- PWSID
- MN1820025
- State
- Minnesota
- System type
- community water system (CWS)
- Population served
- 82,643
- City
- Woodbury
- Counties
- Washington County
- Primary source water
- groundwater
- UCMR 5 sampling
- 2023-03-13 to 2024-12-17 · 12 entry point(s) · water types: GW
- Service-area boundary
- authoritative
PFOA ≥ 3 × its limit highest single result
PFOA ≥ 3 × its limit worst entry-point average
Open on the Minnesota map · All Minnesota systems · All results
These are monitoring results collected under EPA's Fifth Unregulated Contaminant Monitoring Rule (UCMR 5) at entry points, where treated water enters the distribution system; they are not tap-water samples. They are not compliance determinations: compliance with EPA's 2024 PFAS limits is judged on running annual averages of compliance monitoring, required from 2029, so a single UCMR 5 result at or above a limit is not a violation. “< MRL” means the compound was not quantified at EPA's minimum reporting level; it does not mean zero.
Water purchased from
- Oakdale (MN1820016)
Seller's highest results: PFOA <MRL · PFOS <MRL · HI 0 · detected: PFBA - Saint Paul Regional Water Services (MN1620026)
Seller's highest results: PFOA <MRL · PFOS <MRL · HI 0 · detected: PFBA;PFPeA
Seller results are the seller's own entry-point samples, not measurements of this system's water. This system's own samples (below) may reflect purchased water, its own sources, or both.
Compared with EPA's 2024 values
| Highest single result | Worst entry-point average* | Limit | |
|---|---|---|---|
| PFOA (ppt) | 17.1 | 12.85 | 4 |
| PFOS (ppt) | 8.4 | 4.85 | 4 |
| Hazard Index | 1.703 | 1.503 | 1.0† |
“<MRL” = every result for the compound was below its reporting limit. * Mean of all samples at each entry point with non-detects = 0 (EPA compliance convention; the Hazard Index also uses non-detects = 0); a screening comparison, not a formal running annual average. † Rescission proposed May 2026. PFOA/PFOS MCL 4 ppt (2024 NPDWR, in effect). PFHxS, PFNA, HFPO-DA (10 ppt each) and the Hazard Index (1.0) are 2024 NPDWR values; EPA proposed rescinding them on 18 May 2026 (comment period closed 20 Jul 2026).
Compared with Minnesota guidance levels
| Highest single result | Worst entry-point average* | Minnesota | |
|---|---|---|---|
| PFOA (ppt) | 17.1 | 12.85 | 0.01 (guidance) |
| PFOS (ppt) | 8.4 | 4.85 | 2.3 (guidance) |
| PFHxS (ppt) | 17 | 15 | 47 (guidance) |
| PFBS (ppt) | 6.7 | 6.45 | 100 (guidance) |
| PFHxA (ppt) | 7.2 | 7.05 | 200 (guidance) |
| PFBA (ppt) | 386 | 331.5 | 7,000 (guidance) |
Sum standards add the listed compounds within each sample (non-detects = 0). State compliance is normally judged on averages over time; these are screening comparisons.
Sampling history
Sampled 2023-03-13 to 2024-12-17 · 12 entry point(s) · water types: GW · 40 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2023-03-13 | TREATMENT PLANT #1 (GW) | SE1 | <4 | <4 | 0 | PFBA 82.5 |
| 2023-03-13 | Well #10 Entry Point (GW) | SE1 | 6.9 | <4 | 0 | PFBA 262, PFPeA 8.8 |
| 2023-03-13 | Well #11 Entry Point (GW) | SE1 | 17.1 | 8.4 | 0 | PFBA 199, PFHxA 6.5, PFPeA 8.6 |
| 2023-03-13 | Well #2 Entry Point (GW) | SE1 | 7.6 | <4 | 1.303 | PFBA 299, PFHxA 6.9, PFPeA 16.4 |
| 2023-03-13 | Well #8 Entry Point (GW) | SE1 | 9.7 | <4 | 0.522 | PFBA 253, PFHxA 5.8, PFPeA 14.2 |
