Plumbing research and data
Three datasets are worth knowing as a homeowner. The EPA estimates household leaks waste nearly 1 trillion gallons nationwide each year, averaging over 9,300 gallons per home. The Insurance Information Institute reports water damage and freezing claims affect about one in 60 insured homes annually, averaging roughly $13,954 across 2018-2022. And EPA's 2024 Lead and Copper Rule Improvements requires water systems to identify and replace lead service lines on a 10-year timeline.
The leak numbers reframe what "small" means. A single faucet at one drip per second wastes more than 3,000 gallons a year. About 9% of homes have leaks losing more than 50 gallons a day. That's why the EPA's free two-hour meter test is the highest-return thing in this entire section.
The insurance data explains why plumbing decisions deserve more caution than their sticker price suggests. Water damage and freezing is the second most frequent homeowners loss category after wind and hail. The cost of the plumbing failure is almost never the cost of the plumbing.
On lead: EPA finalized the Lead and Copper Rule Improvements on October 8, 2024, requiring systems to identify and replace lead pipes within a 10-year timeline, with more rigorous testing and a lower action level. The current national primary drinking water regulation lists a lead action level of 0.010 mg/L. What this means for your specific address depends on your water system's service line inventory - your utility is required to communicate about lead pipes in its system, and its annual Consumer Confidence Report is the place to start.
Be careful with statistics you see quoted in contractor marketing. Numbers about "the average home" are national and often several years old. They're useful for framing a decision. They are not evidence about your house.
Choosing plumbing what the data says
The judgement calls that decide the bill, before anyone quotes you.
- Use national data for framing, not diagnosis Statistics tell you what's worth checking. Only measurements at your address tell you what's actually happening.
- Read your utility's Consumer Confidence Report Community water systems must deliver one each year by July 1. It covers your actual water system, including lead education content.
- Check your utility's lead service line inventory Under the 2024 Lead and Copper Rule Improvements, systems must identify lead pipes and communicate with residents about them. Ask your utility what's recorded for your address.
- Distrust a statistic without a source If a contractor's presentation cites a percentage with no attribution, ask where it came from. Often there's no answer.
All plumbing research
Plumbing Cost Index
Pipe Era Risk by Housing Age
Water Heater Failure Report
Where these figures come from
Sources last checked
- EPA WaterSense - Fix a Leak Week · retrieved 2026-07-25
- Insurance Information Institute - Facts + Statistics: Homeowners and Renters Insurance · retrieved 2026-07-25
- EPA - Lead and Copper Rule Improvements · retrieved 2026-07-25
- EPA - National Primary Drinking Water Regulations · retrieved 2026-07-25
- EPA - CCR Information for Consumers · retrieved 2026-07-25
You know more than the last homeowner they quoted.
That is worth something only while you are still choosing. Tell us what is going on and we will match you with a few plumbing pros whose licence and insurance we have already checked - free, no obligation.
Free · No pressure · Only your matched pros get your details