Plumbing leaks range from a dripping faucet to large, continuously flowing faults. The available evidence spans U.S. household estimates, North American residential end-use studies, illustrative fixture scenarios, and England’s reported water-network leakage, so the measures below are kept separate by population, period, unit, and definition.
Key Plumbing Leak Statistics
The most broadly useful figures are:
- In the EPA WaterSense estimate accessed in 2026, a U.S. average family wasted 180 gallons per week from household leaks.
- In the same EPA estimate, a U.S. average family wasted 9,400 gallons per year from household leaks.
- In the EPA estimate accessed in 2026, U.S. household leaks wasted nearly 900 billion gallons annually.
- EPA equated that national estimate with the annual household water use of nearly 11 million U.S. homes.
- In the 2019 USGS example, a constantly leaking toilet wasted about 22 gallons per day.
- In the 2019 USGS example, a household water line leaking one gallon every 10 minutes lost 144 gallons per day.
- EPA said fixing easily corrected household leaks could save about 10% on U.S. homeowners’ water bills.
- During REUW2016 data collection, only 5% of existing North American single-family homes were completely free of detected leaks.
- In REUW2016, 80% of studied homes had daily leak volumes of 20 gallons or less.
- Those homes represented 17% of the total leaked volume identified in REUW2016.
- EPA’s 2019 reference model used 4.3 gallons per household per day as the median daily leak volume.
- The EPA 2019 model assumed checklist actions could produce a 50% reduction in leak waste.
- Average leakage fell from 9.5 to 7.9 gallons per person per day between REUW1999 and REUW2016.
- USGS measured sampled kitchen and bathroom faucet drips at approximately 0.2 to 0.333 milliliters per drip in measurements reported in 2019.
- EPA’s severe stuck-fill-valve example estimated 4,300 gallons per toilet per day.
- England’s reported leakage declined from 3,341.2 million litres per day in 2005/06 to 2,617.4137 million litres per day in 2024/25.
- Average daily indoor water use fell from 69.3 to 58.6 gallons per person between REUW1999 and REUW2016.
Contents
- Household water waste and annual plumbing leak scale
- Residential plumbing leak prevalence and concentration
- Toilet, faucet and supply-line leak flows
- England plumbing leak trends and reported network leakage
- Water-use trends and efficiency outcomes
Household Water Waste and Annual Plumbing Leak Scale
EPA WaterSense’s household figures are estimates for an average U.S. family, not a claim that every family has the same leak or that every home is leaking at one fixed rate.
- The EPA WaterSense fact page, accessed in 2026, estimates 180 gallons per household per week wasted by household leaks for a U.S. average family.
- The same source expresses the estimate as 9,400 gallons per household per year, and as more than 300 laundry loads annually.
- At national scale, EPA estimates household leaks waste nearly 900 billion gallons per year in the United States.
- EPA compares that volume with the annual household water use of nearly 11 million U.S. homes; this is an equivalence, not a direct count of homes with leaks.
- EPA says fixing easily corrected household leaks can save homeowners about 10% on water bills, although the result depends on the leak and local billing structure.
The USGS examples show why flow duration matters. They are illustrative constant-flow scenarios rather than population averages.
- A constantly leaking toilet in the 2019 USGS educational example wasted about 22 gallons per day, or about 8,000 gallons per year.
- A household water line leaking one gallon every 10 minutes lost 144 gallons per day, or 52,560 gallons per year, in the same USGS examples.
Sources: EPA WaterSense Statistics and Facts; USGS Water Q&A: Does a little leak in my house really waste water?
Residential Plumbing Leak Prevalence and Concentration
The Residential End Uses of Water studies describe detected leakage in studied North American homes. “Leak-free” means no leak was detected during the collection period, not that a home could never leak.
| Measure | Population or reference | Result |
|---|---|---|
| Homes completely free of detected leaks | Existing North American single-family homes, REUW2016 | 5% |
| Homes with daily leak volume of 20 gallons or less | REUW2016 homes | 80% |
| Share of total leaked volume from that group | REUW2016 homes | 17% |
| Median daily leak volume | High-efficiency new homes, 2011 study | 2.8 gallons per home |
| EPA baseline reference median | REUW2016-based technical evaluation | 4.3 gallons per household per day |
The distribution is important: most homes in the REUW2016 sample were at or below 20 gallons per day, but that group accounted for only 17% of measured leaked volume. This indicates that leakage was concentrated among a smaller set of higher-volume observations in that study, without establishing a national allocation.
EPA’s 2019 WaterSense technical evaluation modeled checklist actions as reducing leak waste by 50%. In its reference case, the 4.3-gallon baseline corresponded to a modeled reduction of 2.15 gallons per household per day, leaving a modeled remainder of 2.15 gallons per household per day; these are model outputs, not measured post-installation savings.
The earlier and updated REUW studies reported average residential leakage of 9.5 gallons per person per day in REUW1999 and 7.9 gallons per person per day in REUW2016. The studies have different populations and measurement designs, so the values are not directly interchangeable with household medians.