| 2023-03-14 | TREATMENT PLANT #1 (GW) | SE1 | n/a | n/a | n/a | none |
| 2023-03-14 | Well #10 Entry Point (GW) | SE1 | n/a | n/a | n/a | none |
| 2023-03-14 | Well #11 Entry Point (GW) | SE1 | n/a | n/a | n/a | none |
| 2023-03-14 | Well #12 Entry Point (GW) | SE1 | 8.6 | 4 | 0.533 | PFBA 238, PFHxA 4.9, PFPeA 12.3 |
| 2023-03-14 | Well #14 Entry Point (GW) | SE1 | 8.7 | 5.5 | 0.002 | PFBA 263, PFHxA 3.5, PFPeA 9.2 |
| 2023-03-14 | Well #16 Entry Point (GW) | SE1 | 5.7 | <4 | 0.002 | PFBA 279, PFHxA 5.7, PFPeA 17.2 |
| 2023-03-14 | Well #18 Entry Point (GW) | SE1 | <4 | <4 | 0 | PFBA 194, PFPeA 6.3 |
| 2023-03-14 | Well #19 Entry Point (GW) | SE1 | 13.9 | <4 | 0.003 | PFBA 212, PFHxA 6.6, PFPeA 15.4 |
| 2023-03-14 | Well #2 Entry Point (GW) | SE1 | n/a | n/a | n/a | none |
| 2023-03-14 | Well #8 Entry Point (GW) | SE1 | n/a | n/a | n/a | none |
| 2023-06-07 | Well #15 Entry Point (GW) | SE1 | n/a | n/a | n/a | none |
| 2023-09-07 | Well #11 Entry Point (GW) | SE2 | 5.9 | <4 | 0.002 | PFBA 233, PFPeA 6.3 |
| 2023-09-07 | Well #12 Entry Point (GW) | SE2 | 11.1 | 5.7 | 0 | PFBA 153, PFHxA 4.5, PFPeA 6.4 |
| 2023-09-07 | Well #14 Entry Point (GW) | SE2 | 8.3 | <4 | 0.492 | PFHxA 4.6, PFPeA 10.8 |
| 2023-09-07 | Well #15 Entry Point (GW) | SE2 | 4.3 | <4 | 0 | PFHxA 3.1, PFPeA 9.5 |
| 2023-09-07 | Well #16 Entry Point (GW) | SE2 | 5.6 | <4 | 0.002 | PFHxA 5.6, PFPeA 16.1 |
| 2023-09-07 | Well #18 Entry Point (GW) | SE2 | <4 | <4 | 0 | PFBA 267, PFPeA 9.4 |
| 2023-09-19 | TREATMENT PLANT #1 (GW) | SE2 | n/a | n/a | n/a | none |
| 2023-09-19 | Well #10 Entry Point (GW) | SE2 | 5.8 | <4 | 0.301 | PFHxA 3.6, PFPeA 10.1 |
| 2023-09-19 | Well #19 Entry Point (GW) | SE2 | 11.8 | <4 | 0.002 | PFHxA 5.9, PFPeA 13.5 |
| 2023-09-19 | Well #2 Entry Point (GW) | SE2 | 8.2 | <4 | 1.703 | PFHxA 7.2, PFPeA 16.1 |
| 2023-09-19 | Well #8 Entry Point (GW) | SE2 | 8.6 | <4 | 0.442 | PFHxA 5, PFPeA 12 |
| 2024-02-06 | TREATMENT PLANT #1 (GW) | SE2 | <4 | <4 | 0 | PFBA 386 |
| 2024-02-06 | Well #10 Entry Point (GW) | SE2 | n/a | n/a | n/a | PFBA 365 |
| 2024-02-06 | Well #19 Entry Point (GW) | SE2 | n/a | n/a | n/a | PFBA 220 |
| 2024-02-06 | Well #2 Entry Point (GW) | SE2 | n/a | n/a | n/a | PFBA 364 |
| 2024-02-06 | Well #8 Entry Point (GW) | SE2 | n/a | n/a | n/a | PFBA 302 |
| 2024-05-28 | Well #15 Entry Point (GW) | SE1 | 5 | <4 | 0 | PFHxA 3.2, PFPeA 9.6 |
| 2024-05-28 | Well #20 (GW) | SE1 | 4 | <4 | 0 | PFBA 164, PFPeA 6.6 |
| 2024-09-11 | Well #14 Entry Point (GW) | SE2 | n/a | n/a | n/a | PFBA 293 |
| 2024-09-11 | Well #15 Entry Point (GW) | SE2 | n/a | n/a | n/a | PFBA 323 |
| 2024-09-11 | Well #20 (GW) | SE1 | n/a | n/a | n/a | none |
| 2024-10-08 | Well #20 (GW) | SE2 | <4 | <4 | 0 | PFBA 152, PFPeA 5.7 |
| 2024-12-17 | Well #15 Entry Point (GW) | SE1 | n/a | n/a | n/a | PFBA 19.9 |
| 2024-12-17 | Well #16 Entry Point (GW) | SE2 | n/a | n/a | n/a | PFBA 197 |
“<4” = not detected at the reporting limit shown; “n/a” = not analyzed in that sample. Highlighted = at or above the 4 ppt MCL. HI computed per sample with non-detects as 0. Other detections lists every other quantified compound (lithium in µg/L).
All results by entry point
720 results. Each column is one sampling visit (date and UCMR 5 sample event). A number is a measured concentration; “< 4” = below the minimum reporting level shown; “–” = not analyzed in that visit. PFAS in ppt (ng/L); lithium in µg/L.
