Preventing lead poisoning comes down to controlling a handful of known exposure sources: old paint, contaminated water, soil, and certain consumer products. Most cases in children trace back to lead dust from deteriorating paint in homes built before 1978, which means prevention starts at home and focuses on keeping lead out of your body through a combination of testing, cleaning, filtering, and smart renovation practices.
The CDC uses a blood lead reference value of 3.5 micrograms per deciliter to flag children whose levels are higher than most kids in the U.S. There is no safe level of lead exposure, so the goal is zero contact, not just staying under a threshold.
Know Whether Your Home Has Lead Paint
Any home built before 1978 may contain lead-based paint. The older the house, the more likely it is and the higher the lead concentration tends to be. Lead paint becomes dangerous when it deteriorates into dust or chips, especially on high-friction and high-contact surfaces: windows and window sills, doors and door frames, stairs, railings, banisters, and porches. A window that slides up and down grinds painted surfaces together every time it opens, generating fine dust you can’t see.
If you suspect lead paint, testing gives you a clear answer. DIY swab kits from hardware stores detect surface-level lead but can’t measure concentration and carry a real risk of false positives or false negatives. They’re useful as a rough screening step, but a negative swab result does not guarantee the absence of lead. Professional inspectors use X-ray fluorescence (XRF) scanners that detect lead beneath multiple paint layers and measure precise concentration levels. Professional testing is strongly recommended when children under six live in the home, when the building was constructed before 1978, or when you’re planning renovation or repainting.
Clean to Control Lead Dust
In a home with lead paint, regular cleaning is one of the most effective ongoing prevention measures. Lead dust settles on floors, window sills, and furniture where young children crawl, play, and put their hands in their mouths.
Wet cleaning is the key. A wet mop, cloth, or sponge with warm water and a general all-purpose cleaner picks up lead dust far better than dry sweeping, which just pushes it into the air. The EPA recommends wet washing floors and baseboards weekly. Window sills and window troughs deserve special attention since they collect the most dust from friction. Wipe them with a damp cloth, and if dust buildup is heavy, vacuum first with a HEPA-filtered vacuum before following up with wet wiping. Use the same approach on doors, door frames, walls, stairs, and railings.
Wipe air ducts and radiators monthly with a damp cloth. Dust furniture weekly with furniture polish, which traps particles instead of scattering them. For upholstered furniture like couches, use a HEPA vacuum or wet wash regularly. Standard vacuums without HEPA filters can actually blow lead dust back into the air through their exhaust, making the problem worse.
Filter Your Drinking Water
Lead enters drinking water primarily through old lead service lines, solder, and plumbing fixtures. You can’t see, taste, or smell it. Running the tap for 30 seconds to two minutes before drinking helps flush standing water that has absorbed lead from pipes, but filtering provides more reliable protection.
Not all water filters remove lead. Look for filters certified to NSF/ANSI Standard 53 for lead reduction. The packaging or performance data sheet should specifically state the filter has been tested against this standard. For extra protection, the EPA recommends also looking for NSF/ANSI Standard 42 certification for particulate reduction (Class I). The best filters reduce lead to 5 parts per billion or less. A certification mark from an accredited third-party testing body should appear on the packaging. If you don’t see lead reduction claims on the box, check the performance data sheet inside the packaging or on the manufacturer’s website.
Pitcher filters, faucet-mounted filters, and under-sink systems all come in certified versions. Replace filter cartridges on schedule, since an expired filter loses its effectiveness.
Address Contaminated Soil
Lead accumulates in soil near older homes from decades of exterior paint flaking off, and it doesn’t break down over time. Soil near busy roads can also carry lead deposited by leaded gasoline, which was phased out in the 1990s but left a lasting residue. The EPA’s safety standard for lead in bare soil is 400 parts per million in children’s play areas and 1,200 ppm in non-play areas.
