Table 2.

Concentrations of replacement PFAS in the Environment.

Compound	Matrix	Concentration	Reference
HFPO-DA	Freshwater	0.1–0.8 ng/L	[49,75]
	Drinking water	1.4–8.0 ng/Lb	[76]
	Wastewater	Up to 40,000 ng/Lc	[33]
	Sediment	>100 pg/g	[71]
	Plant material	1–27 ng/g wwb	[76]
6:2 Cl-PFAES	Freshwater	<0.01–50 ng/L	[77]
	Drinking water	<0.01–50 ng/L	[77]
	Marine	0.21–7.9 ng/L	[78,79]
	Wastewater	7600 ng/L 65000–120000 ng/L (influent) 43000–78000 ng/L (effluent)	[77,78]
	Sediment	200 pg/g–0.013 ng/g	[71,80]
PFECHS	Freshwater	0.16–5.7 ng/L 20 ng/La	[39,59,60,69]
	Drinking water	4 ng/L	[73]
	Marine	0.043–0.14 ng/L	[62]
	Wastewater	10–195 ng/L	[68,74]
	Sediment	0.0004 ng/g >10 pg/g	[59,61,71]
	Ice cap	<1 ng/L 0.031 ng/mL	[59,61]

^aWithin 1.61 km of an airport.

^bWithin 25 km of a fluoropolymer production plant.

^cDirect industrial effluent.