How Lead Poisoning Changed The Personality Of A Generation
Consuming lead through the air, food, and water as children has an effect on people's personalities as adults, making them less agreeable and probably more neurotic. Image Credit: Lightspring/Shutterstock.com
Exposure to lead as a child doesn't just reduce intelligence and harm mental health as an adult, it also changes personality, an enormous study has found. The results are in keeping with previous discoveries about the effects of childhood lead exposure, but their implications are profound in light of the vast widespread low-level lead poisoning of a generation.
Lead is a neurotoxin, dangerous at almost any level. There is abundant evidence it can reduce lifetime IQ scores in those exposed as children. It has also been associated with lower impulse control and increased violence. Considerable research supports the idea that the rise in crime experienced in the industrialized world from the late 60s to the 90s, and the subsequent spectacular fall, was the consequence of putting lead in gasoline and then taking it out.
Dr Ted Schwaba, of the University of Texas, Austin, investigated whether lead exposure also influences adults' personalities on the “Big Five” personality traits. In Proceedings of the National Academy of Sciences, Schwaba used lead measurements in the childhood neighborhoods of 1.5 million people across America and Europe who took online personality tests.
“We take our personalities with us everywhere," Schwaba said in a statement. "Even a small negative effect of lead on personality traits, when you aggregate it across millions of people and all the daily decisions and behaviors that our personality influences, can have really massive effects on well-being, productivity and longevity." Moreover, Schwaba and co-authors note, modest lead-induced effects within the normal range of personality traits have only been explored in one small previous study.
Schwaba and co-authors found less healthy personalities among adult Americans who grew up in counties with high lead levels. On its own, this finding could be confounded by factors such as differences in urban and rural cultures. However, the Clean Air Act phasing out leaded petrol was not implemented with equal speed everywhere. Schwaba found that people born after lead concentrations in their county fell reaped a benefit not seen in counties that only got lead-free petrol later.
Data from Europe, where leaded petrol was phased out later, confirmed two of Schwabas three main findings. On both continents, lead exposure translated to greater neuroticism and lower agreeableness. However, it had an opposite association on conscientiousness, throwing into question whether the effect on this trait was real.
"These three traits … make up a large part of what we would consider a mature, psychologically healthy personality and are strong predictors of our success or failure in relationships and at work," Schwaba said. They normally improve over a lifespan, but for people with high lead exposure maturity comes harder and later.
Generational stereotypes usually fail to stand up to scientific testing, but if Gen X, who suffered by far the highest lead exposure, are unusually neurotic and inclined to complain to the manager, we now know why.
"For a long time, we've known lead exposure is harmful, but each new wave of research seems to identify new ways in which lead exposure harms society," Schwaba said. Leaded petrol is gone, but Schwaba noted many lead-lined water pipes have yet to be replaced, and much topsoil remains contaminated. He noted Black children in America are twice as likely to be exposed as whites.
Schwaba's work suggests past estimates that lowering lead exposure further could be worth $1.2 trillion in the United States alone probably undersell the potential benefits.
Flint Water Crisis: Everything You Need to Know
After officials repeatedly dismissed claims that Flint’s water was making people sick, residents took action. Here’s how the lead contamination crisis unfolded—and what we can learn from it.
Fearful of using the tap water to wash their food, Flint residents Melissa and Adam Mays prepare meals with bottled water.
A story of environmental injustice and bad decision making, the water crisis in Flint, Michigan, began in 2014, when the city switched its drinking water supply from Detroit’s system to the Flint River in a cost-saving move. Inadequate treatment and testing of the water resulted in a series of major water quality and health issues for Flint residents—issues that were chronically ignored, overlooked, and discounted by government officials even as complaints mounted that the foul-smelling, discolored, and off-tasting water piped into Flint homes for 18 months was causing skin rashes, hair loss, and itchy skin. The Michigan Civil Rights Commission, a state-established body, concluded that the poor governmental response to the Flint crisis was a “result of systemic racism.”
Later studies would reveal that the contaminated water was also contributing to a doubling—and in some cases, tripling—of the incidence of elevated blood lead levels in the city’s children, imperiling the health of its youngest generation. It was ultimately the determined, relentless efforts of the Flint community—with the support of doctors, scientists, journalists, and citizen activists—that shined a light on the city’s severe mismanagement of its drinking water and forced a reckoning over how such a scandal could have been allowed to happen.
Flint Water Crisis Summary
Long before the recent crisis garnered national headlines, the city of Flint was eminently familiar with water woes. For more than a century, the Flint River, which flows through the heart of town, has served as an unofficial waste disposal site for treated and untreated refuse from the many local industries that have sprouted along its shores, from carriage and car factories to meatpacking plants and lumber and paper mills. The waterway has also received raw sewage from the city’s waste treatment plant, agricultural and urban runoff, and toxics from leaching landfills. Not surprisingly, the Flint River is rumored to have caught fire—twice.
