PFAS removal from stormwater relies on sorbent media that binds the compounds as water passes through, paired with a format matched to the site's flow and infrastructure. Here's how the mechanism works, what affects performance, and how to verify results before full-scale deployment.
PFAS removal from stormwater works by passing runoff through a sorbent filtration media engineered to bind per- and polyfluoroalkyl substances as water flows past, rather than by settling or screening them out. Because PFAS is dissolved, not particulate, conventional sediment control has no effect on it, which is why permit holders dealing with PFOA, PFOS or related compounds need a media-based approach layered onto whatever sediment system is already in place.
Why doesn't standard stormwater treatment catch PFAS?
Most stormwater infrastructure — catch basins, hydrodynamic separators, detention basins — is built to settle out sediment and total suspended solids (TSS). PFAS compounds don't behave that way. They stay dissolved in the water column, so a system that only slows flow and lets particles drop out will pass PFAS straight through. The ITRC's technical guidance on PFAS treatment technologies describes this gap directly: proven treatment methods remain limited in capacity, and removal depends on contact between the dissolved compound and a sorbent engineered to bind it, not on time or settling. This is the same dissolved-pollutant gap that shows up with metals and phosphorus, except PFAS resists breakdown entirely, which is part of why it's called a forever chemical in EPA research.
What does PFAS-targeted media actually capture, and what doesn't it touch?
Abtech's Smart Sponge® Quanta™ media is formulated specifically to capture PFAS from flowing water, as part of the broader Smart Sponge® family where each media targets a different contaminant class. Standard Smart Sponge® binds hydrocarbons and oil; Smart Sponge® HM targets dissolved metals and phosphorus; Smart Sponge® Plus is formulated against bacteria. PFAS requires its own chemistry because the compounds don't behave like oil, metal ions or pathogens — they're small, highly stable molecules that resist the binding mechanisms built for other pollutants. When a site's runoff carries more than one contaminant class alongside PFAS — oil sheen from a fueling area, or dissolved zinc from metal surfaces — media types can be combined within a single system so each pollutant meets a media built for it, rather than asking one media to do a job outside its design.
How do site conditions and runoff characteristics change what a PFAS system needs to do?
PFAS sources in stormwater vary by site history. Airports and fire-training grounds carry risk from legacy aqueous film-forming foam; industrial sites with certain manufacturing or surface-treatment processes carry a different exposure profile; municipal catchments may see PFAS from mixed urban sources entering through storm drains. The EPA's account of a PFAS-contaminated detention pond in Iowa — created when firefighting foam used to extinguish a fire entered the stormwater collection system — shows how concentrated and situational a PFAS release can be, and how quickly volume can escalate once rain and other inflows mix with the contaminated water. That situation called for a package treatment plant sized to a specific contaminated volume. A stormwater catchment with chronic, lower-level PFAS from ambient sources is a different sizing and format problem than an acute release, even though the underlying media chemistry addresses the same compounds. Flow volume, how concentrated the PFAS load is, and whether the water also carries hydrocarbons, metals or elevated organic carbon all shape which media and how much of it is needed.
What formats carry PFAS media into existing infrastructure?
Media needs a format to hold it against the water it treats, and the two are specified separately. The Ultra Urban® Filter is a catch basin insert, custom-fabricated to fit a given basin's geometry, so it can go into an existing storm drain without excavation and without pumps; stainless steel versions carry a 20-year warranty. For larger or more concentrated flows, bulk Smart Sponge® media can be loaded into existing pressure vessels, tanks or vaults, or into Abtech's own vessels and the skid-mounted Smart Skid — note that skid systems run with pumps and flow controls rather than passively. Smart Pak®, Smart Bags and EOP units are additional ways to place media at vaults, channels, outfalls and discharge points. Choosing between a catch basin insert, a bulk-loaded vessel and a skid comes down to flow volume and whether the site already has infrastructure the media can drop into versus needing a standalone treatment point.
Frequently asked questions
Can one media treat PFAS and other contaminants at the same time?
A single system can combine media types — for example, Smart Sponge® Quanta™ for PFAS alongside Smart Sponge® HM for dissolved metals — when a site's runoff carries more than one contaminant class. Each media is still formulated for its own pollutant group; combining them addresses multiple objectives in one system rather than relying on one media to do work it wasn't designed for.
Is catch basin insert treatment enough for a site with a known PFAS source?
It depends on flow volume and concentration. A custom-fabricated Ultra Urban® Filter insert works well for routine catch basin flows without excavation or power. A site with a concentrated or high-volume PFAS load, such as a legacy foam release, may call for bulk media in a vessel or skid sized to that volume instead, which is why a site assessment and testing come before format selection.
Does sediment removal count as PFAS treatment for permit purposes?
No. PFAS stays dissolved in the water column, so TSS controls and sediment capture do not address it. A permit holder relying on sediment BMPs alone still has an open dissolved-pollutant gap that requires a sorbent media specified for PFAS.
How long before column or pilot testing shows results?
Abtech has not published a standard timeline for column or pilot testing, since it depends on the water sample, the facility's flow, and the scale of the pilot. The sequence runs from a site assessment to laboratory column testing on the customer's own water, then pilot testing for larger applications before full-scale deployment.
What's the difference between Smart Sponge® Quanta™ and the rest of the Smart Sponge® family?
Standard Smart Sponge® is a hydrophobic, oil-attracting media for hydrocarbons; Smart Sponge® HM targets dissolved metals and phosphorus; Smart Sponge® Plus is an antimicrobial media for bacteria such as E. coli; Smart Sponge® AC addresses dissolved hydrocarbons and organic compounds that raise total organic carbon. Smart Sponge® Quanta™ is the media in the family formulated to capture PFAS specifically, reflecting the company's approach of matching media chemistry to the contaminant rather than using one media for every pollutant class.