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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.

First, check that you have cut off the water supply to your toilet. This is a project that can only be done safely if running water cannot reach your toilet fixture. If you're seeing water trickle out after you've confirmed that the water supply is shut off, you can probably rest assured that what you're seeing isn't a problem. It's common for leftover water to spill out when you're removing your toilet's fill valve. If something goes wrong while you're working on your toilet, you'll need to look at your home's policy to see if your homeowner insurance covers water damage.

You can tell if your toilet fill valve is full by removing the lid and taking a look. When you flush the toilet, the float is at the bottom of the tank, the water empties, and the fill valve opens. The float rises to the top as the tank fills again with water. When the float rises to the right level, the fill valve closes; if the valve is too high, your toilet may only partially flush, requiring you to adjust the float. 

The water in your toilet tank refills after each flush. So if you see dirty water in the bowl, you should check the tank to see if it’s coming from there. A dirty toilet tank can be the result of sediment in the water itself—-after all, the water will sit in the tank between flushes and can cause the interior to change into a dingy color. Faulty toilet components, like an old flapper, corroded tank lever or chain, or damaged seals, can also lead to dirty water as the materials break down inside the tank. You can clean the toilet tank or change out the old parts to give it a fresh start.