Any home built before 1978 may contain lead-based paint. That year, the federal government banned lead paint for consumer use in residential buildings, though some states banned it even earlier. The older the home, the higher the likelihood: houses built before 1940 have the greatest chance of containing lead paint, and the paint in those homes tends to have higher lead concentrations. Roughly 87% of homes built before 1940 contain some lead-based paint, compared to about 24% of those built between 1960 and 1977.
Why 1978 Is the Cutoff
Lead was a common ingredient in house paint for most of the 20th century. It made paint more durable, faster-drying, and resistant to moisture. By the 1970s, the health dangers were well established, and the federal government phased out lead in residential paint entirely by 1978. Any home built after that date should be free of lead-based paint, unless someone applied old stock or industrial paint not intended for homes.
The age of your home is the single most important risk factor. But the decade matters too. Homes from the 1940s through 1960s often have multiple layers of lead paint built up over decades of repainting. Homes from the early to mid-1970s are less likely to contain lead paint, and when they do, the concentration is typically lower because manufacturers had already begun reducing lead content in anticipation of the ban.
Where Lead Paint Hides in a Home
Lead paint can be on virtually any painted surface, but certain areas are more concerning than others. The CDC identifies windows, doors, floors, porches, stairways, and cabinets as common spots where lead dust accumulates. Friction surfaces, places where painted parts rub together like window tracks and door edges, are especially problematic because the repeated motion grinds paint into fine dust.
Windowsills are a particular hotspot. Every time you open or close an older window, the motion can release invisible lead dust that settles on the sill and surrounding floor. Children can also be exposed by chewing on painted surfaces like windowsills and door edges, which is why homes with young children warrant extra caution. Exterior surfaces like siding, railings, and trim are also common locations, and deteriorating exterior paint can contaminate the soil around a home’s foundation.
How to Tell If Your Home Has Lead Paint
You cannot identify lead paint by looking at it. It doesn’t have a distinctive color, texture, or smell. Chipping, peeling, or chalking paint in an older home should raise concern, but intact lead paint can also create dust through normal wear on friction surfaces.
There are three main ways to find out:
- EPA-recognized test kits. The EPA recognizes three test kits: LeadCheck, D-Lead, and the Massachusetts state kit. These use a chemical swab that changes color when lead is present. They work on wood, metal, drywall, and plaster surfaces. However, the EPA only considers results reliable when the kits are used by certified professionals, not homeowners. A negative result from a trained renovator can confirm lead paint is absent, but a positive result or a homeowner-administered test should be followed up with professional testing.
- Paint chip lab analysis. You can send a chip of paint to a lab certified under the National Lead Laboratory Accreditation Program. This gives you a precise measurement of lead content rather than a simple yes-or-no.
- Certified inspector or risk assessor. This is the most thorough option. A certified lead inspector uses a portable X-ray fluorescence device that can read lead levels through multiple layers of paint without disturbing the surface. A risk assessor goes further, evaluating not just whether lead paint exists but whether it’s creating an active hazard through dust, deterioration, or soil contamination.
What Sellers and Landlords Must Disclose
Federal law requires anyone selling or renting a home built before 1978 to disclose what they know about lead paint. Before you sign a contract or lease, the seller or landlord must share any known information about lead-based paint in the property, provide all available reports or test results, and give you a copy of the EPA’s “Protect Your Family From Lead in Your Home” pamphlet.
Homebuyers also get a 10-day window to conduct their own lead inspection or risk assessment before finalizing the purchase. You can negotiate a longer or shorter period in writing, or waive the inspection entirely, though waiving it in a pre-1940 home is a significant gamble. Sellers and landlords must keep signed copies of these disclosures for three years. The law doesn’t require them to test for lead or remove it. It only requires them to tell you what they already know.
Rules for Renovation Work
If you’re planning any renovation, repair, or painting work in a pre-1978 home, federal regulations under the EPA’s Renovation, Repair, and Painting (RRP) Rule apply. Contractors must be certified by the EPA, and at least one certified renovator must be present during the work. This person is responsible for determining whether lead paint is present and ensuring lead-safe work practices are followed throughout the project.
A certified renovator can use an EPA-recognized test kit, send paint chips to a lab, hire a certified inspector, or simply assume lead is present and follow lead-safe practices. Many contractors choose to assume lead is present rather than test, because the safe work practices (containing dust, sealing off work areas, cleaning up thoroughly) add relatively little cost compared to the liability of getting it wrong. If you’re hiring someone to work on a pre-1978 home and they don’t mention lead paint, that’s a red flag. Ask for their EPA certification number.
Why Lead Paint Still Matters
Lead is a neurotoxin with no known safe level of exposure. The CDC’s current blood lead reference value for children is 3.5 micrograms per deciliter, updated in 2021 from the previous threshold of 5. About 2.5% of U.S. children ages 1 to 5 have blood lead levels at or above that mark. Even amounts below the reference value can affect a child’s developing brain, impacting learning, attention, and behavior.
The primary route of exposure from paint isn’t eating paint chips, though that does happen. It’s lead dust. Tiny particles generated by friction on windows and doors, or by renovation work that disturbs painted surfaces, settle on floors and objects where young children crawl and put things in their mouths. Keeping windowsills and floors clean in older homes, using wet-mopping instead of sweeping, and addressing peeling or deteriorating paint are practical steps that reduce this dust exposure significantly.