For many years, per- and polyfluoroalkyl substances (PFAS) have been ubiquitous in American commerce and industry. That ubiquitous use, and the fact that PFAS chemicals do not break down in the environment, has led to the presence of PFAS in groundwater to varying degrees throughout the country. As a result, the US Environmental Protection Agency (EPA) has turned its full attention to PFAS regulation. In fact, EPA issued a PFAS Strategic Roadmap that sets timelines by which EPA plans to take specific actions, as it states, “to safeguard public health, protect the environment, and hold polluters accountable.” Pursuant to the Roadmap, the EPA issued interim health advisories on June 15, 2022, in which they advised that the safe lifetime drinking level for PFAS chemicals are as low as .004 parts per trillion (ppt) for perfluorooctanoic acid (PFOA) and .02 ppt for perfluorooctane sulfonic acid (PFOS). To put that in context, one should understand that a level of .004 ppt equates to 1 drop out of 4.5 billion gallons of water., and that such miniscule levels are undetectable by current testing instruments, essentially making it zero.
According to the EPA, its interim health advisories are determined based on review of all available science by the EPA’s Science Advisory Board. It is unclear, however, on what the Science Advisory Board relied in reaching its conclusions concerning the level of exposure at which to set the advisory limit, as there is not only no current epidemiological studies that demonstrate that PFAS chemicals actually cause any adverse health consequences, there are certainly no scientific studies that support a level of exposure near zero.
The EPA’s interim health advisories are not regulations, and are not enforceable. They do, however, portend the maximum contaminant levels (MCLs) that the EPA is considering and may eventually enact for drinking water. The EPA is scheduled to issue its proposed regulatory level in fall 2022—only months away—and the rule is expected to go into effect in 2023.
In setting the MCLs, the EPA attempts get the MCL as close to the health advisory limit as feasible. Unlike with health advisories, though, the EPA must prepare a health risk reduction and cost analysis (HRRCA), which takes into account the quantifiable and non-quantifiable benefits that will result from the proposed standard, as well as the increased costs that will result from the proposed drinking water standard. It does not, however, require EPA to consider the benefits in the use of PFAS, including improved safety, durability and fuel efficiency in applications such as cars, airplanes, buildings and electronics, not to mention firefighting where its use is still mandated.
Should the EPA enact drinking water standards near the current health advisory limits, it is likely that the vast majority, if not all, water systems in the United States will require costly remediation. The State of New York estimates that remediation of PFAS in the state’s drinking water to a level of 4 parts per trillion, a standard 1,000 time less strict than the amount
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