- PWSID
- PA1090082
- State
- Pennsylvania
- System type
- community water system (CWS)
- Population served
- 12,800
- City
- Quakertown
- Counties
- Bucks County
- Primary source water
- groundwater
- UCMR 5 sampling
- 2025-02-12 to 2025-09-04 · 8 entry point(s) · water types: GW
- Service-area boundary
- authoritative
PFOS ≥ 3 × its limit highest single result
PFOS ≥ 3 × its limit worst entry-point average
Open on the Pennsylvania map · All Pennsylvania 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) | 10.8 | 10.8 | 4 |
| PFOS (ppt) | 14.3 | 14.3 | 4 |
| Hazard Index | 2.71 | 1.356 | 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 Pennsylvania standards
| Highest single result | Worst entry-point average* | Pennsylvania | |
|---|---|---|---|
| PFOA (ppt) | 10.8 | 10.8 | 14 |
| PFOS (ppt) | 14.3 | 14.3 | 18 |
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 2025-02-12 to 2025-09-04 · 8 entry point(s) · water types: GW · 16 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2025-02-12 | Well #11 Treatment (GW) | SE1 | 4.5 | 6.6 | 0.002 | lithium 21.8 µg/L |
| 2025-02-12 | Well #12 Treatment (GW) | SE1 | 5.5 | 6 | 0.002 | PFBA 5.5, PFHxA 6, PFPeA 8.3, lithium 17.8 µg/L |
| 2025-02-12 | Well #13 Treatment (GW) | SE1 | 7.4 | 11.8 | 0.002 | lithium 80.4 µg/L |
| 2025-02-12 | Well #14 Treatment (GW) | SE1 | 4.1 | 8.9 | 2.38 | lithium 16.6 µg/L |
| 2025-02-12 | Well #15 Treatment (GW) | SE1 | <4 | 5.5 | 0.003 | lithium 15.9 µg/L |
| 2025-02-12 | Well #19 Treatment (GW) | SE1 | <4 | <4 | 0 | lithium 16 µg/L |
| 2025-02-12 | Wells #10 & #17 Treatment (GW) | SE1 | n/a | n/a | n/a | lithium 21.1 µg/L |
| 2025-02-12 | Wells #7 - #9 Treatment (GW) | SE1 | <4 | 4.7 | 0 | lithium 16.7 µg/L |
| 2025-08-05 | Well #12 Treatment (GW) | SE2 | <4 | 4.2 | 0 | lithium 14.2 µg/L |
| 2025-08-05 | Well #14 Treatment (GW) | SE2 | 5.3 | 7.2 | 0.002 | PFHxA 3, PFPeA 3.1, lithium 18.3 µg/L |
| 2025-08-05 | Well #15 Treatment (GW) | SE2 | 6.8 | 7.4 | 0.003 | PFBA 7.1, PFHxA 6.1, PFPeA 8, lithium 17.6 µg/L |
| 2025-08-05 | Well #19 Treatment (GW) | SE2 | 4.8 | 7.8 | 0.003 | PFHxA 3.2, PFPeA 3.1, lithium 13.9 µg/L |
| 2025-09-02 | Well #11 Treatment (GW) | SE2 | n/a | n/a | n/a | lithium 20.6 µg/L |
| 2025-09-02 | Wells #7 - #9 Treatment (GW) | SE2 | <4 | <4 | 0 | lithium 16.4 µg/L |
| 2025-09-04 | Well #13 Treatment (GW) | SE2 | 4.7 | 8.9 | 2.71 | PFPeA 3.8, lithium 14.4 µg/L |
| 2025-09-04 | Wells #10 & #17 Treatment (GW) | SE2 | 10.8 | 14.3 | 0.302 | PFBA 5.1, PFHxA 3.1, PFPeA 3.4, lithium 73.1 µg/L |
“<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
430 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 #11 Treatment facility 00103 · sample point 103 · groundwater
| Compound | MRL | 2025-02-12 SE1 | 2025-09-02 SE2 |
|---|---|---|---|
| PFBS | 3 ppt | 3.4 | – |
| PFOA | 4 ppt | 4.5 | – |
| PFOS | 4 ppt | 6.6 | – |
