Are the PFAS being detected just the tip of the iceberg?

For years, PFAS monitoring has been treated as a question of detection: can laboratories find the compounds regulators are asking them to measure, and can they do so at concentrations low enough to protect drinking water, surface water and soil?

But that question may no longer be sufficient.

As PFAS regulation expands from individual substances towards groups, sums and “total PFAS” approaches, a more uncomfortable issue is coming into view. The PFAS most laboratories routinely detect may represent only a small part of the contamination actually present in the environment.

Targeted analytical methods remain essential. They provide sensitive, defensible data for known compounds such as PFOS, PFOA, PFNA and PFHxS. Yet thousands of PFAS exist, many behave differently in water and soil, and some precursors can transform into persistent degradation products long after they have entered the environment.

For monitoring professionals, this creates a difficult but unavoidable challenge. If the analytical method only looks for a defined list of compounds, what happens to the PFAS outside that list? And as regulators begin to ask broader questions about exposure, risk and compliance, are today’s routine methods still showing the full picture?

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