As the industries along the river’s shores evolved, so too did the city’s economy. In the mid-20th century, Flint—the birthplace of General Motors—was the flourishing home to nearly 200,000 people, many employed by the booming automobile industry. But the 1980s put the brakes on that period of prosperity, as rising oil prices and auto imports resulted in shuttered auto plants and laid-off workers, many of whom eventually relocated. The city found itself in a precipitous decline: Flint’s population has since plummeted to just 100,000 people, a majority of whom are African-American, and about 45 percent of its residents live below the poverty line. Nearly one in six of the city’s homes has been abandoned.
This was the lay of the land in 2011, when Flint, cash-strapped and shouldering a $25 million deficit, fell under state control. Michigan Governor Rick Snyder appointed an emergency manager (basically an unelected official chosen to set local policy) to oversee and cut city costs. This precipitated the tragic decision in 2013 to end the city’s five-decade practice of piping treated water for its residents from Detroit in favor of a cheaper alternative: temporarily pumping water from the Flint River until a new water pipeline from Lake Huron was built. Although the river water was highly corrosive, Flint officials failed to treat it, and lead leached out from aging pipes into thousands of homes.
Five-month-old Dakota Erler of Flint gets blood drawn from her heel in order to have her lead levels tested at Carriage Town Ministries in 2016.
Brittany Greeson
Lead levels in Flint water
Soon after the city began supplying residents with Flint River water in April 2014, residents started complaining that the water from their taps looked, smelled, and tasted foul. Despite protests by residents lugging jugs of discolored water, officials maintained that the water was safe. A study conducted the following year by researchers at Virginia Tech revealed the problem: Water samples collected from 252 homes through a resident-organized effort indicated citywide lead levels had spiked, with nearly 17 percent of samples registering above the federal “action level” of 15 parts per billion (ppb), the level at which corrective action must be taken. More than 40 percent measured above 5 ppb of lead, which the researchers considered an indication of a “very serious” problem.
Even more alarming were findings reported in September 2015 by Flint pediatrician Mona Hanna-Attisha: The incidence of elevated blood-lead levels in children citywide had nearly doubled since 2014—and nearly tripled in certain neighborhoods. As Hanna-Attisha noted, “Lead is one of the most damning things you can do to a child in their entire life-course trajectory.” In Flint, nearly 9,000 children were supplied lead-contaminated water for 18 months.
More problems with Flint water
Flint’s water supply was plagued by more than lead. The city’s switch from Detroit water to the Flint River coincided with an outbreak of Legionnaires’ disease (a severe form of pneumonia) that killed 12 and sickened at least 87 people between June 2014 and October 2015. The third-largest outbreak of Legionnaires’ disease recorded in U.S. history—as well as the discovery in 2014 of fecal coliform bacteria in city water—was likely a result of the city’s failure to maintain sufficient chlorine in its water mains to disinfect the water. Ironically, the city’s corrective measure—adding more chlorine without addressing other underlying issues—created a new problem: elevated levels of total trihalomethanes (TTHM), cancer-causing chemicals that are by-products of the chlorination of water.
Flint residents go to court
One of the few bright spots of the Flint water crisis was the response of everyday citizens who, faced with the failure of city, state, and federal agencies to protect them, united to force the government to do its job. On the heels of the release of test results in the fall of 2015 showing elevated lead levels in Flint’s water—and its children—local residents joined with NRDC and other groups to petition the U.S. Environmental Protection Agency (EPA) to launch an immediate emergency federal response to the disaster. The EPA failed to act, which only spurred residents on.
Flint Water Crisis
In early 2016, a coalition of citizens and groups—including Flint resident Melissa Mays, the local group Concerned Pastors for Social Action, NRDC, and the ACLU of Michigan—sued the city and state officials in order to secure safe drinking water for Flint residents. Among the demands of the suit: the proper testing and treatment of water for lead and the replacement of all the city’s lead pipes. In March 2016, the coalition took additional action to address an urgent need, filing a motion to ensure that all residents—including children, the elderly, and others unable to reach the city’s free water distribution centers—would have access to safe drinking water through a bottled water delivery service or a robust filter installation and maintenance program.
Those efforts paid off. In November 2016, a federal judge sided with Flint residents and ordered the implementation of door-to-door delivery of bottled water to every home without a properly installed and maintained faucet filter. A more momentous win came the following March with a major settlement requiring the city to replace the city’s thousands of lead pipes with funding from the state, and guaranteeing further funding for comprehensive tap water testing, a faucet filter installation and education program, free bottled water through the following summer, and continued health programs to help residents deal with the residual effects of Flint’s tainted water.
But the work of Flint residents and their advocates isn’t finished yet. Ensuring that the provisions of the 2017 settlement are met is an ongoing task. Indeed, members of the lawsuit have already returned to court to see that the city properly manages its lead service line replacement program and provides filters for faucets.
Flint Water Crisis Update
Does Flint have safe water yet?