TREATMENT PLANT #1 facility 64 · sample point E21 · groundwater
| Compound | MRL | 2023-03-13 SE1 | 2023-03-14 SE1 | 2023-09-19 SE2 | 2024-02-06 SE2 |
|---|---|---|---|---|---|
| PFBA | 5 ppt | 82.5 | – | – | 386 |
| 11Cl-PF3OUdS | 5 ppt | < 5 | – | – | < 5 |
| 4:2 FTS | 3 ppt | < 3 | – | – | < 3 |
| 6:2 FTS | 5 ppt | < 5 | – | – | < 5 |
| 8:2 FTS | 5 ppt | < 5 | – | – | < 5 |
| 9Cl-PF3ONS | 2 ppt | < 2 | – | – | < 2 |
| ADONA | 3 ppt | < 3 | – | – | < 3 |
| HFPO-DA | 5 ppt | < 5 | – | – | < 5 |
| NEtFOSAA | 5 ppt | < 5 | – | < 5 | – |
| NFDHA | 20 ppt | < 20 | – | – | < 20 |
| NMeFOSAA | 6 ppt | < 6 | – | < 6 | – |
| PFBS | 3 ppt | < 3 | – | – | < 3 |
| PFDA | 3 ppt | < 3 | – | – | < 3 |
| PFDoA | 3 ppt | < 3 | – | – | < 3 |
| PFEESA | 3 ppt | < 3 | – | – | < 3 |
| PFHpA | 3 ppt | < 3 | – | – | < 3 |
| PFHpS | 3 ppt | < 3 | – | – | < 3 |
| PFHxA | 3 ppt | < 3 | – | – | < 3 |
| PFHxS | 3 ppt | < 3 | – | – | < 3 |
| PFMBA | 3 ppt | < 3 | – | – | < 3 |
| PFMPA | 4 ppt | < 4 | – | – | < 4 |
| PFNA | 4 ppt | < 4 | – | – | < 4 |
| PFOA | 4 ppt | < 4 | – | – | < 4 |
| PFOS | 4 ppt | < 4 | – | – | < 4 |
| PFPeA | 3 ppt | < 3 | – | – | < 3 |
| PFPeS | 4 ppt | < 4 | – | – | < 4 |
| PFTA | 8 ppt | < 8 | – | < 8 | – |
| PFTrDA | 7 ppt | < 7 | – | < 7 | – |
| PFUnA | 2 ppt | < 2 | – | – | < 2 |
| lithium | 9 µg/L | – | < 9 | < 9 | – |
Well #10 Entry Point facility 14 · sample point E10 · groundwater
| Compound | MRL | 2023-03-13 SE1 | 2023-03-14 SE1 | 2023-09-19 SE2 | 2024-02-06 SE2 |
|---|---|---|---|---|---|
| PFBA | 5 ppt | 262 | – | – | 365 |
| PFBS | 3 ppt | < 3 | – | 3 | – |
| PFHxA | 3 ppt | < 3 | – | 3.6 | – |
| PFHxS | 3 ppt | < 3 | – | 3 | – |
| PFOA | 4 ppt | 6.9 | – | 5.8 | – |
| PFPeA | 3 ppt | 8.8 | – | 10.1 | – |
| 11Cl-PF3OUdS | 5 ppt | < 5 | – | < 5 | – |
| 4:2 FTS | 3 ppt | < 3 | – | < 3 | – |
| 6:2 FTS | 5 ppt | < 5 | – | < 5 | – |
| 8:2 FTS | 5 ppt | < 5 | – | < 5 | – |
| 9Cl-PF3ONS | 2 ppt | < 2 | – | < 2 | – |
| ADONA | 3 ppt | < 3 | – | < 3 | – |
| HFPO-DA | 5 ppt | < 5 | – | < 5 | – |
| NEtFOSAA | 5 ppt | < 5 | – | < 5 | – |
| NFDHA | 20 ppt | < 20 | – | < 20 | – |
| NMeFOSAA | 6 ppt | < 6 | – | < 6 | – |
| PFDA | 3 ppt | < 3 | – | < 3 | – |
| PFDoA | 3 ppt | < 3 | – | < 3 | – |
| PFEESA | 3 ppt | < 3 | – | < 3 | – |
| PFHpA | 3 ppt | < 3 | – | < 3 | – |
| PFHpS | 3 ppt | < 3 | – | < 3 | – |
| PFMBA | 3 ppt | < 3 | – | < 3 | – |
| PFMPA | 4 ppt | < 4 | – | < 4 | – |
| PFNA | 4 ppt | < 4 | – | < 4 | – |
| PFOS | 4 ppt | < 4 | – | < 4 | – |
| PFPeS | 4 ppt | < 4 | – | < 4 | – |
| PFTA | 8 ppt | < 8 | – | < 8 | – |
| PFTrDA | 7 ppt | < 7 | – | < 7 | – |
| PFUnA | 2 ppt | < 2 | – | < 2 | – |
| lithium | 9 µg/L | – | < 9 | < 9 | – |
Well #11 Entry Point facility 15 · sample point E11 · groundwater
