Old lead paint at home: what the evidence says about cancer

This page is for people living in, buying, or renting an older home who want to know if lead paint can cause cancer. It weighs what EPA says against the harms of lead that are certain.

EPA has treated lead as a probable human carcinogen. It says that under newer guidelines, lead would likely be labeled as "likely to be carcinogenic to humans."

That sounds definite, until you read the next part. Animal studies found kidney tumors in rats and mice given lead by mouth. But human studies are inconclusive about lead exposure and a higher cancer risk.

So the label rests mostly on animal data. In people, the question is not settled.

A "probable" label is not the same as proven cancer risk in people. When animal studies show tumors and human data stay unclear, a regulator may still classify a substance with caution. EPA itself calls the human studies inconclusive. This page does the same.

EPA says lead-based paints were commonly used until 1978. It adds that flaking paint, paint chips, and weathered paint powder may be a major source of lead exposure, particularly for children. So the age of a building is the first thing to check.

EPA lists other sources too. The largest airborne emissions now come from metals industries, including lead smelters and iron and steel production, manufacturing industries, and waste incineration. Exposure can also come from food and soil, and lead in drinking water is mainly due to lead in certain older pipes, solder, and fixtures. Workplaces such as mining, smelting, steel and iron factories, and battery plants are another route.

Here is a key point. EPA says lead-based paint in good shape is usually not a problem. Old or worn paint can produce chips and dust that become a hazard when breathed in or swallowed. EPA also notes that children are at particular risk because they commonly put hands, toys, and other items in their mouths, which may come into contact with lead-containing dust and dirt.

This is the part that should actually guide your decisions.

EPA reports effects on the blood, the kidneys, and the nervous, immune, and cardiovascular systems. Children are particularly vulnerable to lead's effects on the nervous system. EPA links low-level exposure early in life to effects on IQ, learning, memory, and behavior. Exposure during pregnancy has been associated with preterm delivery, low birthweight, and impaired mental development. In male lead workers, studies have reported severe depression of sperm count.

The case for taking lead paint seriously does not depend on the cancer question at all.

That reframe matters, because the cancer question is the uncertain one. The nerve-and-organ question is not. A family deciding whether to fix flaking paint in a pre-1978 house has more than enough reason, without bringing cancer into it.

Find out when your home was built. Before 1978 puts lead paint in the picture. After that, much less so.

Take renovation seriously. EPA says renovation work on homes built before 1978 must be done by people certified and trained in lead-safe work practices, and it advises owners to hire a lead-safe certified contractor rather than remove lead paint themselves.

Ask about blood lead testing, especially for young children in older housing. CDC says a blood lead test is the best way to find out whether a child has been exposed to lead. CDC also says there is no safe level of lead in the blood.

Check the other paths too: pipes, soil near the house, and work clothes coming home from a job that involves lead.

If you came here worried your old house is giving your family cancer, the evidence does not back that fear the way you might expect. What it does support is fixing deteriorating lead paint soon, because of harms that are far more certain. CDC says the effects of lead poisoning can be permanent.

Tenants in older buildings often have the least control over peeling paint and the most exposure to it. EPA says that if you rent a pre-1978 home, your landlord or property manager must follow the lead-safe renovation rule when work disturbs paint. EPA also points to real estate disclosure rules about lead hazards.

If you rent and see flaking paint, put your request in writing and keep a copy. A written record turns a conversation into a repair. It also proves when you first raised the problem.

EPA, Lead Compounds Hazard Summary; EPA, Learn About Lead; EPA, Protect Your Family from Sources of Lead; CDC, Childhood Lead Poisoning Prevention.