| 11Cl-PF3OUdS | 5 ppt | < 5 | – |
| 4:2 FTS | 3 ppt | < 3 | – |
| 6:2 FTS | 5 ppt | < 5 | – |
| 8:2 FTS | 5 ppt | < 5 | – |
| 9Cl-PF3ONS | 2 ppt | < 2 | – |
| ADONA | 3 ppt | < 3 | – |
| HFPO-DA | 5 ppt | < 5 | – |
| NEtFOSAA | 5 ppt | < 5 | < 5 |
| NFDHA | 20 ppt | < 20 | – |
| NMeFOSAA | 6 ppt | < 6 | < 6 |
| PFBA | 5 ppt | < 5 | – |
| PFDA | 3 ppt | < 3 | – |
| PFDoA | 3 ppt | < 3 | – |
| PFEESA | 3 ppt | < 3 | – |
| PFHpA | 3 ppt | < 3 | – |
| PFHpS | 3 ppt | < 3 | – |
| PFHxA | 3 ppt | < 3 | – |
| PFHxS | 3 ppt | < 3 | – |
| PFMBA | 3 ppt | < 3 | – |
| PFMPA | 4 ppt | < 4 | – |
| PFNA | 4 ppt | < 4 | – |
| PFPeA | 3 ppt | < 3 | – |
| PFPeS | 4 ppt | < 4 | – |
| PFTA | 8 ppt | < 8 | < 8 |
| PFTrDA | 7 ppt | < 7 | < 7 |
| PFUnA | 2 ppt | < 2 | – |
| lithium | 9 µg/L | 21.8 | 20.6 |
Well #12 Treatment facility 00104 · sample point 104 · groundwater
| Compound | MRL | 2025-02-12 SE1 | 2025-08-05 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | 5.5 | < 5 |
| PFBS | 3 ppt | 4.6 | < 3 |
| PFHxA | 3 ppt | 6 | < 3 |
| PFOA | 4 ppt | 5.5 | < 4 |
| PFOS | 4 ppt | 6 | 4.2 |
| PFPeA | 3 ppt | 8.3 | < 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 | 17.8 | 14.2 |
Well #13 Treatment facility 00105 · sample point 105 · groundwater
| Compound | MRL | 2025-02-12 SE1 | 2025-09-04 SE2 |
|---|---|---|---|
| PFBS | 3 ppt | 3.1 | < 3 |
| PFHxS | 3 ppt | < 3 | 3.1 |
| PFNA | 4 ppt | < 4 | 24 |
| PFOA | 4 ppt | 7.4 | 4.7 |
| PFOS | 4 ppt | 11.8 | 8.9 |
| PFPeA | 3 ppt | < 3 | 3.8 |
| 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 |
| PFBA | 5 ppt | < 5 | < 5 |
| 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 |
| PFMBA | 3 ppt | < 3 | < 3 |
| PFMPA | 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 | 80.4 | 14.4 |
Well #14 Treatment facility 00106 · sample point 106 · groundwater
| Compound | MRL | 2025-02-12 SE1 | 2025-08-05 SE2 |
|---|---|---|---|
| PFBS | 3 ppt | < 3 | 3.5 |
| PFHxA | 3 ppt | < 3 | 3 |
| PFNA | 4 ppt | 23.8 | < 4 |
| PFOA | 4 ppt | 4.1 | 5.3 |
| PFOS | 4 ppt | 8.9 | 7.2 |
| PFPeA | 3 ppt | < 3 | 3.1 |
| 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 |
| PFBA | 5 ppt | < 5 | < 5 |
| 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 |
| PFPeS | 4 ppt | < 4 | < 4 |
| PFTA | 8 ppt | < 8 | < 8 |
| PFTrDA | 7 ppt | < 7 | < 7 |
| PFUnA | 2 ppt | < 2 | < 2 |
| lithium | 9 µg/L | 16.6 | 18.3 |
Well #15 Treatment facility 00107 · sample point 107 · groundwater
| Compound | MRL | 2025-02-12 SE1 | 2025-08-05 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | < 5 | 7.1 |
| PFBS | 3 ppt | 6.5 | 5.3 |
| PFHxA | 3 ppt | < 3 | 6.1 |
| PFOA | 4 ppt | < 4 | 6.8 |
| PFOS | 4 ppt | 5.5 | 7.4 |
| PFPeA | 3 ppt | < 3 | 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 |
| 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 | 15.9 | 17.6 |
