Why is Your Toilet Hissing?
If your toilet makes a hissing noise, it means you likely have one of the following problems:
Debris that is stuck in the fill valve
A broken float
We will explain these two problems, why they create your toilet’s hissing sound, and what to do about it.
If you need a plumber to fix your toilets hissing sound immediately, call us and we will send a plumber out to you.
Problem number one- debris stuck in the fill valve.
The fill valve is a part that is near the left side of your toilet tank. The valve works to fill the toilet tank with water after each flush. When it works properly, the fill valve will shut off as soon as the water in the tank reaches a certain level.
The fill valve can stop working right if debris gets caught in it. The debris will keep the valve from closing correctly. It also pushes rough a restricted opening and that causes the hissing noise