Reasons for Pressure Problems in a Toilet


If your toilet pressure seems low or doesn't flush enough, a couple of quick checks could fix the problem, or you might have to live with it. Low water pressure in a toilet is typically caused by low water flow. Low water flow simply means your toilet isn't getting enough water to get the job done.

Toilet Type

  • Before you begin tearing out the plumbing, check what type of toilet you have. Newer toilets have smaller tanks than older 5-gallon toilet models. The smaller 1.6-gallon tank provides less water and also tends to have less water pressure. If a new toilet is the source of your problem, you're stuck with it. Older tank models with larger 5-gallon tanks aren't made any more and shouldn't be used in home remodeling projects.

Closed Valve

  • If you've recently moved in or had plumbing work done, check for closed valves throughout your home. Low water flow or toilet pressure is often caused by an obstruction or closed valve somewhere in the line. Check the valve at the base of your toilet first. If the water valve on the toilet is fully open, take a look at the valve coming into your house. If you're not sure if the valve is open or closed, twist the valve knob until it closes, and then reopen it.

Tank Problems

  • If it's not a valve or the toilet itself, you probably have a problem in the toilet tank. If the bowl of the toilet isn't filling enough when you flush, but there's water in the tank, you could have a seal or inside valve problem, especially if your toilet seems to be running a lot. Replace the rubber seal or inside valve at the bottom of your toilet tank. The part will cost you less than a couple of dollars at a home improvement store. If the tank isn't filling and you checked all the water valves through the house including the main, you may have an obstruction in the pipe, which typically requires a plumber.

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