
COMMISSION AGENDA – Action Item No. 10a Page 2 of 7
Meeting Date: March 8, 2022
Template revised June 27, 2019 (Diversity in Contracting).
JUSTIFICATION
PFAS are a group of man-made chemicals that have been in use in industrial and commercial
products since the 1940s. PFAS are often referred to as “forever chemicals” because they break
down very slowly, if at all. One product known to contain PFAS is aqueous film-forming foam
(AFFF). AFFF is used for firefighting, primarily to extinguish fuel-based fires. All AFFFs contain
PFAS. The Federal Aviation Administration (FAA) requires certified airports to use AFFF for
firefighting (the Department of Defense (DOD) similarly requires use of AFFF at military
installations). Over the past few years, AFFF at airports and military bases has been identified as
the source of soil and/or groundwater contamination in communities near airports and military
bases throughout the United States.
Over the past few years, regulatory agencies at the state and federal level have progressed with
planning and rulemaking to address PFAS. Although progress is being made, there are still few
states with laws in place, and there are no current federal standards or regulation of PFAS.
Additionally, the FAA and DOD still require use of AFFF, and do not allow for use of fluorine-free
foams that do not contain PFAS. In 2021, the US Environmental Protection Agency (EPA) released
their PFAS Strategic Roadmap, which outlines the ‘whole-of-agency’ approach to address PFAS.
This document includes their strategic plan for regulation of PFAS from manufacture, to use in
products, to cleanup. Similarly, in 2021, the State of Washington Department of Ecology (Ecology)
finalized a PFAS Chemical Action Plan, outlining the State’s proposed plan for elimination of PFAS
from commercial products, and regulation of PFAS in the environment. The FAA and DOD are in
the process of revising their regulations to allow for use of fluorine-free firefighting foam
alternatives to AFFF that do not contain PFAS. These revisions are expected in 2023.
The EPA has initiated the process to designate two PFAS chemicals (PFOS and PFOA) as hazardous
substances under the Comprehensive Environmental Response, Compensation, and Liability Act
of 1980 (CERCLA), also known as the Superfund law. This designation could be complete as early
as late 2022. EPA has also initiated multiple regulation changes to the Clean Water Act, National
Pollution Discharge Elimination System (NPDES), and others that will directly impact
environmental permits, and compliance at SEA. The State set acceptable levels of PFAS in drinking
water in 2021. These criteria set the stage for Ecology to develop cleanup standards for regulation
and cleanup of PFAS chemicals under the state’s Model Toxics Control Act (MTCA). Although
these regulations and cleanup standards are not yet in place, it is important for SEA to remain
proactive in the characterization of PFAS at SEA. Continued PFAS characterization will also assist
capital project teams in their efforts to identify PFAS contaminated soils within project footprints
and will assist assessment of environmental projects such as stormwater infiltration siting and
permitting of backup emergency drinking water wells.
Since 2018, the Aviation Environment & Sustainability team has been conducting preliminary
sampling of the soil and groundwater at SEA to confirm the presence or absence of PFAS in the
environment, starting with the areas of greatest potential for exposure: areas with the potential
for groundwater to migrate away from the airport, and into surrounding communities. These
priority areas include the Airport Fire Station, the Fuel Farm, the Former Fire Training Area