Greta Jimenez
Lead is a naturally occurring toxic metal found throughout the Earth's crust. It has been used in a variety of products, including gasoline, paint, plumbing pipes, ceramics, solders, batteries, and even cosmetics. Lead pollution is found in the environment, water, and food. It is also present in the air near lead smelters and can be released from certain household items, such as imported candies and vinyl mini blinds. Lead exposure can have serious health consequences, especially for children, affecting their brain development and causing a range of health issues in both children and adults.
| Characteristics | Values |
|---|---|
| Sources of lead pollution | Ore and metals processing, piston-engine aircraft operating on leaded aviation fuel, waste incinerators, utilities, lead-acid battery manufacturers, mining, smelting, manufacturing, recycling activities, lead paint, plumbing pipes, ceramics, solders, cosmetics, food and spices, drinking water, soil, air |
| Health effects | Reduced intelligence quotient (IQ), behavioural changes, reduced educational attainment, anaemia, hypertension, renal impairment, immunotoxicity, adverse effects on the reproductive system, cardiovascular effects, nerve disorders, decreased kidney function, fertility problems, psychiatric disorders, substance abuse, permanent intellectual disability, behavioural disorders, coma, convulsions, death |
| Groups at risk | Children, pregnant women, malnourished children, African-American children, people working in mining, ironwork or welding, construction, smelters, shooting ranges, battery manufacturing, automobile radiator repair, pottery manufacturing, stained glass manufacturing, people who have recently travelled to other countries |
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What You'll Learn
Lead in drinking water
Lead is a naturally occurring toxic metal found in the Earth's crust. It is persistent in the environment and can contaminate drinking water through plumbing systems containing lead pipes, solders, and fittings. Lead was commonly used in the past to make plumbing materials, and older cities and homes built before 1986 are more likely to have lead pipes.
The most common sources of lead in drinking water are lead pipes, faucets, and fixtures. In homes with lead pipes that connect the home to the water main, also known as lead service lines, these pipes are typically the most significant source of lead in the water. Lead can enter drinking water when plumbing materials containing lead corrode, especially in water with high acidity or low mineral content. Corrosion is a process where metal dissolves or wears away due to a chemical reaction with water.
The presence of lead in drinking water can have serious health consequences, especially for children and pregnant women. Young children are particularly vulnerable to the toxic effects of lead, which can adversely affect their central nervous system and brain development, leading to reduced intelligence quotient (IQ), behavioural changes, and impaired learning abilities. Even low levels of lead exposure can have detrimental effects on children, and there is no known safe level of lead in a child's blood.
To reduce exposure to lead in drinking water, several precautions can be taken. It is recommended to use cold water for drinking, cooking, and making baby formula, as boiling water does not remove lead. Regular cleaning of the faucet's screen, also known as an aerator, is important as lead particles can collect in this area. Using a certified water filter that removes lead is also advised. Homeowners can test for lead in their water using lead test kits and take necessary measures such as replacing lead pipes and plumbing fixtures to mitigate the issue.
While lead in drinking water is not a prevalent source of lead poisoning compared to other sources, it is crucial to be aware of its potential presence and take the necessary steps to minimize exposure, particularly for vulnerable populations such as children and pregnant women.
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Lead in paint
Lead is a highly toxic metal that may cause a range of health problems, especially in young children. Lead-based paints were banned for residential use in 1978. However, homes built before 1978 are likely to contain lead-based paint. When the paint peels and cracks, it creates lead paint chips and dust. Lead dust is common in many areas, including windows, doors, floors, porches, stairways, and cabinets. Children can be exposed to lead if they chew on surfaces coated with lead-based paint, such as windowsills and door edges, or if they eat flaking paint chips or inhale lead dust.
Approximately 29 million housing units in the United States have lead-based paint hazards, including deteriorated paint and lead-contaminated house dust. Lead paint is a major source of exposure globally, and the World Health Organization (WHO) and the United Nations Environment Programme (UNEP) lead the Global Alliance to Eliminate Lead Paint. As of January 2024, 48% of countries have legally binding controls on lead paint.
If you suspect lead-based paint in your home, you should have it removed by qualified professionals. Common renovation activities, such as sanding and cutting, can create hazardous lead dust, so it is important to use contractors certified by the U.S. Environmental Protection Agency (EPA) and keep children and pregnant women away from the work area. You can also apply temporary barriers, such as contact paper or duct tape, to cover holes in walls or block children's access to sources of lead.
In addition to paint, lead can contaminate drinking water through plumbing systems containing lead pipes, solders, and fittings. Lead may also be found in imported candies, the wrappers of some imported candies, and certain types of tableware, such as leaded crystal, pewter, and brass dishware, and folk terracotta plates and bowls from Latin America. Acidic foods or drinks may cause lead to be drawn out of these materials and contaminate the food or drink.
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Lead in soil
Lead is a naturally occurring toxic metal found in the Earth's crust. Its widespread use has led to extensive environmental contamination, human exposure, and significant public health problems worldwide. Lead is persistent in the environment and can be introduced into the soil through deposition from sources of lead air pollution. Other sources of lead in ecosystems include direct discharge of waste streams into bodies of water and mining. Lead in soil is a significant health hazard, especially for children, who are highly vulnerable to the toxic effects of lead.
