Conscious Home Design reference
Healthy Home Statistics: 7 U.S. Facts for 2026
Useful numbers for homeowners, writers, and design professionals thinking about the air, water, and everyday conditions inside a home.
Last updated July 28, 2026. Every fact below links to its primary public source.
What this covers
A healthier home starts with the unglamorous basics.
Fresh air, water management, radon testing, and combustion safety are easy to overlook when a project begins with finishes and floor plans. These figures give that conversation a clearer starting point.
They are not medical advice or a diagnosis. They are a practical reminder to bring the right questions to your architect, builder, inspector, HVAC professional, or health provider.
of time is spent indoors
Americans spend approximately 90 percent of their time indoors, making the conditions inside a home part of daily life rather than an occasional concern.
U.S. Environmental Protection Agency, updated May 2026higher indoor pollutant levels are possible
The EPA says concentrations of some pollutants are often two to five times higher indoors than typical outdoor concentrations.
U.S. Environmental Protection Agency, updated May 2026U.S. homes have elevated radon
The EPA estimates that nearly one out of every 15 homes has a radon level at or above 4 pCi/L. Testing is the only way to know a particular home's level.
U.S. Environmental Protection Agency, revised March 2024is the EPA's radon action level
The EPA recommends fixing a home when a radon test reaches 4 picocuries per liter or higher, and considering a fix between 2 and 4 pCi/L.
U.S. Environmental Protection Agency, updated November 2025people in the U.S. had current asthma
CDC's 2023 estimate includes 4.8 million children and 23.0 million adults. A well-planned home cannot replace medical care, but it can help households think through moisture, ventilation, filtration, and triggers with the right professionals.
Centers for Disease Control and Prevention, 2023 data; updated June 2026annual U.S. deaths from unintentional carbon monoxide poisoning
CDC also reports more than 100,000 emergency department visits and more than 14,000 hospitalizations each year from unintentional carbon monoxide poisoning not linked to fires.
Centers for Disease Control and Prevention, updated January 2026of U.S. homes have easy-to-fix major leaks
The EPA says these leaks can drip away 90 gallons of water or more each day. Early attention to drainage, plumbing, and moisture management protects both the home and the routines inside it.
U.S. Environmental Protection Agency, updated June 2026Method and sources
Built for accurate quoting, not sweeping claims.
This page uses public information from the U.S. Environmental Protection Agency and the Centers for Disease Control and Prevention. Each statistic keeps its source date beside the claim so readers can check the original context.
Data points are selected because they relate directly to the decisions a homeowner can raise early: moisture, ventilation, indoor air, radon, combustion safety, and maintenance. This page will be reviewed monthly and refreshed when a primary source changes.
Cite this page
Conscious Home Design. “Healthy Home Statistics: 7 U.S. Facts for 2026.” Updated July 28, 2026. https://conscioushomedesign.com/healthy-home-statistics
Put the facts to work
Turn healthy-home questions into a better plan.
Explore the practical design choices that shape moisture, fresh air, rest, nourishment, and everyday comfort before a project becomes expensive to change.