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

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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.

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SIX TRUTHS

Reclaiming power from those who abuse it often starts with telling the truth. And in "This Is How Authoritarians Get Defeated," MoJo's Monika Bauerlein unpacks six truths to remember during the homestretch of an election where democracy, truth, and decency are on the line.

Truth #1: The chaos is the point.

Truth #2: Team Reality is bigger than it seems.

Truth #3: Facebook owns this.

Truth #4: When we go to work, we're in the fight.

Truth #5: It's about minority rule.

Truth #6: The only thing that can save us is…us.

Please take a moment to see how all these truths add up, because what happens in the weeks and months ahead will reverberate for at least a generation and we better be prepared.

And if you think journalism like Mother Jones'—that calls it like it is, that will never acquiesce to power, that looks where others don't—can help guide us through this historic, high-stakes moment, and you're able to right now, please help us reach our $350,000 goal by October 31 with a donation today. It's all hands on deck for democracy.

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