Ohio's PFAS Legacy Runs Along the River

Ohio carries one of the nation's most consequential PFAS histories, and its origin sits just across the Ohio River in West Virginia at the DuPont Washington Works plant. Discharges from that facility reached Little Hocking and other river communities and became the factual core of the landmark C8 (PFOA) and Teflon litigation. The figures still land hard: a single untreated Little Hocking sample was measured at 2,500 ppt PFOA, and internal records show DuPont recognized the contamination as far back as 1984. A 2023 DuPont settlement channels roughly $65 million toward Ohio River PFAS cleanup, with about $8.5 million set aside for Little Hocking to retire 110 wells. The Environmental Working Group has tallied more than 100 Ohio water systems carrying detectable PFAS (sources: EWG, WTAP, PFAS Project Lab).

For anyone in Washington County or along the Ohio River corridor, that paper trail is a direct reason to learn your own numbers. The C8 saga did more than harm one community, it helped propel PFAS into national policy, so Ohio residents live downstream, in both senses, of the case that shaped today's rules. Elsewhere in the state, detection differs system by system, which means your individual result is still the figure that governs your decisions.

The Little Hocking numbers reward a second look. A reading of 2,500 ppt in an untreated sample is not a rounding error against a 4 ppt federal limit; it is hundreds of times higher, which is why the retirement of 110 wells and a dedicated cleanup fund made sense rather than a simple advisory. The fact that awareness inside the company dated to 1984 is part of why Ohio's corridor became a template for how long these plumes can sit unaddressed. For residents that long timeline is the practical lesson: contamination here is measured in decades, so a one-time clean report does not necessarily close the book.

Ohio's Action Levels and the 2024 Federal MCLs

Ohio published non-enforceable action levels early: 4 ppt for PFOS and PFOA, 10 ppt for PFHxS, PFNA, and GenX, and 2,000 ppt for PFBS, as catalogued by BCLP. In 2024 the EPA finalized enforceable national limits that mirror those tight lead figures, 4 parts per trillion each for PFOA and PFOS and 10 ppt each for PFNA, PFHxS, and GenX. Ohio's public systems must now satisfy the federal MCLs rather than treating the action levels as the ceiling.

How to Test Your Water

Ohio's public utilities disclose PFAS inside their annual water-quality reports, the obvious first stop for a city customer. Private-well owners, abundant across the state's rural and river-adjacent counties, should turn to a lab certified for EPA Method 537.1 or 533. PFAS is invisible and flavorless, so laboratory testing is the only dependable check available.

Three Ways to Take It Out

Granular activated carbon (GAC) adsorbs longer-chain compounds such as PFOA and PFOS and is a common whole-house answer, a fitting match given the region's PFOA legacy. Strong-base anion-exchange resin captures a broader range, holding shorter-chain compounds that carbon can miss. Reverse osmosis (RO) routes water through a membrane and rejects the widest array at a single tap.

Point-of-entry systems treat every fixture in the house, while point-of-use units defend drinking and cooking water. Many Ohio households along the river pair a whole-house carbon or anion system with an RO unit at the kitchen sink. Whichever combination you settle on, carbon and resin media have a finite service life, so budget for scheduled media changes and a periodic retest to be sure the system keeps clearing the low federal limits.

With Ohio's documented river-corridor history on the books, test your water and match a proven method to your result.