Should you repair or replace a toilet? Costs, water use and permits

Updated November 10, 2026 · KeystoneProGuide editorial team

Should you fix the toilet or replace it?

The EPA frames the choice around water. Its WaterSense program says toilets are by far the main source of water use in the home, nearly 30 percent of indoor use, and that older toilets can use as much as 6 gallons per flush. The current federal standard is 1.6 gallons, and WaterSense models use 1.28 gallons or less.

What usually makes a toilet run or leak?

The flapper, most often. The EPA says most toilet leaks come from old or worn flappers, the rubber, plastic or silicone seal that holds water in the tank, and that a worn one can make the toilet flush on its own or silently leak thousands of gallons a year. It recommends checking the flapper periodically and replacing it at least every five years, and calls the job quick and easy.

To find out whether yours leaks, put a few drops of food coloring in the tank. If color appears in the bowl within 10 minutes, it leaks. Flush right away so the dye does not stain.

The EPA's tips for the replacement are practical: bring the old flapper, or a photo, to the store; note its width and whether it has a foam float that may also need replacing; and check the owner's manual or the maker's website for the right part. If you would rather not, it suggests a hardware store or a licensed plumber for help.

When is replacement the better choice?

When the toilet is an older, high-volume model, or keeps leaking after the parts are changed. The EPA says replacing old, inefficient toilets with WaterSense labeled models can cut the water a family uses for toilets by 20 to 60 percent, nearly 13,000 gallons a year, and save more than $170 a year in water costs. It adds that many utilities offer rebates or vouchers that lower the price, and that a dual-flush model saves more by using a reduced flush for liquid waste.

On a septic system the case is stronger. The EPA notes that many older homes have toilets with 3.5- to 5-gallon tanks, that toilets account for 25 to 30 percent of household water use, and that a single leaky or running toilet can add as much as 200 gallons a day to what the system must treat.

Do low-flow toilets work as well?

The EPA says they now do. It acknowledges that the low-flow toilets of the 1990s were sometimes associated with performance problems such as double flushing, and says WaterSense performance criteria, including a test of how well a toilet clears waste, have since been adopted into the national plumbing fixture standard. Labeled models are independently certified for both performance and efficiency, and only those that complete third-party certification can carry the label.

What does a toilet repair or replacement cost?

The national surveys give these ranges:

The ranges are national, from Angi's 2026 table and from older pages elsewhere: HomeGuide dates its figures to 2023, and Fixr gives its $120 only as an example of how flat-rate pricing works. Angi says nearly all plumbers also charge a call fee for the visit.

Do you need a permit to replace a toilet?

It depends on the job and the town. Philadelphia's rules show the distinctions. The city says no plumbing permit is needed to remove and reinstall a toilet if no pipes or fixtures are replaced or moved. Replacing fixtures with the same kind qualifies for an EZ permit without plans, and the fee for replacing fixtures with no new piping in a one- or two-family home is $31, plus the filing fee and surcharges. Moving a toilet means relocating drain piping, which Pennsylvania's construction code does not treat as an ordinary repair. Outside the city, ask your municipality's code office.

Should you buy the toilet yourself?

You can, but ask first. The Better Business Bureau says some plumbers will not install fixtures customers supply, and that if a product you bought fails, removing or fixing it may be your responsibility rather than the plumber's. It suggests looking for products bearing the Uniform Plumbing Code stamp or approval from NSF. For water savings, look for the WaterSense label.

Can a new toilet lower your water bill noticeably?

For an old toilet, yes, by the EPA's figures above. The Philadelphia Water Department says the average household in the city uses about 154 gallons a day and that at least a third of that can be saved by repairing leaks and changing wasteful habits, about $12 on every bill.

Finding a leak covers the meter test for the rest of the house, what you can do yourself covers the safe small repairs, and plumbers who install toilets are on the plumbers directory page.

Sources

1. Residential Toilets, U.S. Environmental Protection Agency (WaterSense)
2. Fix a Leak Week, U.S. Environmental Protection Agency (WaterSense)
3. How to Care for Your Septic System, U.S. Environmental Protection Agency
4. How Much Does Plumbing Repair Cost? [2026 Data], Angi
5. How much does it cost to hire a plumber?, Fixr
6. How Much Does a Plumber Cost?, HomeGuide
7. Get a Plumbing Permit, City of Philadelphia
8. BBB Tip: Hiring a trusted and verified plumber can save you time and heartache, Better Business Bureau
9. Financial Assistance, Philadelphia Water Department
10. 34 Pa. Code § 403.62. Permit requirements and exemptions., Commonwealth of Pennsylvania (Pennsylvania Code)