How much does it cost to flush a toilet?
How much does it cost to flush a toilet?
$0.01 – $0.03 per flush
$23.73 – $118.63 per year
$0.006 – $0.06 per flush (all toilet types)
Average cost to flush a toilet
A single toilet flush costs about $0.01 to $0.03, depending on the type of toilet you have and your local water and sewer rates. A standard 1.6-gallon toilet costs roughly 1.3 cents per flush, while older models using 3.5 gallons or more can cost nearly 3 cents per flush.
While a penny or two may seem trivial, those costs add up quickly. The average person flushes about five times per day, and toilets account for up to 30% of a household's total indoor water consumption, according to the EPA. For a family of four, that translates to roughly $95 per year just for flushing.
| Toilet type | Gallons per flush | Cost per flush |
|---|---|---|
| WaterSense (high-efficiency) | 1.28 gallons | $0.01 |
| Standard low-flow (post-1994) | 1.6 gallons | $0.013 |
| Older toilet (pre-1994) | 3.5 gallons | $0.028 |
| Very old toilet (pre-1980) | 5 to 7 gallons | $0.04 to $0.06 |
Cost per flush by toilet type
The single biggest factor in what you pay per flush is how much water your toilet uses. Federal law changed the landscape in 1994, capping new residential toilets at 1.6 gallons per flush. Before that, toilets commonly used 3.5 to 7 gallons. Here's how each generation of toilet compares.
| Toilet category | Water per flush | Estimated cost per flush | Annual cost (1 person, 5 flushes/day) |
|---|---|---|---|
| EPA WaterSense certified | 1.28 gallons | $0.01 | $18.25 |
| Standard low-flow | 1.6 gallons | $0.013 | $23.73 |
| Older standard toilet | 3.5 gallons | $0.028 | $51.10 |
| Vintage toilet (pre-1980) | 5 to 7 gallons | $0.04 to $0.06 | $73 to $109.50 |
| Dual-flush (half flush) | 0.8 to 1.1 gallons | $0.006 to $0.009 | $10.95 to $16.43 |
WaterSense toilets
WaterSense-labeled toilets, certified by the EPA, use no more than 1.28 gallons per flush. At roughly a penny per flush, they are the most affordable option for daily use. For an average family, upgrading to WaterSense models can reduce toilet water usage by 20% to 60%, saving about 13,000 gallons of water annually.
That efficiency translates to about $110 per year in water cost savings and up to $2,200 over the lifespan of the toilet, according to EPA estimates.
Standard 1.6-gallon toilets
Toilets manufactured after 1994 are required to use no more than 1.6 gallons per flush. These models cost about 1.3 cents per flush, making them significantly cheaper to operate than older toilets. Most homes built in the last 30 years have this type installed.
Older and vintage toilets
Toilets manufactured before 1994 commonly use 3.5 gallons per flush, and models from the 1960s or earlier can use 5 to 7 gallons. At 2.8 to 6 cents per flush, these older toilets cost two to five times as much to operate as modern low-flow models. If your home still has one, replacing it is one of the simplest ways to lower your water bill.
Dual-flush toilets
Dual-flush toilets offer two buttons: one for liquid waste (typically 0.8 to 1.1 gallons) and one for solid waste (1.6 gallons). Since most flushes are for liquid waste, dual-flush models can reduce your per-flush cost to as little as $0.006. Over a year, that adds up to meaningful savings, especially in larger households.
Daily and annual flushing costs
Most people flush the toilet about five times per day. Multiply that across an entire household and throughout the year, and the costs become more noticeable. The table below shows typical daily and yearly flushing costs for different household sizes using a standard 1.6-gallon toilet.
| Household size | Flushes per day | Daily cost | Monthly cost | Annual cost |
|---|---|---|---|---|
| 1 person | 5 | $0.065 | $1.98 | $23.73 |
| 2 people | 10 | $0.13 | $3.95 | $47.45 |
| 3 people | 15 | $0.195 | $5.93 | $71.18 |
| 4 people | 20 | $0.26 | $7.90 | $94.90 |
| 5 people | 25 | $0.325 | $9.88 | $118.63 |
For a family of four using a standard 1.6-gallon toilet, flushing alone costs about $95 per year. Switching to a WaterSense toilet would bring that figure closer to $73 per year, a savings of roughly $22 annually on flushing alone.
Factors that affect the cost per flush
Several variables determine exactly how much each flush costs in your home. Understanding these factors can help you identify opportunities to save on your water bill.
| Factor | Impact on cost |
|---|---|
| Toilet type and age | Older toilets use 2x to 5x more water per flush |
| Local water rates | Rates vary widely, from $2 to $12+ per 1,000 gallons |
| Sewer/wastewater charges | Often equal to or greater than water supply charges |
| Number of flushes per day | More occupants means more flushes and higher costs |
| Leaking flapper valve | Can waste 200+ gallons per day, adding significant cost |
| Multiple flushes per use | Doubles or triples water consumption per visit |
Water volume per flush
This is the most straightforward factor. A toilet that uses 1.28 gallons per flush costs less than half of what a 3.5-gallon toilet costs. If you don't know how much water your toilet uses, check the stamp or sticker inside the tank, which typically lists the gallons per flush (GPF) rating.
Local water and sewer rates
Water prices vary dramatically across the United States. Some municipalities charge as little as $2 per 1,000 gallons, while others (particularly in California, the Southwest, and major metro areas) charge $10 or more per 1,000 gallons. Sewer charges are typically calculated based on water usage and often exceed the cost of the water itself.
Leaking toilets
A toilet with a leaking flapper valve can silently waste 200 gallons or more per day. That's the equivalent of flushing your toilet over 125 extra times daily. A simple dye test (dropping food coloring into the tank and watching for color in the bowl) can reveal whether your toilet is leaking. If you find a leak, a toilet repair is typically inexpensive and well worth the investment.