| Compound | MRL | 2023-03-13 SE1 | 2023-03-14 SE1 | 2023-09-07 SE2 |
|---|---|---|---|---|
| PFBA | 5 ppt | 199 | – | 233 |
| PFBS | 3 ppt | < 3 | – | 3.5 |
| PFHxA | 3 ppt | 6.5 | – | < 3 |
| PFOA | 4 ppt | 17.1 | – | 5.9 |
| PFOS | 4 ppt | 8.4 | – | < 4 |
| PFPeA | 3 ppt | 8.6 | – | 6.3 |
| 11Cl-PF3OUdS | 5 ppt | < 5 | – | < 5 |
| 4:2 FTS | 3 ppt | < 3 | – | < 3 |
| 6:2 FTS | 5 ppt | < 5 | – | < 5 |
| 8:2 FTS | 5 ppt | < 5 | – | < 5 |
| 9Cl-PF3ONS | 2 ppt | < 2 | – | < 2 |
| ADONA | 3 ppt | < 3 | – | < 3 |
| HFPO-DA | 5 ppt | < 5 | – | < 5 |
| NEtFOSAA | 5 ppt | < 5 | – | < 5 |
| NFDHA | 20 ppt | < 20 | – | < 20 |
| NMeFOSAA | 6 ppt | < 6 | – | < 6 |
| PFDA | 3 ppt | < 3 | – | < 3 |
| PFDoA | 3 ppt | < 3 | – | < 3 |
| PFEESA | 3 ppt | < 3 | – | < 3 |
| PFHpA | 3 ppt | < 3 | – | < 3 |
| PFHpS | 3 ppt | < 3 | – | < 3 |
| PFHxS | 3 ppt | < 3 | – | < 3 |
| PFMBA | 3 ppt | < 3 | – | < 3 |
| PFMPA | 4 ppt | < 4 | – | < 4 |
| PFNA | 4 ppt | < 4 | – | < 4 |
| PFPeS | 4 ppt | < 4 | – | < 4 |
| PFTA | 8 ppt | < 8 | – | < 8 |
| PFTrDA | 7 ppt | < 7 | – | < 7 |
| PFUnA | 2 ppt | < 2 | – | < 2 |
| lithium | 9 µg/L | – | < 9 | < 9 |
Well #12 Entry Point facility 25 · sample point E12 · groundwater
| Compound | MRL | 2023-03-14 SE1 | 2023-09-07 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | 238 | 153 |
| PFBS | 3 ppt | 5.3 | < 3 |
| PFHxA | 3 ppt | 4.9 | 4.5 |
| PFHxS | 3 ppt | 5.3 | < 3 |
| PFOA | 4 ppt | 8.6 | 11.1 |
| PFOS | 4 ppt | 4 | 5.7 |
| PFPeA | 3 ppt | 12.3 | 6.4 |
| 11Cl-PF3OUdS | 5 ppt | < 5 | < 5 |
| 4:2 FTS | 3 ppt | < 3 | < 3 |
| 6:2 FTS | 5 ppt | < 5 | < 5 |
| 8:2 FTS | 5 ppt | < 5 | < 5 |
| 9Cl-PF3ONS | 2 ppt | < 2 | < 2 |
| ADONA | 3 ppt | < 3 | < 3 |
| HFPO-DA | 5 ppt | < 5 | < 5 |
| NEtFOSAA | 5 ppt | < 5 | < 5 |
| NFDHA | 20 ppt | < 20 | < 20 |
| NMeFOSAA | 6 ppt | < 6 | < 6 |
| PFDA | 3 ppt | < 3 | < 3 |
| PFDoA | 3 ppt | < 3 | < 3 |
| PFEESA | 3 ppt | < 3 | < 3 |
| PFHpA | 3 ppt | < 3 | < 3 |
| PFHpS | 3 ppt | < 3 | < 3 |
| PFMBA | 3 ppt | < 3 | < 3 |
| PFMPA | 4 ppt | < 4 | < 4 |
| PFNA | 4 ppt | < 4 | < 4 |
| PFPeS | 4 ppt | < 4 | < 4 |
| PFTA | 8 ppt | < 8 | < 8 |
| PFTrDA | 7 ppt | < 7 | < 7 |
| PFUnA | 2 ppt | < 2 | < 2 |
| lithium | 9 µg/L | < 9 | < 9 |
Well #14 Entry Point facility 43 · sample point E14 · groundwater
| Compound | MRL | 2023-03-14 SE1 | 2023-09-07 SE2 | 2024-09-11 SE2 |
|---|---|---|---|---|
| PFBA | 5 ppt | 263 | – | 293 |
| PFBS | 3 ppt | 4 | 4 | – |
| PFHxA | 3 ppt | 3.5 | 4.6 | – |
| PFHxS | 3 ppt | < 3 | 4.9 | – |
| PFOA | 4 ppt | 8.7 | 8.3 | – |
| PFOS | 4 ppt | 5.5 | < 4 | – |
| PFPeA | 3 ppt | 9.2 | 10.8 | – |
| 11Cl-PF3OUdS | 5 ppt | < 5 | < 5 | – |
| 4:2 FTS | 3 ppt | < 3 | < 3 | – |
| 6:2 FTS | 5 ppt | < 5 | < 5 | – |
| 8:2 FTS | 5 ppt | < 5 | < 5 | – |
| 9Cl-PF3ONS | 2 ppt | < 2 | < 2 | – |
| ADONA | 3 ppt | < 3 | < 3 | – |