If you’re concerned about your soil, you can get it tested through your local health department or cooperative extension service. In the meantime, practical steps reduce exposure significantly. Cover bare soil near your home’s foundation with grass, mulch, or ground cover. Set up children’s play areas, sandboxes, and gardens away from the house and away from roads. If you garden in potentially contaminated soil, raised beds filled with clean soil and compost are a simple solution. Have everyone remove shoes before entering the house to avoid tracking lead-contaminated dirt inside, and wash children’s hands after outdoor play.
Renovate Safely in Older Homes
Renovation is one of the most dangerous moments for lead exposure. Sanding, scraping, or demolishing surfaces with lead paint generates enormous amounts of dust and can contaminate an entire home in hours. Never dry-sand or dry-scrape paint in a pre-1978 home without knowing whether it contains lead.
Federal law requires contractors working on pre-1978 homes to be EPA-certified under the Renovation, Repair, and Painting (RRP) Rule. Certified renovators are trained in lead-safe work practices, including containing the work area with plastic sheeting, using HEPA vacuums and wet methods, and cleaning thoroughly afterward. If you hire a contractor, ask to see their RRP certification before work begins. If you’re doing small projects yourself, follow the same principles: mist surfaces before disturbing paint, lay plastic sheeting to catch debris, wet-clean the area when finished, and never use a heat gun above 1,100°F on lead paint.
Keep children and pregnant women out of the work area until cleanup is complete.
Watch for Lead in Consumer Products
Lead shows up in products you might not expect. Traditional pottery and ceramics, particularly handmade or imported pieces, can leach lead into food and drinks. The FDA has found that even some pottery from Mexico labeled “lead free” contained lead levels comparable to known lead-glazed products. Be cautious with ceramicware that is handmade with a crude or irregular appearance, antique, damaged or excessively worn, purchased from flea markets or street vendors, or brightly decorated in orange, red, or yellow (lead is sometimes used with these pigments to intensify color). Don’t use these items for food or drink storage.
Certain imported spices, candies, and traditional remedies have also tested positive for lead contamination. Cosmetics like kohl or surma, used in some cultural traditions, can contain high lead levels. Older toys and jewelry, especially imported items, may contain lead paint or lead metal. If a product doesn’t come from a well-known manufacturer or retailer, treat it with extra caution around children.
Protect Children Through Nutrition and Testing
Good nutrition doesn’t prevent lead from entering the body, but it does reduce how much the body absorbs. Children who get enough calcium and iron absorb less lead through their digestive tract. Foods rich in calcium (milk, yogurt, cheese, leafy greens) and iron (lean meats, beans, fortified cereals) make a meaningful difference, especially for children in older housing.
Regular hand washing is a simple and effective habit. Children touch contaminated surfaces and then put their hands in their mouths dozens of times a day. Wash their hands before meals, after playing outside, and after contact with pets that may have rolled in contaminated soil. Keep pacifiers and toys clean.
Blood lead testing is the only way to know if a child has been exposed, since most children with elevated levels show no symptoms. The CDC recommends testing at ages one and two, and the reference value that triggers follow-up is 3.5 micrograms per deciliter. At that level, clinicians will work with you to identify the exposure source and recommend follow-up testing. Many state Medicaid programs require lead testing for enrolled children, and your pediatrician can order the test regardless of insurance.
Reduce Workplace Lead Exposure
Adults who work with lead face a different set of risks. Construction workers, painters, plumbers, battery manufacturers, and those who work at firing ranges are among the most commonly exposed. OSHA standards require employers to remove workers from lead exposure when blood lead levels reach certain thresholds, but prevention should start well before that point.
If you work around lead, change out of work clothes and shoes before entering your home or car. Shower at work if possible. Wash work clothes separately from family laundry. These steps prevent “take-home” contamination, which is one of the most common ways children of industrial workers end up with elevated lead levels. Your employer is required to provide protective equipment, ventilation, and blood lead monitoring if your job involves lead exposure.