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The average cost to replace a toilet fill valve is around $100, and prices range from $50 up to $150, depending on your location, the experience of the plumber, and how accessible your toilet is. In most cases, a professional plumber can replace your fill valve in under an hour, although it might take longer if they also need to fix or replace other components at the same time.

Toilets typically connect to your main vent stack, a vertical pipe that runs through all finished levels of your home and exits through the roof. It’s located behind the walls, but if you have an unfinished basement or a utility closet, you may find a portion of it running the vertical length of the space. Some basement toilets use an air admittance valve instead, which is a small vent located in the wall directly behind the toilet that extends upward a few feet from the drain.

If a bolt at the bottom of your toilet tank is loose, it can directly cause a leak. If a bolt securing the toilet base to the floor is loose, it won’t directly cause a leak but can lead to the same result over time. That’s because the loose bolts will eventually move the wax seal or cause cracks in the bowl from the toilet being wobbly.

If you notice that your toilet is leaking puddles near the base, the leak is coming from your toilet bowl, and the water could be unsanitary. This is a situation that needs to be dealt with immediately—call a nearby plumbing repair pro right away. A contained leak from tank to bowl is not as urgent a situation, but it could be raising the cost of your water bill—have it looked at as soon as you can.