But that does not mean residents can safely drink from their tap.
“The way Lead and Copper Rule compliance is calculated, 10 percent of sampled homes can have any level of lead whatsoever and the water system can still meet the lead action level,” said Elin Betanzo, founder of Safe Water Engineer LLC and a leading expert.
So that means your home can have lead levels in the 100s and, as long as you are in the 10 percent, the city will still be complying with federal standards. Low versus high lead levels are misleading anyway, even if your home’s lead levels reads 4 ppb, your tap water could still negatively affect your health.
An exceedance of 15 ppb by more than 10 percent of homes is not a health-based standard, it is just a methodology to indicate that the water distribution system’s corrosion control methods are not effective enough. Fifteen ppb may be the national “action level” for lead, but absolutely no amount of lead is safe for human consumption, according to the EPA’s maximum contaminant level goals.
The following quote comes directly from the EPA webpage: “The EPA has set the maximum contaminant level (MCL) goal for lead in drinking water at zero because lead is a toxic metal that can be harmful to human health even at low exposure levels. Lead is persistent, and it can bioaccumulate in the body over time. “
However, MCLs are technically nonenforceable health goals — reserved for contaminant levels in drinking water at which no adverse health effects are likely to occur with an adequate margin of safety.
The Safe Drinking Water Act should be legally requiring municipalities to provide drinking water that can be labeled safe using health-based standards, but that is just not the current case for lead.
A recent Bridge Magazine article suggested that since lead levels in Flint were consistent with other Michigan cities, residents should just trust their tap. To assure the people of Flint that their water is safe, simply because lead levels now fall within the range of other Michigan cities, should give every reader pause. (Editor’s note: Actually, Bridge wrote that Flint lead levels are below federal thresholds, but noted that meeting this metric does not fully protect public health.)
Should Flint accept the health risks of drinking lead, just because other cities are? Lead is bio-accumulative, meaning it builds up inside the body at a rate faster than the body can get rid of it. From years of drinking water with extreme lead levels, Flint residents are even more susceptible to health effects because of this bio-accumulation.
“Flint residents now have a body burden of lead that cannot be removed, so they must remain even more vigilant about their future lead exposure than those who have not been drinking the water in Flint. The two most effective strategies for this are using lead removing filters or bottled water.” Betanzo says in her letter to the Detroit News.
The fact is no city and no resident in the United States should accept anything other than safe drinking water from their local municipal water source.
About the author: Jill Ryan is executive director of Freshwater Future, based in Petoskey. This commentary originally appeared in the Traverse City Record-Eagle and was distributed by The Associated Press.