Coastal communities and those who depend on recreational or commercial fishing face PFAS exposure risks that extend beyond drinking water into the food they harvest from local waters. Marine and estuarine environments have become significant PFAS repositories — receiving inputs from inland runoff, atmospheric deposition, and direct industrial discharge — with implications for seafood safety and the health of fishing-dependent populations.
How PFAS Enter Marine Environments
Marine PFAS contamination has multiple source pathways:
River inputs: Freshwater rivers carry PFAS from inland sources — industrial facilities, landfills, military bases, and urban runoff — into estuaries and coastal waters. This represents the largest pathway for land-based PFAS to reach marine environments.
Wastewater effluent: Coastal treatment plants discharge PFAS-containing effluent directly to marine waters. Because treatment plants do not remove PFAS, even well-functioning plants continuously add PFAS to receiving waters.
Atmospheric deposition: PFAS, particularly volatile precursors and short-chain compounds, travel through the atmosphere and deposit on ocean surfaces globally. This pathway has been documented in remote marine environments far from any point source, explaining why PFAS have been detected in Arctic marine mammals and Antarctic wildlife.
Direct marine industry sources: Port operations, shipyards, offshore drilling, and marine fire suppression activities can all contribute PFAS directly to coastal waters.
PFAS in Marine Seafood
PFAS bioaccumulate through marine food webs — the same process that concentrates heavy metals like mercury in large fish applies to PFAS. The pattern differs somewhat from mercury because PFAS bind to proteins rather than fat, meaning the highest concentrations are found in blood, liver, and kidney tissue rather than muscle (the primary edible portion).
Studies of PFAS in commercially and recreationally caught seafood have found:
- Shellfish (oysters, mussels, clams) accumulate PFAS from water through filter feeding and often show the highest concentrations among seafood types
- Bottom-dwelling species in contaminated estuaries show elevated PFAS in liver tissue
- Fatty fish in contaminated areas show moderate PFAS levels, particularly long-chain sulfonates
- Open-ocean pelagic fish generally show lower PFAS than nearshore or estuarine species
Fishing Community Exposure Patterns
Subsistence fishing communities — those who depend on local catch as a primary protein source rather than supplementing a varied commercial food diet — face the highest dietary PFAS exposure from seafood. These communities, which often include indigenous and low-income coastal populations, may consume significantly more local seafood per week than health advisories assume when calculating acceptable contaminant levels.
Several states, including New Hampshire, Michigan, and California, have issued PFAS fish consumption advisories for specific water bodies based on elevated PFAS in locally caught fish. These advisories typically recommend limiting consumption of certain species or sizes of fish caught in designated waters.
Fishing Community Water Safety
In addition to seafood-based exposure, coastal fishing communities may face PFAS in drinking water from contaminated wells near marine industrial areas or military bases. This dual exposure pathway — contaminated drinking water and locally caught seafood — can result in substantially higher total PFAS body burden than either route alone.
For households in affected coastal communities, investing in effective drinking water filtration addresses the controllable exposure route. Reverse osmosis systems are the most reliable technology for comprehensive PFAS removal from drinking water. Testing home water through a certified laboratory establishes baseline exposure levels.
Policy and Advocacy Opportunities
Fishing community advocates have been effective in pushing for stronger PFAS regulation by connecting traditional food security and cultural practices to chemical contamination. Several tribes have successfully pursued PFAS remediation at military bases affecting traditional fishing grounds. Commercial fishing organizations have similarly advocated for stronger source controls to protect the value of their catch in export markets, where PFAS testing requirements are increasingly common.
Staying engaged with state environmental agencies and local watershed organizations provides fishing community members with early information about new fish consumption advisories and remediation activities in their area.