Lead

The Romans added lead to wine as a sweetener and used lead pipes throughout their plumbing systems — some historians argue chronic lead poisoning contributed to the decline of the Roman elite [1]. In modern times, two decisions define lead's toxic legacy: adding it to gasoline (1922) and paint (widespread through 1978). By the time unleaded gasoline was mandated in the US in 1996, decades of exhaust had deposited lead into roadside soil that persists today [2]. Lead paint in homes built before 1978 — still present in roughly 25 million American residences — chips, flakes, and turns to dust during renovation, creating invisible hazards on floors, windowsills, and soil [3]. The Flint, Michigan water crisis (2014-2019) brought a third pathway to national attention: old lead service lines and lead solder in plumbing leach into drinking water, particularly when water chemistry changes. An estimated 6 million lead service lines remain in US water systems today [4].

Paint dust and chips in pre-1978 homes is the leading source for children — activities as ordinary as opening a painted window can generate lead dust [1]. Soil near old homes, roadways, orchards sprayed with lead arsenate pesticides, and former industrial sites retains lead for centuries; kids who play outside and put hands in mouths absorb it readily. Drinking water is the source most people underestimate: corrosive water eats lead from pipes and brass fixtures, and boiling does not remove it [2]. Lead also enters through imported ceramics, vinyl mini-blinds (pre-1997), some traditional folk remedies, and certain imported candies with lead-based wrappers. Adults face occupational exposure in battery recycling, radiator repair, construction involving painted surfaces, and shooting ranges where lead bullet fragments and residue accumulate in the air [3].

Lead mimics calcium, inserting itself into bones, teeth, and the brain wherever calcium would normally go [1]. In children, this disrupts the developing nervous system: each 10 µg/dL rise in blood lead is associated with a 1–5 point IQ reduction, impaired attention, and increased risk of ADHD and delinquent behavior in later years. These effects are irreversible — there is no treatment that restores lost cognitive function. In adults, lead accumulates in bone for decades and re-releases into the bloodstream during pregnancy, menopause, and osteoporosis, meaning past exposures haunt you later in life [2]. Chronic adult exposure raises blood pressure, damages kidneys, and increases risk of heart attack and stroke. Lead also causes miscarriage, stillbirth, and premature birth at elevated levels [3].

Children under six are at the highest risk because their brains are still developing, they absorb up to 50% of ingested lead (adults absorb about 10%), and hand-to-mouth behavior is constant [1]. Families in pre-1978 housing with deteriorating paint, crumbling plaster, or recent renovation are especially vulnerable. Pregnant women are at risk because lead stored in bones mobilizes during pregnancy. Workers in battery manufacturing, radiator repair, construction demolition, and shooting ranges face the highest occupational exposures [2]. Communities of color and low-income communities face disproportionate lead burden due to older housing stock and proximity to industrial sites.

Test your home's paint and soil if it was built before 1978 — EPA-certified lead inspectors can identify hazards [1]. Run cold water for 30–60 seconds before using it for drinking or cooking, especially after any period of non-use; use a certified lead-reducing filter (NSF/ANSI Standard 53) on your kitchen tap. Never dry-sand or heat painted surfaces in older homes — always use wet methods and an N100 respirator during renovation [2]. Have your children's blood tested: the CDC recommends testing at ages 1 and 2 for children in at-risk homes. Feed children iron- and calcium-rich diets, as good nutrition reduces lead absorption. Remove shoes at the door to keep lead-contaminated soil out. If you shoot at a range, shower and change clothes immediately afterward [3].