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Water Leak Cost Calculator

Estimate the annual cost of a running toilet or dripping fixture based on its leak rate.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-27 · v1.1.0

Market
Imperial · sales tax

Estimated annual cost

86.72 $ per year

Check your inputs

Many utilities also charge a sewer fee based on metered water use, which can roughly double the real cost impact of a leak beyond the water rate alone.

Water wasted per year
17356.1 gal

At the values currently entered, the estimated annual cost works out to 86.7 $ per year. Note that leak rate sits at the low end of the range this calculator was checked against, so treat the output as indicative rather than settled. Confidence is moderate: the method is sound, but real materials and site conditions vary. Figures are shown for United States, where IRC 2024 is the governing residential reference; switch the market above if you are building elsewhere.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • Annual volume wasted = leak rate × minutes per year; annual cost = volume wasted × your utility's volumetric water rate

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Frequently asked questions

How do I measure my leak's actual rate?
For a faucet, time how long it takes to fill a measured container (a 250 ml cup or a 1-cup measure) and convert to litres or gallons per minute. For a running toilet, add a few drops of food coloring to the tank — if it appears in the bowl without flushing, it's leaking, and a bucket test under the fill valve can estimate the rate.
Where do I find my water rate?
On your utility bill, as a volumetric charge — typically quoted per cubic meter (per kilolitre in some regions) or per 1,000 gallons in the US. Switch the unit system above and enter it exactly as billed.
Does a small drip really cost anything?
A slow drip wastes surprisingly little money on its own — often only a few dollars a year — but leaks tend to worsen, and toilets that run intermittently are easy to underestimate. The bigger risk from any persistent leak is moisture damage, not the water bill.