- PWSID
- NY2902830
- State
- New York
- System type
- community water system (CWS)
- Population served
- 120,000
- City
- New Hyde Park
- Counties
- Nassau County
- Primary source water
- groundwater
- UCMR 5 sampling
- 2023-06-13 to 2024-01-25 · 13 entry point(s) · water types: GW
- Service-area boundary
- authoritative
PFOA 1–3 × its limit highest single result
PFOA 1–3 × its limit worst entry-point average
Open on the New York map · All New York 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.
Compared with EPA's 2024 values
| Highest single result | Worst entry-point average* | Limit | |
|---|---|---|---|
| PFOA (ppt) | 10 | 5 | 4 |
| PFOS (ppt) | 6.1 | 3.05 | 4 |
| Hazard Index | 0.45 | 0.225 | 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 New York standards
| Highest single result | Worst entry-point average* | New York | |
|---|---|---|---|
| PFOA (ppt) | 10 | 5 | 10 |
| PFOS (ppt) | 6.1 | 3.05 | 10 |
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 2023-06-13 to 2024-01-25 · 13 entry point(s) · water types: GW · 29 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2023-06-13 | Well 15C & 15E Treatment (GW) | SE1 | <4 | <4 | 0 | none |
| 2023-06-13 | Well 25A Treatment (GW) | SE1 | <4 | <4 | 0 | none |
| 2023-06-13 | Well 28 Treatment (GW) | SE1 | <4 | <4 | 0 | PFBA 5.8, PFHxA 4.9, PFPeA 8 |
| 2023-06-13 | Well 28A & 28B Treatment (GW) | SE1 | <4 | <4 | 0 | none |
| 2023-06-13 | Well 30 Treatment (GW) | SE1 | <4 | <4 | 0 | none |
| 2023-06-13 | Well 44 & 44A Treatment (GW) | SE1 | 6 | <4 | 0.002 | PFHpA 3.3, PFHxA 7.3, PFPeA 9.5 |
| 2023-06-13 | Well 44B & 44C Treatment (GW) | SE1 | 6.3 | <4 | 0.002 | PFHpA 3.4, PFHxA 7.3, PFPeA 8.6 |
| 2023-06-15 | Well 15A & 15B Treatment (GW) | SE1 | 4.6 | <4 | 0.002 | PFBA 5.6, PFHpA 3.2, PFHxA 7.4, PFPeA 9.1 |
| 2023-06-15 | Well 16A Treatment (GW) | SE1 | <4 | <4 | 0 | none |
| 2023-06-15 | Well 35 & 35A Treatment (GW) | SE1 | 10 | 5.8 | 0.45 | PFBA 5, PFHpA 3.4, PFHxA 5, PFPeA 4.8 |
| 2023-06-15 | Well 40 & 40A Treatment (GW) | SE1 | <4 | <4 | 0 | PFBA 7.1 |
| 2023-06-29 | Well 20 Treatment (GW) | SE1 | <4 | <4 | 0 | none |
| 2023-06-29 | Well 57 & 57A Treatment (GW) | SE1 | <4 | <4 | 0 | none |
| 2023-07-20 | Well 35 & 35A Treatment (GW) | SE1 | n/a | n/a | n/a | none |
| 2023-07-20 | Well 40 & 40A Treatment (GW) | SE1 | n/a | n/a | n/a | none |
| 2023-12-05 | Well 15C & 15E Treatment (GW) | SE2 | <4 | <4 | 0 | none |
| 2023-12-05 | Well 25A Treatment (GW) | SE2 | <4 | <4 | 0 | none |
| 2023-12-05 | Well 28 Treatment (GW) | SE2 | <4 | <4 | 0 | none |
| 2023-12-05 | Well 28A & 28B Treatment (GW) | SE2 | <4 | <4 | 0 | none |
| 2023-12-05 | Well 30 Treatment (GW) | SE2 | <4 | <4 | 0 | none |
| 2023-12-05 | Well 44 & 44A Treatment (GW) | SE2 | <4 | <4 | 0 | none |
| 2023-12-05 | Well 44B & 44C Treatment (GW) | SE2 | <4 | <4 | 0 | none |
| 2023-12-07 | Well 15A & 15B Treatment (GW) | SE2 | <4 | <4 | 0 | none |
| 2023-12-07 | Well 16A Treatment (GW) | SE2 | <4 | <4 | 0 | none |
| 2023-12-07 | Well 20 Treatment (GW) | SE2 | <4 | <4 | 0 | none |
| 2023-12-07 | Well 35 & 35A Treatment (GW) | SE2 | <4 | <4 | 0 | none |
| 2023-12-07 | Well 40 & 40A Treatment (GW) | SE2 | n/a | n/a | n/a | none |
| 2023-12-07 | Well 57 & 57A Treatment (GW) | SE2 | <4 | <4 | 0 | none |
| 2024-01-25 | Well 40 & 40A Treatment (GW) | SE2 | 10 | 6.1 | 0.41 | PFHpA 3.1, PFHxA 4, PFPeA 4.2 |
“<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
780 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.
