Thomas Robinson | December 15th, 2020
In a legislative presentation Tuesday morning, David Cwiertny, Director of CHEEC, and Dr. Michelle Scherer, a professor at the University of Iowa, presented their work on lead in Iowa’s drinking water.
CHEEC, the Center for Health Effects of Environmental Contamination, has worked with schools around the state to assess the amount of lead in drinking water through their Grants to Schools program. The program provides $10,000 for schools to sample every drinking water outlet, and then take steps to address any potential lead or copper contamination. On average, they’ve found it only takes $2,800 for testing and remediation suggesting that more can be done for Iowa’s schools without breaking the bank. Cwiertny emphasized the large cost to benefit ratio seen for lead interventions, where for every $1 invested there is around a $10 benefit. Unfortunately, COVID-19 has created concerns about school drinking water as stagnation can increase lead and copper levels in drinking water. As schools begin to operate drinking fountains again there may be an increased chance for lead and copper exposure.
Dr. Michelle Scherer discussed her research group’s efforts to test drinking water from both municipal systems, as well as private wells in Iowa. Recent work by graduate students Amina Grant, and Danielle Land has found that some Iowans are potentially being exposed to lead in their drinking water. Shockingly, they found that potentially 65,000 Iowans had drinking water that exceeded the EPA action level of 15 parts per billion (ppb). Dr. Scherer’s take-away message was that we need to know more about the challenge facing Iowa. She emphasized that in home lead and copper testing needs to be more prevalent and available to properly evaluate the issue. Similarly to work being done in Illinois, Iowa needs to map lead service lines (LSLs) so that consumers can be made aware of potential exposures. Currently the Center for Disease Control (CDC) suggests that public health interventions need to happen at 5 microgram per deciliter blood lead levels in children and Dr. Scherer suggested that in the face of recent work these interventions should happen at lower blood lead levels. To better address the lead challenge facing Iowa both speakers stressed the importance of filter first legislation that could help reduce lead exposure in children.
Children are particularly vulnerable to lead as there is no safe level of exposure without potential health risks. In Iowa, 1 in 5 newborns have elevated blood lead levels, and there is no difference between rural and urban populations. Traditionally, lead is thought to come from paints, air, and soils, however, it is becoming more apparent that drinking water is a prevalent source for lead exposure. Lead in drinking water is difficult to control and regulate since most contamination comes from the distribution system and not providers. Currently, there are many different guidelines and regulations for lead contamination. Unfortunately, Iowa is on the back end where water outlets are taken out of service only if lead levels exceed 20 ppb, which is 4 times the level accepted for bottled water (5 ppb). Iowa needs a health based lead regulation that can be used by consumers to evaluate whether their drinking water is safe, and it isn’t unreasonable for a low level like 1 ppb to be the goal.