Children in Missouri had elevated levels of lead in their blood at a greater rate than almost any other state, according to a massive national study published last week.

More than 80% of Missouri children had some level of lead in their blood.

The study, authored by doctors at Boston Children’s Hospital and Quest Diagnostics, was published last week in JAMA Pediatrics, a peer-reviewed journal published by the American Medical Association. It included 1.1 million tests conducted by Quest Diagnostics nationwide between 2018 and 2020.

There is no safe level of lead in a child’s blood. Exposure to the metal can cause brain and nervous system damage, slow a child’s growth and development and lead to learning, behavior, hearing and speech problems.

But the study focused on both detectable blood lead levels, one microgram per deciliter, as well as elevated levels, 5 micrograms per deciliter.

In Missouri, 4.5% of children had elevated levels of lead in their blood. In Kansas, that figure was 2.6% of children, both far ahead of the 1.9% national average.

The proportion of children with any detectable level of blood lead was higher in both states than the national average of about 50%. In Kansas, 65% of kids had detectable levels of blood lead, compared to 82% in Missouri.

According to the study, elevated blood levels were once ubiquitous but had fallen over the past 40 years because of policies limiting lead and eliminating it from gasoline, paint, plumbing pipes and consumer products.

But exposure is still possible and disproportionately affects children in families living at or below the poverty line, in older housing or communities with high concentrations of poverty.

“There has been significant progress in reducing lead exposure throughout the country,” the study says. “This study demonstrates, however, that there are still substantial individual- and community-level disparities that have important implications for addressing childhood lead exposure.”

Missouri and Kansas also have some of the highest numbers of lead service lines, the pipes running from water mains into homes and buildings, of any state.

Missouri ranked sixth for the most lead service lines — fourth if calculated per 100,000 residents. Kansas had the third most per capita.

Missouri Independent is part of States Newsroom, a network of news bureaus supported by grants and a coalition of donors as a public charity. It can be found at missouriindependent.com.

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