Well 15A & 15B Treatment facility N09151 · sample point AS15A15B · groundwater
| Compound | MRL | 2023-06-15 SE1 | 2023-12-07 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | 5.6 | < 5 |
| PFBS | 3 ppt | 3.4 | < 3 |
| PFHpA | 3 ppt | 3.2 | < 3 |
| PFHxA | 3 ppt | 7.4 | < 3 |
| PFOA | 4 ppt | 4.6 | < 4 |
| PFPeA | 3 ppt | 9.1 | < 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 |
| 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 15C & 15E Treatment facility N10206 · sample point AS15C15E · groundwater
| Compound | MRL | 2023-06-13 SE1 | 2023-12-05 SE2 |
|---|---|---|---|
| 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 |
| PFBA | 5 ppt | < 5 | < 5 |
| 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 16A Treatment facility N01958 · sample point N01958T · groundwater
| Compound | MRL | 2023-06-15 SE1 | 2023-12-07 SE2 |
|---|---|---|---|
| 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 |
| PFBA | 5 ppt | < 5 | < 5 |
| 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 20 Treatment facility N00017 · sample point ASGAC00017 · groundwater
| Compound | MRL | 2023-06-29 SE1 | 2023-12-07 SE2 |
|---|---|---|---|
| 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 |
| PFBA | 5 ppt | < 5 | < 5 |
| 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 25A Treatment facility N07482 · sample point IF07482 · groundwater
| Compound | MRL | 2023-06-13 SE1 | 2023-12-05 SE2 |
|---|---|---|---|
| 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 |
| PFBA | 5 ppt | < 5 | < 5 |
| 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 28 Treatment facility N02414 · sample point GAC02414 · groundwater
| Compound | MRL | 2023-06-13 SE1 | 2023-12-05 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | 5.8 | < 5 |
| PFHxA | 3 ppt | 4.9 | < 3 |
| PFPeA | 3 ppt | 8 | < 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 |
| 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 |
| 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 28A & 28B Treatment facility N10211 · sample point IF28A28B · groundwater
| Compound | MRL | 2023-06-13 SE1 | 2023-12-05 SE2 |
|---|---|---|---|
| 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 |
| PFBA | 5 ppt | < 5 | < 5 |
| 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 30 Treatment facility N03720 · sample point IF03720 · groundwater
| Compound | MRL | 2023-06-13 SE1 | 2023-12-05 SE2 |
|---|---|---|---|
| 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 |
| PFBA | 5 ppt | < 5 | < 5 |
| 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 35 & 35A Treatment facility N04298 · sample point AOPAS3535A · groundwater
| Compound | MRL | 2023-06-15 SE1 | 2023-07-20 SE1 | 2023-12-07 SE2 |
|---|---|---|---|---|
| PFBA | 5 ppt | 5 | – | < 5 |
| PFHpA | 3 ppt | 3.4 | – | < 3 |
| PFHxA | 3 ppt | 5 | – | < 3 |
| PFHxS | 3 ppt | 4.5 | – | < 3 |
| PFOA | 4 ppt | 10 | – | < 4 |
| PFOS | 4 ppt | 5.8 | – | < 4 |
| PFPeA | 3 ppt | 4.8 | – | < 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 |
