PFAS contamination has become one of the most pressing water quality challenges of our time. While industrial sites, military bases, and airports are often cited as the primary sources, new research reveals a more widespread issue.
The study, led by Eva Steinle-Darling, Carollo’s water reuse technical practice director, sheds light on how domestic sources contribute most of the PFAS entering wastewater systems and why upstream control, not treatment alone, is the key to lasting solutions.
Domestic Wastewater: The Largest PFAS Contributor
As the principal investigator of Water Research Foundation (WRF) project 5082, Eva explained that although industrial facilities release high concentrations of PFAS, the greatest overall load comes from household wastewater. Everyday products, such as shampoos, cleaning agents, and personal care items, continuously introduce PFAS into sewer systems.
“What we really need to do is be looking for PFAS at the source and try to not treat our way out of this problem,” Eva explained. “I have yet to see a single wastewater sample come back with no PFAS in it. If you analyze for PFAS, it’s there.”
Why Treatment Alone Won’t Solve the PFAS Problem
The study highlights that wastewater treatment plants are not producers, but rather receivers of PFAS, placing utilities in a challenging position. Case studies from utilities across the country, including the Trinity River Authority, Southern Nevada Water Authority, Orange County Water District, and Ann Arbor, Michigan, revealed a consistent “domestic fingerprint” of PFAS compounds. This pattern can help utilities identify when industrial discharges add extra loads; however, it does not eliminate the baseline presence from homes.
“Even for those of us who are informed and engaged, it’s really hard to avoid PFAS when they’re everywhere, even in something as simple as shaving cream,” Eva noted.
Toward PFAS Source Control and Policy Change
In addition to highlighting these findings, the team developed a practical guidance document to help utilities design monitoring programs, interpret results, and track sources. But as Eva stressed, the long-term solution lies in upstream control through stronger regulations and product phase-outs.
“Ultimately, the only thing that is really going to change the pickle we’re all in is proactive advocacy and policy, not just better treatment,” she concluded.
Read the full article in Wastewater Digest to explore Eva’s insights and the broader implications of WRF project 5082.