Children can be exposed to lead in soil by swallowing or breathing in lead-contaminated soil while playing. Lead-contaminated soil particles can be brought indoors as lead dust or on shoes, clothing, or pets. Young children often put their hands in their mouths, and they may have lead dust on their hands from playing in contaminated soil. Some children also eat soil, a behaviour known as pica. In addition, children may be exposed to lead by consuming fruits and vegetables grown in or near contaminated soil.
Deposits from leaded gasoline, exterior lead-based paint, and industrial sources have contributed to elevated levels of lead in the soil. This is particularly common in urban areas and older homes built before 1978. About 75% of homes constructed before 1978 contain some lead-based paint. Lead paint is a significant source of exposure globally, and organisations like WHO and UNEP are working to encourage countries to develop legally binding laws to control lead usage in paint.
To reduce the risk of lead exposure from soil, it is recommended to avoid contact with bare soil, especially for children. Covering bare soil with grass, mulch, wood chips, or other ground covers can help prevent exposure. Additionally, it is essential to plant gardens away from buildings with chipping or peeling paint, as they may contain lead. If planting in potentially contaminated areas is necessary, it is advised to till the soil, cover it with uncontaminated soil, and thoroughly wash any produce grown in these areas.
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Lead in food and drink
Lead can be found in food and water supplies, with the potential to cause serious health issues, particularly in children. Lead enters drinking water supplies primarily through the corrosion of materials containing lead in the water distribution system and household or building plumbing. Lead pipes, solder used to join copper pipes, brass and chrome-plated brass faucets, and pipes connecting houses to water mains can all contribute to lead contamination. The FDA has set a limit of 5 parts per billion (ppb) for lead in bottled water, below the 15 ppb allowed by the US Environmental Protection Agency for public drinking water.
Soil can also be a source of lead contamination in food. This can occur due to deteriorated exterior paint on buildings or fences, or from past use of leaded gasoline near major roadways or intersections. Children are at risk of ingesting lead by playing in these areas or eating outside on bare soil. Lead can also enter the food chain through the environment where foods are grown, raised, or processed. The levels of lead in the environment can vary depending on the natural geographical composition and proximity to current or past manufacturing processes that utilise lead.
Some specific food items that may contain lead include imported candies, with certain ingredients such as chilli powder and tamarind potentially being sources of lead exposure. Plastic or paper candy wrappers can also contain lead that can leach into the candy. Lead has also been found in spices imported from Vietnam, India, Syria, and other countries. Additionally, traditional medicines, cosmetics, and cultural remedies can contain lead. For example, "sindoor," a red powder used by Hindu and Sikh women, has been found to contain high levels of lead.
It is important to note that lead contamination in food and water cannot always be detected by appearance or taste. Consuming even small amounts of lead can be harmful, and lead poisoning can cause serious health issues, especially in children. The FDA works to limit consumer exposure to lead and protect vulnerable populations through developing regulations and providing educational information.
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Lead in the air
Lead is a naturally occurring toxic metal found throughout the Earth's crust. It has been used in a wide variety of products, including gasoline, paint, plumbing pipes, ceramics, solders, batteries, and even cosmetics. Due to its widespread use, lead has caused extensive environmental contamination, human exposure, and significant public health problems worldwide.
Soil contaminated with lead can be a source of lead in the air. This contamination can occur when old lead-based paint from buildings flakes off and mixes with the soil. Before the elimination of lead in gasoline, lead from car exhaust mixed with soil near roads, and this contamination still remains. Additionally, lead from mining activities can be added to soils and sediments through deposition, further contributing to lead pollution in the air.
Another source of lead exposure is through lead-contaminated drinking water, which usually comes from distribution lines, household plumbing, or plumbing systems containing lead pipes, solders, and fittings. Lead can also be found in certain foods and spices, although it is not legal to add lead to food sold in the United States. Imported candies, in particular, have been found to contain lead in their wrappers, and lead may be drawn out of ceramic glazes into food or drinks, especially when acidic.
The health effects of lead exposure are well-documented. Lead can be distributed throughout the body, accumulating in the bones and teeth over time. Children are particularly vulnerable to the toxic effects of lead, with serious consequences for their health and development. Lead exposure can cause reduced intelligence, behavioural changes, anaemia, hypertension, renal impairment, immunotoxicity, and reproductive organ toxicity. In adults, elevated blood lead levels are associated with cardiovascular effects, nerve disorders, decreased kidney function, and fertility problems.
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Frequently asked questions
Lead pollution can be found in the home in old paint dust, plumbing pipes, and ceramic dishware. Lead may also be found in drinking water, which usually comes from water distribution lines or household plumbing.
Lead pollution can be found in the environment in soil, air, and water. Soil can be contaminated with lead from exterior paint on buildings or fences, and lead from car exhausts mixes with soil near roads. The highest air concentrations of lead are usually found near lead smelters. Water from lakes, rivers, or wells is not a common source of lead, but lead contamination in drinking water usually comes from distribution or plumbing lines that leach lead.
Lead pollution can be found in some imported candies, spices, and foods. It is also present in some traditional medicines and cosmetics, particularly those purchased from outside the United States. Lead may also be found in some ceramic glazes, pewter and brass dishware, and vinyl mini blinds.