| PFBS | 3 ppt | < 3 | – | < 3 |
| PFDA | 3 ppt | < 3 | – | < 3 |
| PFDoA | 3 ppt | < 3 | – | < 3 |
| PFEESA | 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 40 & 40A Treatment facility N04390 · sample point AS07445 · groundwater
| Compound | MRL | 2023-06-15 SE1 | 2023-07-20 SE1 | 2023-12-07 SE2 | 2024-01-25 SE2 |
|---|---|---|---|---|---|
| PFBA | 5 ppt | 7.1 | – | – | < 5 |
| PFHpA | 3 ppt | < 3 | – | – | 3.1 |
| PFHxA | 3 ppt | < 3 | – | – | 4 |
| PFHxS | 3 ppt | < 3 | – | – | 4.1 |
| PFOA | 4 ppt | < 4 | – | – | 10 |
| PFOS | 4 ppt | < 4 | – | – | 6.1 |
| PFPeA | 3 ppt | < 3 | – | – | 4.2 |
| 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 |
| 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 44 & 44A Treatment facility N05155 · sample point ASGAC4444A · groundwater
| Compound | MRL | 2023-06-13 SE1 | 2023-12-05 SE2 |
|---|---|---|---|
| PFBS | 3 ppt | 3.6 | < 3 |
| PFHpA | 3 ppt | 3.3 | < 3 |
| PFHxA | 3 ppt | 7.3 | < 3 |
| PFOA | 4 ppt | 6 | < 4 |
| PFPeA | 3 ppt | 9.5 | < 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 |
| PFBA | 5 ppt | < 5 | < 5 |
| PFDA | 3 ppt | < 3 | < 3 |
| PFDoA | 3 ppt | < 3 | < 3 |
| PFEESA | 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 44B & 44C Treatment facility N06744 · sample point ASGAC44B44C · groundwater
| Compound | MRL | 2023-06-13 SE1 | 2023-12-05 SE2 |
|---|---|---|---|
| PFBS | 3 ppt | 3.5 | < 3 |
| PFHpA | 3 ppt | 3.4 | < 3 |
| PFHxA | 3 ppt | 7.3 | < 3 |
| PFOA | 4 ppt | 6.3 | < 4 |
| PFPeA | 3 ppt | 8.6 | < 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 |
| PFBA | 5 ppt | < 5 | < 5 |
| PFDA | 3 ppt | < 3 | < 3 |
| PFDoA | 3 ppt | < 3 | < 3 |
| PFEESA | 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 57 & 57A Treatment facility N07649 · sample point AOPAS5757A · groundwater
| Compound | MRL | 2023-06-29 SE1 | 2023-12-07 SE2 |
|---|---|---|---|
| 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 |
| PFBA | 5 ppt | < 5 | < 5 |
| 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 |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| PFHxA | 26 | 23% | 7.4 2023-06-15 | 1.38–3.69 | <MRL | <MRL | 7.3 | 7.3 |
| PFPeA | 26 | 23% | 9.5 2023-06-13 | 1.7–4.01 | <MRL | <MRL | 8.6 | 9.1 |
| PFHpA | 26 | 19% | 3.4 2023-06-13 | 0.63–3.05 | <MRL | <MRL | 3.3 | 3.4 |
| PFOA | 26 | 19% | 10 2023-06-15 | 1.42–4.65 | <MRL | <MRL | 6.3 | 10 |
| PFBA | 26 | 15% | 7.1 2023-06-15 | 0.9–5.13 | <MRL | <MRL | 5.6 | 5.8 |
| PFBS | 26 | 12% | 3.6 2023-06-13 | 0.4–3.06 | <MRL | <MRL | 3.4 | 3.5 |
| PFHxS | 26 | 8% | 4.5 2023-06-15 | 0.33–3.1 | <MRL | <MRL | <MRL | 4.1 |
| PFOS | 26 | 8% | 6.1 2024-01-25 | 0.46–4.15 | <MRL | <MRL | <MRL | 5.8 |
Never detected (22): 11Cl-PF3OUdS, 4:2 FTS, 6:2 FTS, 8:2 FTS, 9Cl-PF3ONS, ADONA, HFPO-DA, NEtFOSAA, NFDHA, NMeFOSAA, PFDA, PFDoA, PFEESA, 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 2023-01-03 to 2026-06-17; 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 171ad949e257 · 2026-10-18T04:10Z · UCMR 5 release Jul2026 · SDWIS 2026Q3. Data and methods.