| HFPO-DA | 5 ppt | < 5 | < 5 | – |
| NEtFOSAA | 5 ppt | < 5 | < 5 | – |
| NFDHA | 20 ppt | < 20 | < 20 | – |
| NMeFOSAA | 6 ppt | < 6 | < 6 | – |
| PFDA | 3 ppt | < 3 | < 3 | – |
| PFDoA | 3 ppt | < 3 | < 3 | – |
| PFEESA | 3 ppt | < 3 | < 3 | – |
| PFHpA | 3 ppt | < 3 | < 3 | – |
| PFHpS | 3 ppt | < 3 | < 3 | – |
| PFMBA | 3 ppt | < 3 | < 3 | – |
| PFMPA | 4 ppt | < 4 | < 4 | – |
| PFNA | 4 ppt | < 4 | < 4 | – |
| PFPeS | 4 ppt | < 4 | < 4 | – |
| PFTA | 8 ppt | < 8 | < 8 | – |
| PFTrDA | 7 ppt | < 7 | < 7 | – |
| PFUnA | 2 ppt | < 2 | < 2 | – |
| lithium | 9 µg/L | < 9 | < 9 | – |
Well #15 Entry Point facility 45 · sample point E16 · groundwater
| Compound | MRL | 2023-06-07 SE1 | 2023-09-07 SE2 | 2024-05-28 SE1 | 2024-09-11 SE2 | 2024-12-17 SE1 |
|---|---|---|---|---|---|---|
| PFBA | 5 ppt | – | – | – | 323 | 19.9 |
| PFHxA | 3 ppt | – | 3.1 | 3.2 | – | – |
| PFOA | 4 ppt | – | 4.3 | 5 | – | – |
| PFPeA | 3 ppt | – | 9.5 | 9.6 | – | – |
| 11Cl-PF3OUdS | 5 ppt | – | < 5 | < 5 | – | – |
| 4:2 FTS | 3 ppt | – | < 3 | < 3 | – | – |
| 6:2 FTS | 5 ppt | – | < 5 | < 5 | – | – |
| 8:2 FTS | 5 ppt | – | < 5 | < 5 | – | – |
| 9Cl-PF3ONS | 2 ppt | – | < 2 | < 2 | – | – |
| ADONA | 3 ppt | – | < 3 | < 3 | – | – |
| HFPO-DA | 5 ppt | – | < 5 | < 5 | – | – |
| NEtFOSAA | 5 ppt | < 5 | < 5 | – | – | – |
| NFDHA | 20 ppt | – | < 20 | < 20 | – | – |
| NMeFOSAA | 6 ppt | < 6 | < 6 | – | – | – |
| PFBS | 3 ppt | – | < 3 | < 3 | – | – |
| PFDA | 3 ppt | – | < 3 | < 3 | – | – |
| PFDoA | 3 ppt | – | < 3 | – | – | < 3 |
| PFEESA | 3 ppt | – | < 3 | < 3 | – | – |
| PFHpA | 3 ppt | – | < 3 | < 3 | – | – |
| PFHpS | 3 ppt | – | < 3 | < 3 | – | – |
| PFHxS | 3 ppt | – | < 3 | < 3 | – | – |
| PFMBA | 3 ppt | – | < 3 | < 3 | – | – |
| PFMPA | 4 ppt | – | < 4 | < 4 | – | – |
| PFNA | 4 ppt | – | < 4 | < 4 | – | – |
| PFOS | 4 ppt | – | < 4 | < 4 | – | – |
| PFPeS | 4 ppt | – | < 4 | < 4 | – | – |
| PFTA | 8 ppt | < 8 | < 8 | – | – | – |
| PFTrDA | 7 ppt | < 7 | < 7 | – | – | – |
| PFUnA | 2 ppt | – | < 2 | < 2 | – | – |
| lithium | 9 µg/L | < 9 | < 9 | – | – | – |
Well #16 Entry Point facility 53 · sample point E17 · groundwater
| Compound | MRL | 2023-03-14 SE1 | 2023-09-07 SE2 | 2024-12-17 SE2 |
|---|---|---|---|---|
| PFBA | 5 ppt | 279 | – | 197 |
| PFBS | 3 ppt | 3.3 | 3.1 | – |
| PFHxA | 3 ppt | 5.7 | 5.6 | – |
| PFOA | 4 ppt | 5.7 | 5.6 | – |
| PFPeA | 3 ppt | 17.2 | 16.1 | – |
| 11Cl-PF3OUdS | 5 ppt | < 5 | < 5 | – |
| 4:2 FTS | 3 ppt | < 3 | < 3 | – |
| 6:2 FTS | 5 ppt | < 5 | < 5 | – |
| 8:2 FTS | 5 ppt | < 5 | < 5 | – |
| 9Cl-PF3ONS | 2 ppt | < 2 | < 2 | – |
| ADONA | 3 ppt | < 3 | < 3 | – |
| HFPO-DA | 5 ppt | < 5 | < 5 | – |
| NEtFOSAA | 5 ppt | < 5 | < 5 | – |
| NFDHA | 20 ppt | < 20 | < 20 | – |
| NMeFOSAA | 6 ppt | < 6 | < 6 | – |