Well #19 Treatment facility 00108 · sample point 108 · groundwater
| Compound | MRL | 2025-02-12 SE1 | 2025-08-05 SE2 |
|---|---|---|---|
| PFBS | 3 ppt | < 3 | 6.8 |
| PFHxA | 3 ppt | < 3 | 3.2 |
| PFOA | 4 ppt | < 4 | 4.8 |
| PFOS | 4 ppt | < 4 | 7.8 |
| PFPeA | 3 ppt | < 3 | 3.1 |
| 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 |
| PFBA | 5 ppt | < 5 | < 5 |
| 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 | 16 | 13.9 |
Wells #10 & #17 Treatment facility 00102 · sample point 102 · groundwater
| Compound | MRL | 2025-02-12 SE1 | 2025-09-04 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | – | 5.1 |
| PFBS | 3 ppt | – | 4 |
| PFHxA | 3 ppt | – | 3.1 |
| PFHxS | 3 ppt | – | 3 |
| PFOA | 4 ppt | – | 10.8 |
| PFOS | 4 ppt | – | 14.3 |
| PFPeA | 3 ppt | – | 3.4 |
| 11Cl-PF3OUdS | 5 ppt | – | < 5 |
| 4:2 FTS | 3 ppt | – | < 3 |
| 6:2 FTS | 5 ppt | – | < 5 |
| 8:2 FTS | 5 ppt | – | < 5 |
| 9Cl-PF3ONS | 2 ppt | – | < 2 |
| ADONA | 3 ppt | – | < 3 |
| HFPO-DA | 5 ppt | – | < 5 |
| NEtFOSAA | 5 ppt | < 5 | < 5 |
| NFDHA | 20 ppt | – | < 20 |
| NMeFOSAA | 6 ppt | < 6 | < 6 |
| PFDA | 3 ppt | – | < 3 |
| PFDoA | 3 ppt | – | < 3 |
| PFEESA | 3 ppt | – | < 3 |
| PFHpA | 3 ppt | – | < 3 |
| PFHpS | 3 ppt | – | < 3 |
| PFMBA | 3 ppt | – | < 3 |
| PFMPA | 4 ppt | – | < 4 |
| PFNA | 4 ppt | – | < 4 |
| PFPeS | 4 ppt | – | < 4 |
| PFTA | 8 ppt | < 8 | < 8 |
| PFTrDA | 7 ppt | < 7 | < 7 |
| PFUnA | 2 ppt | – | < 2 |
| lithium | 9 µg/L | 21.1 | 73.1 |
Wells #7 - #9 Treatment facility 00101 · sample point 101 · groundwater
| Compound | MRL | 2025-02-12 SE1 | 2025-09-02 SE2 |
|---|---|---|---|
| PFOS | 4 ppt | 4.7 | < 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 |
| 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 |
| 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 | 16.7 | 16.4 |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| lithium | 16 | 100% | 80.4 2025-02-12 | 24.68–24.68 | 16.7 | 20.6 | 73.1 | 80.4 |
| PFOS | 14 | 86% | 14.3 2025-09-04 | 6.66–7.24 | 6.6 | 8.9 | 11.8 | 14.3 |
| PFOA | 14 | 64% | 10.8 2025-09-04 | 3.85–5.28 | 4.5 | 5.5 | 7.4 | 10.8 |
| PFBS | 14 | 57% | 6.8 2025-08-05 | 2.66–3.94 | 3.1 | 4.6 | 6.5 | 6.8 |
| PFPeA | 14 | 43% | 8.3 2025-02-12 | 2.12–3.84 | <MRL | 3.4 | 8 | 8.3 |
| PFHxA | 14 | 36% | 6.1 2025-08-05 | 1.53–3.46 | <MRL | 3.1 | 6 | 6.1 |
| PFBA | 14 | 21% | 7.1 2025-08-05 | 1.26–5.19 | <MRL | <MRL | 5.5 | 7.1 |
| PFHxS | 14 | 14% | 3.1 2025-09-04 | 0.44–3.01 | <MRL | <MRL | 3 | 3.1 |
| PFNA | 14 | 14% | 24 2025-09-04 | 3.41–6.84 | <MRL | <MRL | 23.8 | 24 |
Never detected (21): 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, PFPeS, PFTA, PFTrDA, PFUnA.
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 2023-01-10 to 2026-04-09; 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 52bd2907cbc3 · 2026-10-18T04:10Z · UCMR 5 release Jul2026 · SDWIS 2026Q3. Data and methods.