When I was a kid, my dad half-joked that the Roman Empire fell because the Romans used lead to make their pipes, thus poisoning their drinking water supply. Even at age 7, I found that one hard to believe.

But maybe, in some crucial ways, my dad was on to something. Strong evidence shows that lead is a uniquely toxic substance that can wreak permanent and devastating changes on both the human brain and a human life. Lead is also still ubiquitous in the U.S.

Like the Romans, the U.S. uses lead to supply water — about a third of all U.S. water systems use lead pipes. And until just a few years ago, plumbing fixtures containing as much as 8 percent lead could be sold as “lead-free.” When those pipes become corroded, as they often do, people start consuming lead. And don’t be misled by the photos of brownish-yellow water coming out of pipes in the famously lead-contaminated city of Flint, Michigan — lead in drinking water is generally colorless, tasteless and odorless.

People are breathing and eating lead too. Many houses built before 1978 have lead paint in them, sometimes buried under more recent coats of paint. When the old lead paint chips, cracks, crumbles or gets eroded by water, lead particles are released, and gets swallowed and inhaled by kids. Even worse, the lead dust often gets into the soil, where it can get into garden plants, kids play in it, and it can even contaminate local water supplies.

When kids ingest lead, it gets stored in their bones, kidneys, liver and brains. It’s the last of these that is particularly insidious. Scientists continue to find ways that lead damages brain function, but that doesn’t explain exactly how the brain damage will contribute to altered behavior and consciousness. The only way to determine that is to examine the behavior of children who were exposed to lead (since children are more susceptible to the metal’s effects). Kids with high levels of lead in their blood do worse on tests, have trouble paying attention and do poorly in a number of other visible ways.

In the past, only children with blood-lead concentrations of 10 micrograms per deciliter were considered exposed to lead. But a number of studies from around the world have shown that even lower levels can have major deleterious effects on brain function. So even though official levels of lead poisoning have gone down substantially in rich countries — especially after the banning of leaded gasoline — there are still probably a very large number of American children whose personalities and cognitive capacities are being altered.

Perhaps the worst consequence of this silent brain damage is crime. Mother Jones writer Kevin Drum has been tireless in collating the vast pile of evidence regarding the link. Much of the research focuses on making sure that it’s not poverty or other social factors causing the correlation between lead and crime.

For example, a 2018 paper by Anna Aizer and Janet Currie use the banning of leaded gasoline, together with families’ proximity to roads, to estimate the effect of lead on school suspensions and juvenile detention in Rhode Island, while looking at differences between siblings to control for family disadvantage. They find that when blood lead falls by 1 microgram per deciliter, the probability of a boy being sent to juvenile detention falls by a jaw-dropping 27 to 74 percent. The biggest effects were for poor African American boys. Most of these students had blood lead levels well below the official cutoff for lead poisoning, showing the destructive effects of even small amounts of the metal.

A 2019 paper by economists Stephen Billings and Kevin Schnepel addresses the question from another important angle. The authors identify lead-poisoned children who were eligible for interventions, including blood lead reduction, in Charlotte, North Carolina, and compared them with children who just missed the cutoff for intervention. Tracking the kids throughout their lives, they find much lower crime rates among those who had received the interventions.

These are only two particularly well-done studies amid a growing mountain of evidence on the link between lead and crime. This evidence suggests that cleaning up lead paint, replacing lead pipes, and removing lead from soil could have major beneficial effects for those cities still wracked by high levels of violence.

So far, lead cleanup hasn’t been a central issue for most of the Democratic presidential candidates. An exception is Texas’ Julian Castro, who has released a comprehensive and detailed plan for lead remediation, detection and treatment throughout the U.S. The plan, which would cost only $5 billion a year for 10 years — a tiny percentage of the federal budget — could do a lot to reduce the country’s still-high levels of violence, crime, school delinquency and other form of social pathology. Hopefully other candidates will soon follow suit with plans of their own.

Lead poisoning may not send the U.S. down the path of ancient Rome. But just in case, we should clean up all the lead.

Smith is a Bloomberg Opinion columnist. He was an assistant professor of finance at Stony Brook University, and he blogs at Noahpinion.

(10) comments


Working as a plumber, I remember connecting copper pipes to each other, using solder.  It was a common practice before 1980.  We also used copper on 4" soil pipe by tamping oakum into the joints and pouring lead around the joint.  Of course, that would not get into your drinking water, but the copper pipes were used for drinking water.  "Nearly all homes built before the 1980s still have lead solder connecting copper pipes." Here is a good site on lead and it's use in plumbing: https://www.safeplumbing.org/advocacy/health-safety/lead-in-plumbing


We got the lead out of our paint and gasoline! Now is time to clean up the mind poison in the rest of our country.


"Half-joked?" Lead has never been a joke. The pipes in question are from the water line and most are in the homes of those affected. If it is serious they should replace the pipes or use filters. Perhaps the government can aid the process with loans, but it is their homes they need to improve.


Cleaning up something we have been living with for centuries sounds expensive and likely to eat into profits. Gotta go with a hard "No" on this.


Wonder how much lead this one had accumulated.


None. Due to careful planning I made sure I was born into an economic status that allows me to eschew the public water supply and drink Perrier exclusively. I'm not dumb.


Is Perrier water good for you? https://www.newhealthadvisor.com/Is-Perrier-bad-for-you.htmlMore Healthy Bottled Water You Can TryIs Perrier bad for you? No, and neither are these other brands of mineral water, which all have unique mineral compositions: 1. Evian Natural Spring WaterEvian is taken from the Source Cache in France and is thought to have healing and restorative powers. The water comes from melted snow and rain filtered through glacial sand and protected by clay, giving it its unique taste and mineral content. 2. FIJI Natural Artesian Water The number one brand of bottled water in the United States, FIJI comes from the Yaqara Valley and contains silica, calcium, and magnesium. The quality of FIJI water is ensured by the fact that no human hands are allowed to touch it until you open your bottle. 3. Gerolsteiner Mineral WaterGerolsteiner is the number one brand in Germany and comes from the Volcanic Eifel area. Because this water is taken from 200 feet below the surface of the earth, it is rich in magnesium, calcium, and bicarbonate and has a unique refreshing taste. 4. Ferrarelle Naturally Sparkling Mineral WaterFerrarelle is Italy's number one brand of water and comes from the Campania region. Ferrarelle water is meticulously tested over 600 times daily to ensure its freshness and quality. Rich in potassium, fluoride, magnesium, and calcium, the water collects these minerals as it trickles through several layers of untouched rock. 5. San Pellegrino WaterSan Pellegrino is water that comes from the spring of the same name. Located in Milan, it is actually taken 1,3000 feet below ground, from three deep springs studded with limestone and volcanic rocks. These give its refreshing taste and special mineral composition.


Drink distilled water if you want it relatively contaminant free. It's also much cheaper than name brand "spring" water.


We had "outhouses" for ages, but few would save money on a new house to keep that "custom." Most will spend what it takes to make their house safe and convenient.


The Zero water system is a pain - $15 replacement filters for a clumsy pitcher - but it removes more contaminants than any other system and comes with a battery operated water tester. Fluoride you can get from toothpaste. When in doubt, or just for peace of mind, spend the initial $35 or so.

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