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.

HERE ARE THE FACTS:

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ONE MORE QUICK THING:

Our fall fundraising drive is off to a rough start, and we very much need to raise $250,000 in the next couple of weeks. If you value the journalism you get from Mother Jones, please help us do it with a donation today.

As we wrote over the summer, traffic has been down at Mother Jones and a lot of sites with many people thinking news is less important now that Donald Trump is no longer president. But if you're reading this, you're not one of those people, and we're hoping we can rally support from folks like you who really get why our reporting matters right now. And that's how it's always worked: For 45 years now, a relatively small group of readers (compared to everyone we reach) who pitch in from time to time has allowed Mother Jones to do the type of journalism the moment demands and keep it free for everyone else.

Please pitch in with a donation during our fall fundraising drive if you can. We can't afford to come up short, and there's still a long way to go by November 5.

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