How Much Water Does a Running Toilet Use?

A running toilet wastes more water than most people realize. Depending on the severity of the leak, a running toilet can waste hundreds or even thousands of gallons of water every single day. That water waste adds up fast on your utility bill.

In this guide, we'll cover how to calculate your water loss, what's causing the problem, how to detect a leak, your repair options, and when it's time to call a plumber. Situations like toilet bubbling when washer drains, could also be time to consult a plumber.

How Much Water Does a Running Toilet Use?

The average leaking toilet wastes between 1 and 5 gallons per minute, depending on how severe the leak is. From a few hundred to over 7,000 gallons per day is how many gallons per day a leaky toilet ends up wasting. Due to a silent leak, this many gallons of water per day isn't always obvious.

Running Toilet Water Waste Breakdown by Leak Severity

Water flow, through a faulty toilet, can range from a few drops per minute to a constant stream, and the difference in wasted water can be quite a lot.

A slow leak is the hardest to catch. Water usage increases gradually, and there's often no sound to tip you off. A moderate leak is more noticeable, as you may be able to hear occasional hissing or see the tank refilling on its own. A large leak is hard to miss, with water running continuously and bills spiking quickly.

Here's how the numbers break down:

Leak Severity	Gallons Per Hour	Gallons a Day	Gallons Per Week
Slow	3	78	546
Moderate	30	720	5,040
Severe	60	1,440	10,080

How Much Can a Running Toilet Increase Your Water Bill?

Every gallon that runs through a faulty toilet is a gallon your water company measures and charges you for. The cost adds up faster than most people expect.

To calculate the impact of a running toilet on your water bill, here's the formula to use:

Gallons wasted x Local water rates = Estimated loss.

Most utilities in Georgia charge between $0.005 and $0.01 per gallon (which is roughly $5 to $10 per 1,000 gallons). Using a moderate leak as an example, here are the estimated costs to expect:

• 10 days: 7,200 gallons — roughly $36 to $72

• 30 days: 21,600 gallons — roughly $108 to $216

• 90 days: 64,800 gallons — roughly $324 to $648

Going over the numbers, that's a lot of money lost to a problem that's often fixable in under an hour. A high water bill with no obvious explanation is one of the first signs homeowners notice.

What Causes a Running Toilet?

The most common culprits behind a leaking toilet are often the ones that live inside the tank. According to the Environmental Protection Agency (EPA), a toilet running continuously is not normal, and here's what you should be looking for to diagnose the problem:

Worn or Damaged Flapper Valve

The flapper valve sits at the bottom of the tank and seals the flush valve opening between flushes. When it wears out, develops small cuts, or warps over time, expect water to keep on leaking into the bowl. Older toilets with original factory parts are especially prone to this.

Faulty Fill Valve

After a flush, there is a component inside the tank that regulates water refilling, and it's called the fill valve. When it ages or mineral buildup interferes with the mechanism, it may not shut off properly, leaving water running long after the tank is full.

Overflow Tube Problems

If the water level inside the tank is set too high, water will continue to spill into the overflow tube and drain into the bowl. Because the toilet appears to be functioning normally, this problem often goes unnoticed.

Chain and Float Issues

A chain that's too short, too long, or tangled can hold the flapper open slightly. An improperly adjusted float arm can also prevent the tank from reading the correct water level, causing it to overfill.

Cracked Components or Seal Failures

A hole or crack in the tank or bowl, or a failing seal on internal gaskets, can cause a leaky toilet that no amount of part-swapping will fix. These issues are less common but more serious.

How to Tell If Your Toilet Is Running

Here are the signs that your toilet is running:

• A constant hissing sound, even when no one has flushed

• A tank that flows and refills on its own between uses

• Ripples or movement in the toilet bowl water when the toilet hasn't been touched

• An unexpected spike in your water bill

• Running water despite turning off every fixture

How to Check for a Toilet Leak

You don't need special equipment to check for leaks. Leak detection specialists North Georgia may be able to help if needed. However, these four steps can help identify a running toilet:

1. Stand near the toilet to hear a hissing sound coming from the toilet tank.

2. Remove the tank lid and add a few drops of food coloring. Wait 30 minutes without flushing, and if the color appears in the bowl, the flapper is leaking.

3. Look for visible cracks on the tank and bowl surfaces and check for moisture around the base.

4. Turn off every fixture in the house and check your water meter reading. Any movement within 30 minutes confirms water is leaking somewhere in the system.

DIY Fixes for a Running Toilet

Most running toilet repairs are straightforward. Here's how to work through them step by step:

1. Cut off the water supply using the shut-off valve and drain the tank by flushing it.

2. Find a compatible flapper by taking the old one to a nearby hardware store. Once you've got the right flapper, install it and press down firmly to verify the seal is complete before restoring water pressure.

3. Adjust the fill valve to bring the water level about an inch below the overflow tube to stop overfilling after a flush. You may have to replace the entire valve if adjusting it doesn't fix the problem.

4. Adjust the chain connecting the flush handle to the flapper. It should have about half an inch of slack. Too tight and it holds the flapper open. Reset the float height so the water level sits at the marked line inside the tank.

When to Call a Plumber for a Running Toilet

Fixing a water leak requires expertise and skill. It's best to call a licensed, experienced plumber if you're facing any of the following issues:

• A persistent drip after replacing the flapper or fill valve

• Visible cracks in the tank or bowl

• An overflowing toilet despite trying to resolve the problem

• Two toilets running water simultaneously

• Faucet leaks alongside the toilet problem

• Signs of hidden water leaks inside the walls or under the floor

• Multiple symptoms due to older pipes

• Unexpectedly high water bills despite DIY repairs

Need Help Fixing a Running Toilet? Call Ironclad Plumbing!

Don't expect a leaking toilet to fix itself, and every day it runs is money down the drain. Ironclad Plumbing serves Jasper and the surrounding Georgia cities with prompt, reliable service.

Whether the toilet needs repair or replacement, or there is an even bigger problem to deal with, you can rely on our skilled team to get the job done. Contact us today to schedule service!