Governor Snyder seemed to signal the all-clear in April 2018 when he announced that the city would stop providing bottled water to residents. Indeed, there is some evidence that the situation in Flint is improving, with lead levels remaining below the federal action level for the past four six-month monitoring periods, from July 2016 to June 2018.
However, it is important to note that thousands of Flint residents are still getting their water from lead pipes. The federal action level for lead is not a health-based number; it merely is an administrative trigger for remediation by the water utility. The EPA and other health authorities agree that there is no safe level of lead in water, so the continuing use of lead pipes by thousands of Flint residents remains a concern, particularly in light of their cumulative lead exposure over many years.
The FAST Start program implemented by the city in March 2016 is working to replace the thousands of lead and galvanized steel service lines that connect Flint water mains to city homes by 2020. But as of October 2018, only a little more than 7,500 pipes had been upgraded. The slow pace of progress drew the group of residents working with NRDC back to court to demand that Flint comply with its obligations to identify and replace lead pipes and supply filters to residents after each pipe replacement.
Flint water crisis charges
In early 2016, Michigan Attorney General Bill Schuette announced an independent review to “determine what, if any, Michigan laws were violated” during Flint’s drinking water disaster. Over the course of his investigation, 15 people have been charged as criminally responsible for causing or contributing to the crisis.
To date, the most senior official to be charged is Nick Lyon, director of Michigan’s Department of Health and Human Services (MDHHS), who is standing trial for involuntary manslaughter in the deaths of two men linked to the Legionnaires’ disease outbreak. While awaiting trial, Lyon remains the state’s health director.
Among other officials charged are the state’s chief medical executive, Dr. Eden Wells, who allegedly threatened to withhold funds for a project after researchers began looking into the Legionnaires’ outbreak, and four state officials charged with tampering with lead test results and instructing residents to flush their taps ahead of testing (which can produce artificially low lead-level results). Two former Flint emergency managers, three Flint city officials, and a handful of Michigan Department of Environmental Quality (MDEQ) and MDHHS employees have also been charged. Meanwhile, Governor Snyder has not been charged with any crime.
Why Is Lead-contaminated Water Bad?
Easy to melt and malleable, lead is a heavy metal that has been used by people for millennia. The Romans added it to makeup, cookware, and paint and even consumed it as a sweet seasoning and preservative in wine. They used lead in the pipes for their famous baths as well as their aqueducts. Not surprisingly, the word plumbing is a derivative of plumbum, the Latin word for lead.
Yet then as now, lead exposure was linked to serious health impacts—even madness and death. Modern science shows that even low levels of lead can impair the brain development of fetuses, infants, and young children. The damage can reverberate for a lifetime, reducing IQ and physical growth and contributing to anemia, hearing impairment, cardiovascular disease, and behavioral problems. Large doses of lead exposure in adults has been linked to high blood pressure, heart and kidney disease, and reduced fertility.
Pure lead pipes, solder, and fittings were banned from U.S. water systems in 1986 (it was only in 2014 that allowable lead levels in plumbing and fixtures dropped to 0.25 percent), and national regulations for lead testing and treatment of public water supplies were established in 1991 with the Lead and Copper Rule. While action by the water utility is required once the level of lead in public water supplies reaches 15 ppb (as measured at the 90th percentile of samples collected), the EPA acknowledges that “there is no safe level of exposure to lead.” Independent tests conducted in fall 2015 revealed that nearly 17 percent of samples from hundreds of Flint homes measured above the 15 ppb federal lead action level, with several samples registering above 100 ppb.
Fairness hearing begins Monday for Flint water settlement
FLINT, Mich. — The hearing to determine whether the state’s $600 million Flint water civil settlement will be officially approved begins Monday in the United States District Court for the Eastern District of Michigan.
Back in January, Judge Judith Levy gave preliminary approval to the settlement, establishing the process through which Flint residents could indicate their intention to file eligible settlement claims that will be processed and paid by the claims administrator.
Michigan Attorney General Dana Nessel and Gov. Gretchen Whitmer in August announced state’s portion of the preliminary agreement to settle the lawsuits filed against the state after Flint switched its public water supply to the Flint River in 2014.
Defendants that ultimately joined the settlement include the City of Flint, McLaren Regional Medical Center and Rowe Professional Services.
The fairness hearing began at 10 a.m. Monday and is scheduled to take three days, with no court scheduled Wednesday.
During the hearing, Judge Levy will listen to arguments and objections to determine whether the settlement is fair, adequate and reasonable.
A final ruling is expected to be entered later this summer.
Those who wish to monitor the hearing can request virtual courtroom access here.
If the settlement gets approved and funds are distributed to claimants, the state will have contributed more than $1 billion to Flint’s relief and recovery efforts.
Past contributions include a settlement agreement where $97 million was made available to replace all of the city’s lead service lines in its water system.
To date, Michigan has spent almost $423 million in response to the Flint water emergency.