What is Lead?
Lead is a naturally occurring element found in small amounts in the earth’s crust. While it has some beneficial uses, it can be toxic to humans and animals causing of health effects.
Lead-based paint (LBP) is a surface coating that contains a certain amount of lead that is found in residential properties, school buildings, commercial buildings, industrial work sites, and many other places. Having LBP within a building does not mean that there is an immediate risk. While lead can cause a variety of serious health problems, it is only a problem when the painted surfaces are deteriorated or disturbed and reduced to a dust that can be either inhaled or ingested. Small children, pregnant women, and workers are most at risk of exposure to lead. In order to determine whether lead may be a problem or required by law to be inspected in any given building, there are different services that may be helpful:
• Lead Based Paint Inspections or Limited Paint Testing
• Lead Risk Assessments or Lead Combination Inspection/Risk Assessment
• Lead Clearance Testing
The older the building, the more likely that it has lead ...
- 90% of pre-1940 buildings have lead.
- 80% of pre-1960 and,
- 62% of pre-1978 buildings have lead.
Where is Lead Found?
Lead can be found in all parts of our environment – the air, the soil, the water, and even inside our homes. Much of our exposure comes from human activities including the use of fossil fuels including past use of leaded gasoline, some types of industrial facilities, and past use of lead-based paint in homes. Lead and lead compounds have been used in a wide variety of products found in and around our homes, including paint, ceramics, pipes and plumbing materials, solders, gasoline, batteries, ammunition, and cosmetics.
Lead may enter the environment from these past and current uses. Lead can also be emitted into the environment from industrial sources and contaminated sites, such as former lead smelters. While natural levels of lead in soil range between 50 and 400 parts per million, mining, smelting, and refining activities have resulted in substantial increases in lead levels in the environment, especially near mining and smelting sites.
When lead is released to the air from industrial sources or vehicles, it may travel long distances before settling to the ground, where it usually sticks to soil particles. Lead may move from soil into ground water depending on the type of lead compound and the characteristics of the soil.
Federal and state regulatory standards have helped to reduce the amount of lead in air, drinking water, soil, consumer products, food, and occupational settings.
Learn more about sources of lead exposure:
· At home
· In soil
· In dust
Who is at Risk?
Lead is particularly dangerous to children because their growing bodies absorb more lead than adults do and their brains and nervous systems are more sensitive to the damaging effects of lead. Babies and young children can also be more highly exposed to lead because they often put their hands and other objects that can have lead from dust or soil on them into their mouths. Children may also be exposed to lead by eating and drinking food or water containing lead or from dishes or glasses that contain lead, inhaling lead dust from lead-based paint or lead-contaminated soil or from playing with toys with lead paint.
Adults, Including Pregnant Women
Adults may be exposed to lead by eating and drinking food or water containing lead or from dishes or glasses that contain lead. They may also breath lead dust by spending time in areas where lead-based paint is deteriorating, and during renovation or repair work that disturbs painted surfaces in older homes and buildings. Working in a job or engaging in hobbies where lead is used, such as making stained glass, can increase exposure as can certain folk remedies containing lead. A pregnant woman’s exposure to lead from these sources is of particular concern because it can result in exposure to her developing baby.
Lead Exposure Data
The U.S. Centers for Disease Control and Prevention’s (CDC) National Center for Health Statistics monitors blood lead levels in the United States. Get information on the number of children with elevated blood lead levels, and number and percentage of children tested for lead in your area.
· The most important step parents, doctors, and others can take is to prevent lead exposure before it occurs.
· Until recently, children were identified as having a blood lead level of concern if the test result is 10 or more micrograms per deciliter of lead in blood. Experts now use a new level based on the U.S. population of children ages 1-5 years who are in the top 2.5% of children when tested for lead in their blood (when compared to children who are exposed to more lead than most children). Currently that is 5 micrograms per deciliter of lead in blood. The new, lower value means that more children likely will be identified as having lead exposure allowing parents, doctors, public health officials, and communities to take action earlier to reduce the child’s future exposure to lead.
EPA uses the CDC data to show trends on blood lead levels in children in America’s Children and the Environment.
The Health Effects of Lead
Lead can affect almost every organ and system in your body. Children six years old and younger are most susceptible to the effects of lead.
Even low levels of lead in the blood of children can result in:
· Behavior and learning problems
· Lower IQ and Hyperactivity
· Slowed growth
· Hearing Problems
In rare cases, ingestion of lead can cause seizures, coma and even death.
Lead can accumulate in our bodies over time, where it is stored in bones along with calcium. During pregnancy, lead is released from bones as maternal calcium and is used to help form the bones of the fetus. This is particularly true if a woman does not have enough dietary calcium. Lead can also cross the placental barrier exposing the fetus the lead. This can result in serious effects to the mother and her developing fetus, including:
· Reduced growth of the fetus
· Premature birth
Find out more about lead's effects on pregnancy:
· Effects of Workplace Hazards on Female Reproductive Health, National Institute for Occupational Safety and Health
Lead can also be transmitted through breast milk. Read more on lead exposure in pregnancy and lactating women (PDF) (302 pp, 4.2 MB, About PDF).
Lead is also harmful to other adults. Adults exposed to lead can suffer from:
· Cardiovascular effects, increased blood pressure and incidence of hypertension
· Decreased kidney function
· Reproductive problems (in both men and women)