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Alameda NAS Sees 99.9% PFAS Reduction With New Filter Technology

by Post Staff Reporting On In News | Comments Disabled

A new filter system developed by environmental remediation company Regenesis has proven highly effective in removing toxic PFAS chemicals from groundwater—specifically during a case study at the former Naval Air Station in Alameda, where it cut PFAS levels by 99.9%.

Alameda Post - on the Alameda Point shoreline, trucks and equipment are stationed around a PFAS remediation area [1]
Navy contractor injecting special liquified carbon solution into the ground in 2023 where Navy firefighters once trained with PFAS-containing fire suppression foam. Black solution, visible on soil in the center, is meant to sequester PFAS in a wall of carbon and prevent it from migrating to the Oakland Estuary. Photo by Richard Bangert.

The technology, known as a permeable adsorptive barrier (PAB), earned Regenesis the 2025 Remediation Project of the Year award from Environmental Analyst’s Sustainability Delivery Awards. The Alameda project used a 720-foot-long barrier made of PlumeStop colloidal activated carbon, installed along the harbor shoreline to prevent PFAS from migrating into surface waters. Check out the science behind the project [2].

According to Regenesis [3], the barrier works by injecting fine particulate carbon into the aquifer, forming passive filter zones that pull PFAS from groundwater as it naturally flows. Program Director Ryan Moore said the PAB not only removes PFAS but also immobilizes them in place, likely eliminating the need for filter disposal.

“For our system, we don’t necessarily have to do anything (related to) disposal,” Moore said. “What we’re doing is a combination of source removal, source control, along with attacking the dissolved plume.”

A PAB user “may not have to do anything further so there’s no disposal required,” said Moore.

While the PAB is customized for each site and cost varies, it can last more than 40 years without needing replacement. The Alameda site is one of over 70 locations globally using the technology, including airports and industrial facilities in Europe.

Read a case study of PFAS migration at Alameda’s former Naval Air Station at the Regenesis [4] website.