Table 2.
Summary statistics for 30 PFAS in well water and blood serum samples from 84 private wells and 153 private well users in the GenX Exposure Study, February 2019.
| Well water (ng/L) | Serum (ng/mL) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| PFAS | MRL (ng/L) | n > MRL (%) | Median | Max | MRLa (ng/mL) | n > MRL (%) | Median | Max | |
| Perfluoroalkyl ether carboxylic acids (PFECAs) | PFMOAA | 10 | 62 (74) | 43 | 258 | NM | |||
| PMPA | 5 | 73 (87) | 342 | 1368 | 0.2–2 | 0 (0) | ND | ND | |
| PFO2HxA | 5 | 65 (77) | 107 | 835 | 0.1–4 | 11 (7) | ND | 0.2 | |
| PEPA | 2.5 | 69 (82) | 81 | 468 | NM | ||||
| PFO3OA | 2.5 | 53 (63) | 8 | 144 | 0.4–0.5 | 1 (1) | ND | 0.6 | |
| HFPO-DA (GenX) | 2.5 | 71 (85) | 107 | 918 | 0.4–2.5 | 0 (0) | ND | ND | |
| PFO4DA | 2.5 | 36 (43) | ND | 41 | 0.4–1 | 5 (3) | ND | 1.8 | |
| Hydro-EVE | 2.5 | 18 (21) | ND | 6 | 1 | 0 (0) | ND | ND | |
| PFO5DoA | 2.5 | 6 (7) | ND | 13 | 0.4–1 | 53 (35) | ND | 17.3 | |
| Polyfluoroalkyl ether sulfonic acids (PFESAs) | NVHOS | 2.5 | 59 (70) | 3 | 11 | 0.1–0.2 | 9 (6) | ND | 4.9 |
| Nafion byproduct 2 | 2.5 | 61 (73) | 14 | 165 | 0.1–0.4 | 85 (56) | 0.14 | 20.8 | |
| Perfluoroalkyl carboxylic acids (PFCAs) | PFBA | 5 | 56 (67) | 7 | 38 | NM | |||
| PFPeA | 2.5 | 55 (65) | 5 | 85 | 0.2–2 | 4 (3) | ND | 0.8 | |
| PFHxA | 2.5 | 37 (44) | ND | 60 | 0.1–0.2 | 10 (7) | ND | 5.1 | |
| PFHpA | 2.5 | 22 (26) | ND | 19 | 0.2 | 44 (29) | ND | 0.8 | |
| PFOA | 2.5 | 31 (37) | ND | 55 | 0.2–1 | 149 (97) | 2.7 | 17.2 | |
| PFNA | 2.5 | 1 (1) | ND | 4 | 0.2 | 151 (99) | 0.9 | 4.4 | |
| PFDA | 2.5 | 1 (1) | ND | 35 | 0.1–0.4 | 140 (92) | 0.51 | 4.0 | |
| PFUnDA | NM | 0.1–1 | 64 (42) | ND | 1.3 | ||||
| PFTrDA | NM | 0.2–10 | 6 (4) | ND | 0.6 | ||||
| Perfluoroalkyl sulfonic acids (PFSAs) | PFBS | 2.5 | 19 (23) | ND | 12 | 0.1–1 | 26 (17) | ND | 4.8 |
| PFPeS | 2.5 | 0 (0) | ND | ND | 0.1–0.2 | 26 (17) | ND | 0.4 | |
| PFHxS | 2.5 | 4 (5) | ND | 26 | 0.1–2 | 153 (100) | 3.1 | 23.5 | |
| PFHpS | 2.5 | 0 (0) | ND | ND | 0.1–0.2 | 145 (95) | 0.4 | 2.4 | |
| PFOS | 2.5 | 20 (24) | ND | 114 | 0.4–1 | 152 (99) | 9.3 | 72.3 | |
| PFNS | NM | 0.1–0.2 | 0 (0) | ND | ND | ||||
| PFDS | NM | 0.1–0.2 | 3 (2) | ND | 0.2 | ||||
| Fluorotelomer sulfonic acids (FTS) | 4:2 FTS | 2.5 | 0 (0) | ND | ND | 0.1–0.2 | 9 (6) | ND | 0.7 |
| 6:2 FTS | 5 | 0 (0) | ND | ND | 0.2 | 41 (27) | ND | 11.5 | |
| 8:2 FTS | 5 | 0 (0) | ND | ND | 0.1–0.2 | 6 (4) | ND | 0.3 | |
PFAS are listed in order of increasing average molecular weight within each chemical class.
NM not measured, ND not detected, MRL method reporting limit.
a
The range in MRL across four analytical batches is shown.