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

Let our journalists help you make sense of the noise: Subscribe to the Mother Jones Daily newsletter and get a recap of news that matters.


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.

FACT:

Mother Jones was founded as a nonprofit in 1976 because we knew corporations and the wealthy wouldn't fund the type of hard-hitting journalism we set out to do.

Today, reader support makes up about two-thirds of our budget, allows us to dig deep on stories that matter, and lets us keep our reporting free for everyone. If you value what you get from Mother Jones, please join us with a tax-deductible donation today so we can keep on doing the type of journalism 2020 demands.

payment methods

FACT:

Mother Jones was founded as a nonprofit in 1976 because we knew corporations and the wealthy wouldn't fund the type of hard-hitting journalism we set out to do.

Today, reader support makes up about two-thirds of our budget, allows us to dig deep on stories that matter, and lets us keep our reporting free for everyone. If you value what you get from Mother Jones, please join us with a tax-deductible donation today so we can keep on doing the type of journalism 2020 demands.

payment methods

We Recommend

Latest

Sign up for our free newsletter

Subscribe to the Mother Jones Daily to have our top stories delivered directly 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