Why Fish Advisories Are Needed for PFAS
PFAS bioaccumulate in the food chain: aquatic invertebrates absorb PFAS from water and sediment, small fish consume invertebrates, and larger fish consume smaller fish — concentrating PFAS at each trophic level (biomagnification). PFAS concentrations in predatory fish can be hundreds to thousands of times higher than in the water they swim in. People who regularly consume fish from PFAS-contaminated waters can receive PFAS doses far exceeding what contaminated drinking water alone would provide.
Fish consumption advisories protect the public by recommending how often, and in what quantities, fish from specific water bodies can be safely consumed. Advisories are particularly important for recreational and subsistence anglers — who may consume fish far more frequently than general population dietary surveys suggest.
Advisory Development Process
State environmental and health agencies develop PFAS fish advisories using a risk assessment framework: measuring PFAS concentrations in fish tissue from the water body of concern, comparing measured levels to reference doses for PFAS, and calculating the number of meals per month that would keep exposure below reference dose targets.
Advisories typically specify different consumption limits for different populations: pregnant women, children, and nursing mothers are given the most restrictive limits, reflecting higher PFAS sensitivity. Some advisories distinguish between fish species (larger, older predatory fish accumulate more PFAS), preparation methods (skinning and trimming fat reduces PFAS in some species), and meal sizes.
Environmental Justice Considerations
Subsistence anglers — particularly from low-income communities, Indigenous populations, and recent immigrant communities that rely on locally caught fish for a significant portion of their protein — face disproportionate PFAS exposure risk through fish consumption. These communities may not receive advisory information in accessible languages or through channels they regularly consult.
Effective advisory communication for subsistence fishing communities requires culturally appropriate outreach through trusted community organizations, translation into relevant languages, and alternative food assistance programs for families that cannot afford to replace subsistence-caught fish with purchased protein. Environmental justice considerations must be central to advisory programs, not an afterthought.