Here’s How Flint’s Lead Disaster Is Likely to Affect Its Children


I’ve been saying for a while that (a) the elevated lead levels in Flint were fairly moderate and probably didn’t cause a huge amount of damage, and (b) the water is now safe to drink. A reader wants me to put my money where my mouth is:

OK. The exact data I’d like to have doesn’t seem to be available, but I can provide a rough sense of the landscape. Between 2013 and 2015, the number of children in Flint with elevated blood lead levels (above 5 m/d) rose from 2.4 percent to 4.9 percent. If you plot this out, it suggests that the average increase in BLL was somewhere between 0.2 m/d and 1 m/d. Increases in BLL are approximately associated with a loss of one IQ point per m/d, so this corresponds to an average loss of perhaps half an IQ point. However, most studies are based on children with elevated BLLs throughout their childhood. The elevated blood levels in Flint only lasted for about 18 months, which suggests that even half an IQ point is probably high. It’s more like a quarter or a third of an IQ point. That’s not even measurable.

Now, this is cocktail-napkin stuff, and I’m not an expert. All I’m trying to do is give you a rough idea of the magnitude of the problem. Anyone who has better data and knows how to analyze it more rigorously is welcome to set me straight if I’ve made a mistake.

That said, it’s unlikely that I’m off by a lot. What happened in Flint was a horrible tragedy, but it’s unlikely to have a major cognitive impact on the city’s children. However, this is on average. It could have a major impact on individual children, and this is why parents should have their kids tested for lead exposure. This is doubly true in areas of Flint that are known to have had especially high water lead levels.

As for the question about drinking the water today, that’s easier to answer: thousands of residential tests confirm that lead levels in Flint’s water are below the EPA’s action level of 15 parts per billion. What’s more, blood testing confirms that elevated BLLs have returned to their 2013 levels. All of this is strong evidence that Flint water is now safe to use.

DOES IT FEEL LIKE POLITICS IS AT A BREAKING POINT?

Headshot of Editor in Chief of Mother Jones, Clara Jeffery

It sure feels that way to me, and here at Mother Jones, we’ve been thinking a lot about what journalism needs to do differently, and how we can have the biggest impact.

We kept coming back to one word: corruption. Democracy and the rule of law being undermined by those with wealth and power for their own gain. So we're launching an ambitious Mother Jones Corruption Project to do deep, time-intensive reporting on systemic corruption, and asking the MoJo community to help crowdfund it.

We aim to hire, build a team, and give them the time and space needed to understand how we got here and how we might get out. We want to dig into the forces and decisions that have allowed massive conflicts of interest, influence peddling, and win-at-all-costs politics to flourish.

It's unlike anything we've done, and we have seed funding to get started, but we're looking to raise $500,000 from readers by July when we'll be making key budgeting decisions—and the more resources we have by then, the deeper we can dig. If our plan sounds good to you, please help kickstart it with a tax-deductible donation today.

Thanks for reading—whether or not you can pitch in today, or ever, I'm glad you're with us.

Signed by Clara Jeffery

Clara Jeffery, Editor-in-Chief

We Recommend

Latest

Sign up for our newsletters

Subscribe and we'll send Mother Jones straight to your inbox.

Get our award-winning magazine

Save big on a full year of investigations, ideas, and insights.

Subscribe

Support our journalism

Help Mother Jones' reporters dig deep with a tax-deductible donation.

Donate

Share your feedback: We’re planning to launch a new version of the comments section. Help us test it.