On Tuesday (4/17/18), I attended my first Cape Fear River Watch event to hear the water results of the GenX exposure study being conducted by NC State’s Center for Human Health & the Environment. It seems the results were not surprising: the contaminant levels were below the regulatory thresholds in all samples taken. Of course, these samples were all after Chemours reduced discharge in summer 2017.
The results of blood and urine samples, along with analysis of health questionnaires, are not yet available. And, even when available, these results will only show point-in-time values. Collection of samples over the years (or decades) of potential exposure did not happen, and there is no plan for prospective collection. And, the study leaders made note of the limited population health data available more broadly, making it near impossible to understand the baseline of conditions like asthma in the region overall, regardless of exposure to GenX.
And, while the purpose of this meeting was not to discuss the values set for exposure, the 140 ppt health goal was brought up, and the limitations of current knowledge were reaffirmed. The 140ppt value was derived from four toxicology studies (all done in animals), and the value does not take into account historical (or duration of) exposure. The attendees were also reminded that it is unknown how long GenX stays in tissue, and there is no knowledge about if bathing or soaking in contaminated water is a risk. And, UNCW is doing studies on fish from the Cape Fear River to assess contamination.
One of the shortcomings researchers brought up was the low participation rate (aka small sample size). Despite being an active citizen scientist living in Wilmington, I hadn’t even heard about the chance to join this study. So, perhaps more could be done on the publicity side. Given the small sample, it will be challenging to test if there is variability in chemical levels by day of the week, time of the day, or even area of town.
When it comes to the key questions around what people can do to reduce exposure in their homes, all the under-sink reverse osmosis systems tested (n=8) worked against GenX and other contaminants. While that is good news for homeowners, it is a challenge for those who rent, and for people living in Section 8 housing. Has there been any response from the County on how they will work to cut exposure to people living in provided housing?
Another item that I haven’t heard or seen an update on is the request by Governor Cooper in July 2017 for CDC to perform a public health assessment of long-term effects. Has CDC responded?