| PFDA | 3 ppt | < 3 | < 3 | – |
| PFDoA | 3 ppt | < 3 | < 3 | – |
| PFEESA | 3 ppt | < 3 | < 3 | – |
| PFHpA | 3 ppt | < 3 | < 3 | – |
| PFHpS | 3 ppt | < 3 | < 3 | – |
| PFHxS | 3 ppt | < 3 | < 3 | – |
| PFMBA | 3 ppt | < 3 | < 3 | – |
| PFMPA | 4 ppt | < 4 | < 4 | – |
| PFNA | 4 ppt | < 4 | < 4 | – |
| PFOS | 4 ppt | < 4 | < 4 | – |
| PFPeS | 4 ppt | < 4 | < 4 | – |
| PFTA | 8 ppt | < 8 | < 8 | – |
| PFTrDA | 7 ppt | < 7 | < 7 | – |
| PFUnA | 2 ppt | < 2 | < 2 | – |
| lithium | 9 µg/L | < 9 | < 9 | – |
Well #18 Entry Point facility 59 · sample point E19 · groundwater
| Compound | MRL | 2023-03-14 SE1 | 2023-09-07 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | 194 | 267 |
| PFPeA | 3 ppt | 6.3 | 9.4 |
| 11Cl-PF3OUdS | 5 ppt | < 5 | < 5 |
| 4:2 FTS | 3 ppt | < 3 | < 3 |
| 6:2 FTS | 5 ppt | < 5 | < 5 |
| 8:2 FTS | 5 ppt | < 5 | < 5 |
| 9Cl-PF3ONS | 2 ppt | < 2 | < 2 |
| ADONA | 3 ppt | < 3 | < 3 |
| HFPO-DA | 5 ppt | < 5 | < 5 |
| NEtFOSAA | 5 ppt | < 5 | < 5 |
| NFDHA | 20 ppt | < 20 | < 20 |
| NMeFOSAA | 6 ppt | < 6 | < 6 |
| PFBS | 3 ppt | < 3 | < 3 |
| PFDA | 3 ppt | < 3 | < 3 |
| PFDoA | 3 ppt | < 3 | < 3 |
| PFEESA | 3 ppt | < 3 | < 3 |
| PFHpA | 3 ppt | < 3 | < 3 |
| PFHpS | 3 ppt | < 3 | < 3 |
| PFHxA | 3 ppt | < 3 | < 3 |
| PFHxS | 3 ppt | < 3 | < 3 |
| PFMBA | 3 ppt | < 3 | < 3 |
| PFMPA | 4 ppt | < 4 | < 4 |
| PFNA | 4 ppt | < 4 | < 4 |
| PFOA | 4 ppt | < 4 | < 4 |
| PFOS | 4 ppt | < 4 | < 4 |
| PFPeS | 4 ppt | < 4 | < 4 |
| PFTA | 8 ppt | < 8 | < 8 |
| PFTrDA | 7 ppt | < 7 | < 7 |
| PFUnA | 2 ppt | < 2 | < 2 |
| lithium | 9 µg/L | < 9 | < 9 |
Well #19 Entry Point facility 61 · sample point E20 · groundwater
| Compound | MRL | 2023-03-14 SE1 | 2023-09-19 SE2 | 2024-02-06 SE2 |
|---|---|---|---|---|
| PFBA | 5 ppt | 212 | – | 220 |
| PFBS | 3 ppt | 5.4 | 4.8 | – |
| PFHxA | 3 ppt | 6.6 | 5.9 | – |
| PFOA | 4 ppt | 13.9 | 11.8 | – |
| PFPeA | 3 ppt | 15.4 | 13.5 | – |
| 11Cl-PF3OUdS | 5 ppt | < 5 | < 5 | – |
| 4:2 FTS | 3 ppt | < 3 | < 3 | – |
| 6:2 FTS | 5 ppt | < 5 | < 5 | – |
| 8:2 FTS | 5 ppt | < 5 | < 5 | – |
| 9Cl-PF3ONS | 2 ppt | < 2 | < 2 | – |
| ADONA | 3 ppt | < 3 | < 3 | – |
| HFPO-DA | 5 ppt | < 5 | < 5 | – |
| NEtFOSAA | 5 ppt | < 5 | < 5 | – |
| NFDHA | 20 ppt | < 20 | < 20 | – |
| NMeFOSAA | 6 ppt | < 6 | < 6 | – |
| PFDA | 3 ppt | < 3 | < 3 | – |
| PFDoA | 3 ppt | < 3 | < 3 | – |
| PFEESA | 3 ppt | < 3 | < 3 | – |
| PFHpA | 3 ppt | < 3 | < 3 | – |
| PFHpS | 3 ppt | < 3 | < 3 | – |
| PFHxS | 3 ppt | < 3 | < 3 | – |
| PFMBA | 3 ppt | < 3 | < 3 | – |
| PFMPA | 4 ppt | < 4 | < 4 | – |
| PFNA | 4 ppt | < 4 | < 4 | – |
| PFOS | 4 ppt | < 4 | < 4 | – |
| PFPeS | 4 ppt | < 4 | < 4 | – |
| PFTA | 8 ppt | < 8 | < 8 | – |
| PFTrDA | 7 ppt | < 7 | < 7 | – |
| PFUnA | 2 ppt | < 2 | < 2 | – |
| lithium | 9 µg/L | < 9 | < 9 | – |