Multiple flushes
Some toilets, particularly lower-quality low-flow models, may require two or more flushes to clear waste effectively. Consumer Reports testing found that while most modern toilets clear waste in one or two flushes, the least efficient models need four or five flushes. This effectively multiplies your cost per use several times over.
Water and sewer rates across the U.S.
The average monthly household water bill in the U.S. is about $104, according to a Bluefield Research study of 50 cities. Water bills have risen 31% since 2012, far outpacing general inflation. These rising costs make the price of every flush increasingly significant.
| Region/city type | Approximate cost per 1,000 gallons | Estimated cost per flush (1.6-gallon toilet) |
|---|---|---|
| Low-cost rural areas | $2 to $4 | $0.003 to $0.006 |
| National average | $6 to $8 | $0.010 to $0.013 |
| High-cost metro areas | $10 to $15 | $0.016 to $0.024 |
| California/Southwest desert | $12 to $20+ | $0.019 to $0.032+ |
Keep in mind that most water utilities also charge a separate sewer or wastewater fee, which is usually calculated as a percentage of your water usage. When you combine both the water supply charge and the sewer charge, the effective cost per flush roughly doubles in many areas.
How to reduce your flushing costs
Lowering the cost of flushing doesn't require major lifestyle changes. A few practical upgrades and habits can cut your toilet-related water costs by 20% to 60%.
| Strategy | Estimated savings |
|---|---|
| Upgrade to a WaterSense toilet | $110 per year (up to $2,200 over toilet lifespan) |
| Install a dual-flush conversion kit | $25 to $50 for the kit; saves 30% to 50% on flush water |
| Fix a leaking flapper valve | Prevents 200+ gallons/day of waste |
| Displace water in the tank | Reduces water per flush by 0.5 to 1 gallon |
| Follow the "if it's yellow" rule | Reduces total daily flushes by 30% to 50% |
Upgrade to a WaterSense toilet
Replacing an older toilet with a WaterSense-certified model is the most impactful change you can make. These toilets use just 1.28 gallons per flush and can save the average family about 13,000 gallons of water per year. The EPA estimates savings of $110 annually in water costs. A new toilet installation typically costs $350 to $800, making this upgrade one that pays for itself in just a few years.
To put the potential impact in perspective, if every toilet in the U.S. were replaced with a WaterSense model, it would save approximately 520 billion gallons of water per year. That's roughly the amount of water that flows over Niagara Falls in 12 days.
Fix leaking toilets
A constantly running toilet can add $50 to $200+ to your monthly water bill. Replacing a worn flapper valve typically costs less than $10 for parts and takes about 15 minutes. This is one of the highest-return home maintenance tasks you can perform.
Displace water in the tank
If you're not ready to replace your toilet, you can reduce water usage by placing a sealed, water-filled container (like a half-gallon jug) in the tank. This displaces water and reduces the volume used per flush. Avoid using bricks, as they can deteriorate and damage the flush mechanism.
Install a dual-flush conversion kit
Dual-flush conversion kits cost $25 to $50 and can be installed on most existing toilets. They add a two-button flush mechanism, giving you a low-volume option for liquid waste and a full flush for solids. This simple upgrade can reduce your toilet water consumption by 30% to 50%.
How to calculate your cost per flush
You can estimate your own cost per flush with a simple formula. All you need is your toilet's gallons-per-flush rating and your local water and sewer rate.
| Step | Action |
|---|---|
| 1 | Find your toilet's GPF (gallons per flush) on the tank stamp |
| 2 | Find your combined water and sewer rate per gallon on your utility bill |
| 3 | Multiply GPF × cost per gallon = cost per flush |
| 4 | Multiply cost per flush × flushes per day × 365 = annual cost |
Example: If your toilet uses 1.6 gallons per flush and your combined water and sewer rate is $0.008 per gallon (about $8 per 1,000 gallons), each flush costs 1.6 × $0.008 = $0.0128, or about 1.3 cents.
For a household of four people flushing five times each per day, that's 20 flushes × $0.0128 = $0.256 per day, or about $93.44 per year.
Frequently asked questions
How much does one toilet flush cost?
A single flush costs $0.01 to $0.03 for most households. A modern 1.6-gallon toilet costs about 1.3 cents per flush, while a WaterSense toilet costs roughly 1 cent. Older toilets using 3.5 gallons or more cost around 2.8 cents per flush.
How much does it cost to flush a toilet per year?
For one person flushing five times a day with a standard 1.6-gallon toilet, the annual cost is about $24. For a family of four, annual flushing costs are approximately $95. Upgrading to a WaterSense toilet can lower that to about $73 per year.
How many gallons does a toilet flush use?
Modern toilets manufactured after 1994 use 1.6 gallons per flush. WaterSense-certified toilets use 1.28 gallons. Older toilets from before 1994 typically use 3.5 to 7 gallons per flush.
What percentage of home water use comes from toilets?
Toilets account for up to 30% of a household's total indoor water consumption, according to the EPA. This makes them the single largest water-using fixture in most homes, ahead of showers, faucets, and washing machines.
How much can I save by upgrading my toilet?
Switching from an older 3.5-gallon toilet to a WaterSense model saves approximately $110 per year in water costs. Over the life of the toilet, savings can reach up to $2,200. The average family also saves about 13,000 gallons of water annually with the upgrade.
How much does a leaking toilet cost?
A leaking toilet can waste 200 or more gallons per day, potentially adding $50 to $200+ to your monthly water bill. A worn flapper valve is the most common cause and costs less than $10 to replace. Testing for leaks is as simple as adding food coloring to the tank and checking for color in the bowl after 15 minutes.