet did.
When the Toilet Is Telling You Something Bigger
Most toilet problems are the toilet. But a toilet that gurgles when other fixtures drain, or backs up alongside a slow tub, is talking about the drain line instead — that conversation belongs on our drain cleaning page. And when one toilet’s parts keep dying young, gauge the house pressure before buying the third fill valve; fixtures wear fast in homes running hot.
A toilet that won’t behave? Call the Mukilteo office and describe what it’s doing — half the time we can tell you the likely part before we arrive. Related: toilet repair and replacement · water pressure and PRVs · drain cleaning · plumbing in Mukilteo · plumbing in Everett