Well #2 Entry Point facility 17 · sample point E02 · groundwater
| Compound | MRL | 2023-03-13 SE1 | 2023-03-14 SE1 | 2023-09-19 SE2 | 2024-02-06 SE2 |
|---|---|---|---|---|---|
| PFBA | 5 ppt | 299 | – | – | 364 |
| PFBS | 3 ppt | 6.2 | – | 6.7 | – |
| PFHxA | 3 ppt | 6.9 | – | 7.2 | – |
| PFHxS | 3 ppt | 13 | – | 17 | – |
| PFOA | 4 ppt | 7.6 | – | 8.2 | – |
| PFPeA | 3 ppt | 16.4 | – | 16.1 | – |
| 11Cl-PF3OUdS | 5 ppt | < 5 | – | < 5 | – |
| 4:2 FTS | 3 ppt | < 3 | – | < 3 | – |
| 6:2 FTS | 5 ppt | < 5 | – | < 5 | – |
| 8:2 FTS | 5 ppt | < 5 | – | < 5 | – |
| 9Cl-PF3ONS | 2 ppt | < 2 | – | < 2 | – |
| ADONA | 3 ppt | < 3 | – | < 3 | – |
| HFPO-DA | 5 ppt | < 5 | – | < 5 | – |
| NEtFOSAA | 5 ppt | < 5 | – | < 5 | – |
| NFDHA | 20 ppt | < 20 | – | < 20 | – |
| NMeFOSAA | 6 ppt | < 6 | – | < 6 | – |
| PFDA | 3 ppt | < 3 | – | < 3 | – |
| PFDoA | 3 ppt | < 3 | – | < 3 | – |
| PFEESA | 3 ppt | < 3 | – | < 3 | – |
| PFHpA | 3 ppt | < 3 | – | < 3 | – |
| PFHpS | 3 ppt | < 3 | – | < 3 | – |
| PFMBA | 3 ppt | < 3 | – | < 3 | – |
| PFMPA | 4 ppt | < 4 | – | < 4 | – |
| PFNA | 4 ppt | < 4 | – | < 4 | – |
| PFOS | 4 ppt | < 4 | – | < 4 | – |
| PFPeS | 4 ppt | < 4 | – | < 4 | – |
| PFTA | 8 ppt | < 8 | – | < 8 | – |
| PFTrDA | 7 ppt | < 7 | – | < 7 | – |
| PFUnA | 2 ppt | < 2 | – | < 2 | – |
| lithium | 9 µg/L | – | < 9 | < 9 | – |
Well #20 facility 00065 · sample point E22 · groundwater
| Compound | MRL | 2024-05-28 SE1 | 2024-09-11 SE1 | 2024-10-08 SE2 |
|---|---|---|---|---|
| PFBA | 5 ppt | 164 | – | 152 |
| PFOA | 4 ppt | 4 | – | < 4 |
| PFPeA | 3 ppt | 6.6 | – | 5.7 |
| 11Cl-PF3OUdS | 5 ppt | < 5 | – | < 5 |
| 4:2 FTS | 3 ppt | < 3 | – | < 3 |
| 6:2 FTS | 5 ppt | < 5 | – | < 5 |
| 8:2 FTS | 5 ppt | < 5 | – | < 5 |
| 9Cl-PF3ONS | 2 ppt | < 2 | – | < 2 |
| ADONA | 3 ppt | < 3 | – | < 3 |
| HFPO-DA | 5 ppt | < 5 | – | < 5 |
| NEtFOSAA | 5 ppt | – | < 5 | < 5 |
| NFDHA | 20 ppt | < 20 | – | < 20 |
| NMeFOSAA | 6 ppt | – | < 6 | < 6 |
| PFBS | 3 ppt | < 3 | – | < 3 |
| PFDA | 3 ppt | < 3 | – | < 3 |
| PFDoA | 3 ppt | – | < 3 | < 3 |
| PFEESA | 3 ppt | < 3 | – | < 3 |
| PFHpA | 3 ppt | < 3 | – | < 3 |
| PFHpS | 3 ppt | < 3 | – | < 3 |
| PFHxA | 3 ppt | < 3 | – | < 3 |
| PFHxS | 3 ppt | < 3 | – | < 3 |
| PFMBA | 3 ppt | < 3 | – | < 3 |
| PFMPA | 4 ppt | < 4 | – | < 4 |
| PFNA | 4 ppt | < 4 | – | < 4 |
| PFOS | 4 ppt | < 4 | – | < 4 |
| PFPeS | 4 ppt | < 4 | – | < 4 |
| PFTA | 8 ppt | – | < 8 | < 8 |
| PFTrDA | 7 ppt | – | < 7 | < 7 |
| PFUnA | 2 ppt | < 2 | – | < 2 |
| lithium | 9 µg/L | < 9 | – | < 9 |
Well #8 Entry Point facility 23 · sample point E08 · groundwater
| Compound | MRL | 2023-03-13 SE1 | 2023-03-14 SE1 | 2023-09-19 SE2 | 2024-02-06 SE2 |
|---|---|---|---|---|---|
| PFBA | 5 ppt | 253 | – | – | 302 |