Source: WaterSense Draft Technical Evaluation Process for Approving Home Certification Methods, Version 1.0
Toilet, Faucet and Supply-Line Leak Flows
Fixture-level measurements help define what “a drip” means, but USGS notes there is no scientific universal definition of drip volume. The sampled faucet measurements and representative assumptions below should therefore be read as examples, not fixture standards.
- USGS measurements reported in 2019 put kitchen and bathroom sink faucet drips at approximately 0.2 to 0.333 milliliters per drip.
- A bathroom tub example was about 0.5 milliliters per drip.
- USGS used 0.25 milliliters per drip as a representative kitchen-faucet value for its educational calculations.
- At that representative volume, one gallon equals about 15,140 drips, while one liter equals about 4,000 drips.
The potential cost and volume can become much larger when a fault is continuous rather than intermittent. EPA’s WaterSense leak guide gives severe illustrative scenarios whose dollar results depend on local rates.
- A stuck toilet fill valve was estimated at 4,300 gallons per toilet per day and up to $1,400 per month in water charges.
- A drip-irrigation malfunction leaking one gallon per minute was estimated at $5,700 per year.
These irrigation figures concern an outdoor system rather than indoor plumbing, and both cost examples are upper-bound illustrations rather than average household bills. EPA also reports that WaterSense-labeled bathroom faucets use 30% less water than standard models without a noticeable flow difference; that is a product-program performance comparison, not a leak-prevalence estimate.
Source: USGS Water Q&A: Does a little leak in my house really waste water?; EPA WaterSense Statistics and Facts
England Plumbing Leak Trends and Reported Network Leakage
England’s E8a series measures regulator-reported water-industry leakage in million litres per day. It describes distribution-system losses, not the household leak prevalence or household volumes measured in North American studies.
| Reporting year | Leakage, million litres per day |
|---|---|
| 2005/06 | 3,341.2 |
| 2010/11 | 3,155.55 |
| 2015/16 | 2,894.98 |
| 2019/20 | 2,771.29 |
| 2020/21 | 2,828.2455 |
| 2021/22 | 2,754.825 |
| 2022/23 | 2,790.34 |
| 2023/24 | 2,689.16 |
| 2024/25 | 2,617.4137 |
The complete reported series was 3,206.87 million litres per day in 2006/07, 3,078.42 in 2007/08, 3,087.74 in 2008/09, 3,084.3 in 2009/10, 2,948.57 in 2011/12, 2,962.12 in 2012/13, 2,915.07 in 2013/14, 2,940.77 in 2014/15, 2,918.07 in 2016/17, 2,986.5 in 2017/18, and 2,969.25 in 2018/19. It then reached 2,828.2455 in 2020/21, 2,754.825 in 2021/22, 2,790.34 in 2022/23, 2,689.16 in 2023/24, and 2,617.4137 in 2024/25.
The 2024/25 England water-industry report separately says household consumption was 59% of distribution input and leakage was 19%. Those percentages are an industry water balance, not a household plumbing-leak rate.
Source: E8a: Water leakage in England, 2005/2006 to 2024/2025; Water resources 2024 to 2025: analysis of the water industry’s annual water resources performance
Water-Use Trends and Leak-Related Efficiency Outcomes
The REUW snapshots provide wider indoor-water context. They show changes in end-use consumption alongside leakage, but they do not isolate the effect of plumbing-leak repairs.
| End use | REUW1999 | REUW2016 |
|---|---|---|
| Total indoor use | 69.3 gal/person/day | 58.6 gal/person/day |
| Toilet use | 18.5 gal/person/day | 14.2 gal/person/day |
| Clothes washer | 15.0 gal/person/day | 9.6 gal/person/day |
| Shower | 11.6 gal/person/day | 11.1 gal/person/day |
| Faucet | 10.9 gal/person/day | 11.1 gal/person/day |
| Bath | 1.2 gal/person/day | 1.5 gal/person/day |
| Dishwasher | 1.0 gal/person/day | 0.7 gal/person/day |
EPA reports the overall change as a 15.4% decrease in residential per-capita indoor use between the two study snapshots. It also reports that high-efficiency new homes in the cited 2011 study averaged 36.7 gallons per person per day indoors, described as 37% more water-efficient than the REUW2016 North American homes surveyed; that cross-study comparison concerns indoor use, not leak rate alone.
EPA’s fixture-efficiency estimates provide additional outcome measures, but they are not leak-only savings. Replacing all old inefficient toilets with WaterSense models was estimated to save an average family 13,000 gallons per year; replacing old bathroom faucets and aerators was estimated to save $250 over the faucets’ lifetime in combined water and electricity savings; and replacing showerheads was estimated to save more than 2,700 gallons per year, equivalent to 88 laundry loads.
Source: WaterSense Draft Specification for Homes Supporting Statement; EPA WaterSense Statistics and Facts