STOMP, PFAS, and the Shift from Filtration to Degradation

Last week, the federal government made an important — if understated — move in the evolving contaminant landscape.

The U.S. Department of Health and Human Services, via ARPA‑H, announced STOMP (Systematic Targeting of Microplastics), a $144 million initiative focused on measuring, understanding, and ultimately removing microplastics from the human body. The announcement coincided with EPA’s release of its Draft Sixth Contaminant Candidate List (CCL‑6), which for the first time includes microplastics alongside PFAS, pharmaceuticals, and disinfection byproducts as priority contaminant groups (EPA & HHS, April 2026).

This pairing matters.

Both PFAS and microplastics share a core problem: they are persistent, mobile, bioaccumulative — and not effectively addressed by conventional filtration or treatment systems.

STOMP explicitly recognizes this limitation. Rather than focusing on capture or containment, the program prioritizes measurement, mechanism, and removal — a shift toward understanding how persistent contaminants move, accumulate, and can be chemically altered rather than simply displaced (ARPA‑H STOMP program, 2026).

That shift mirrors what decades of wetland science have already demonstrated.

Natural and constructed wetlands support redox‑driven, microbial, and biogeochemical processes capable of transforming persistent contaminants at the molecular level. These systems rely on time, chemistry, and biology, not screens or membranes — emphasizing degradation over sequestration and reducing long‑term environmental and regulatory liability.

EPA’s inclusion of microplastics on CCL‑6, alongside PFAS, does not immediately regulate either. But it does signal trajectory: expanded monitoring, accelerated research, and the groundwork for future standards under the Safe Drinking Water Act (EPA CCL‑6 materials, 2026).

In short: PFAS and microplastics are now policy cousins, and the federal conversation is slowly shifting from “How do we filter these out?” to “How do we actually break them down?”

STOMP doesn’t replace wetland‑based solutions — it validates them.

At Wetland Extent Landward (WEL) and Just Add Wetlands (JAW), we see this moment as science catching up to systems that have been quietly managing complex chemistry for millennia.

The future of contaminant management isn’t just engineered — it’s ecological.