| PFBS | 3 ppt | 3.9 | – | 3.3 | – |
| PFHxA | 3 ppt | 5.8 | – | 5 | – |
| PFHxS | 3 ppt | 5.2 | – | 4.4 | – |
| PFOA | 4 ppt | 9.7 | – | 8.6 | – |
| PFPeA | 3 ppt | 14.2 | – | 12 | – |
| 11Cl-PF3OUdS | 5 ppt | < 5 | – | < 5 | – |
| 4:2 FTS | 3 ppt | < 3 | – | < 3 | – |
| 6:2 FTS | 5 ppt | < 5 | – | < 5 | – |
| 8:2 FTS | 5 ppt | < 5 | – | < 5 | – |
| 9Cl-PF3ONS | 2 ppt | < 2 | – | < 2 | – |
| ADONA | 3 ppt | < 3 | – | < 3 | – |
| HFPO-DA | 5 ppt | < 5 | – | < 5 | – |
| NEtFOSAA | 5 ppt | < 5 | – | < 5 | – |
| NFDHA | 20 ppt | < 20 | – | < 20 | – |
| NMeFOSAA | 6 ppt | < 6 | – | < 6 | – |
| PFDA | 3 ppt | < 3 | – | < 3 | – |
| PFDoA | 3 ppt | < 3 | – | < 3 | – |
| PFEESA | 3 ppt | < 3 | – | < 3 | – |
| PFHpA | 3 ppt | < 3 | – | < 3 | – |
| PFHpS | 3 ppt | < 3 | – | < 3 | – |
| PFMBA | 3 ppt | < 3 | – | < 3 | – |
| PFMPA | 4 ppt | < 4 | – | < 4 | – |
| PFNA | 4 ppt | < 4 | – | < 4 | – |
| PFOS | 4 ppt | < 4 | – | < 4 | – |
| PFPeS | 4 ppt | < 4 | – | < 4 | – |
| PFTA | 8 ppt | < 8 | – | < 8 | – |
| PFTrDA | 7 ppt | < 7 | – | < 7 | – |
| PFUnA | 2 ppt | < 2 | – | < 2 | – |
| lithium | 9 µg/L | – | < 9 | < 9 | – |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| PFBA | 24 | 100% | 386 2024-02-06 | 238.35–238.35 | 238 | 293 | 364 | 365 |
| PFPeA | 24 | 92% | 17.2 2023-03-14 | 10.02–10.27 | 9.5 | 13.5 | 16.1 | 16.4 |
| PFOA | 24 | 79% | 17.1 2023-03-13 | 6.53–7.37 | 5.9 | 8.6 | 11.8 | 13.9 |
| PFHxA | 24 | 67% | 7.2 2023-09-19 | 3.44–4.44 | 3.6 | 5.7 | 6.6 | 6.9 |
| PFBS | 24 | 54% | 6.7 2023-09-19 | 2.35–3.73 | 3 | 4 | 5.4 | 6.2 |
| PFHxS | 24 | 29% | 17 2023-09-19 | 2.2–4.33 | <MRL | 3 | 5.3 | 13 |
| PFOS | 24 | 17% | 8.4 2023-03-13 | 0.98–4.32 | <MRL | <MRL | 5.5 | 5.7 |
Never detected (23): 11Cl-PF3OUdS, 4:2 FTS, 6:2 FTS, 8:2 FTS, 9Cl-PF3ONS, ADONA, HFPO-DA, NEtFOSAA, NFDHA, NMeFOSAA, PFDA, PFDoA, PFEESA, PFHpA, PFHpS, PFMBA, PFMPA, PFNA, PFPeS, PFTA, PFTrDA, PFUnA, lithium.
Left-censored Kaplan–Meier statistics (Helsel 2005; Helsel & Lee 2006, NADA for R). Units: ppt; lithium µg/L. Each compound has one reporting limit, so the Kaplan–Meier mean equals the upper mean bound (non-detects at the MRL); the lower bound sets non-detects to 0. “<MRL” = the percentile falls below the reporting limit and cannot be estimated. These describe this system's UCMR 5 samples, not population estimates.
Sources
- EPA UCMR 5 occurrence data text files (UCMR5_All.txt; samples 2023-01-04 to 2026-02-23; data summary dated Jul 2026)
- EPA SDWIS via ECHO SDWA downloads, quarter 2026Q3
- EPA Public Water System Service Areas v3 (Mar 2026)
- US Census Bureau cartographic boundary counties 1:500k, 2024
- EPA/USGS NHDPlus V2 (medium resolution) flowlines, Strahler order 2+
Data build b4430eb8fd55 · 2026-10-18T04:07Z · UCMR 5 release Jul2026 · SDWIS 2026Q3. Data and methods.