- PWSID
- PA1460048
- State
- Pennsylvania
- System type
- community water system (CWS)
- Population served
- 72,496
- City
- North Wales
- Counties
- Bucks County, Montgomery County
- Primary source water
- surface water
- UCMR 5 sampling
- 2024-08-14 to 2025-05-14 · 7 entry point(s) · water types: GW;SW
- Service-area boundary
- authoritative
PFOA ≥ 3 × its limit highest single result
PFOA ≥ 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.
Water purchased from
- North Penn Water Authority (PA1460034)
Seller's highest results: PFOA 5.1 ppt · PFOS <MRL · HI 0.002 · detected: PFBS;PFOA;PFPeA - Dtma Main System (PA1090128)
Seller's highest results: PFOA 14.2 ppt · PFOS 13.4 ppt · HI 0.742 · detected: PFBA;PFBS;PFHpA;PFHxA;PFNA;PFOA;PFOS;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) | 13 | 12.2 | 4 |
| PFOS (ppt) | 11.1 | 10.95 | 4 |
| Hazard Index | 0.563 | 0.367 | 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) | 13 | 12.2 | 14 |
| PFOS (ppt) | 11.1 | 10.95 | 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 2024-08-14 to 2025-05-14 · 7 entry point(s) · water types: GW;SW · 16 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2024-08-14 | Forest Park Treatment (SW) | SE1 | <4 | <4 | 0 | none |
| 2024-08-14 | Well #1 Treatment (GW) | SE1 | 11.3 | 7.8 | 0.003 | PFHpA 3.3, PFHxA 4.5, PFPeA 4 |
| 2024-08-14 | Well #21 Treatment (GW) | SE1 | 10 | 9.5 | 0.563 | PFBA 6.8, PFHpA 5.8, PFHxA 8.1, PFPeA 9.3 |
| 2024-08-14 | Well #25 Treatment (GW) | SE1 | 7.9 | 10.4 | 0.362 | PFBA 5.7, PFHpA 3.3, PFHxA 5.8, PFPeA 7.4 |
| 2024-08-14 | Well #34 Treatment (GW) | SE1 | 13 | 11.1 | 0.003 | PFHpA 3.3, PFHxA 5.2, PFPeA 4.3 |
| 2024-08-14 | Well #4 Treatment (GW) | SE1 | 5.4 | 5.2 | 0.003 | PFPeA 3 |
| 2024-08-14 | Wells #8 - #11 & #14 Trt. (GW) | SE1 | 9.1 | 6.2 | 0.002 | PFHxA 6, PFPeA 9, lithium 9.06 µg/L |
| 2024-11-13 | Forest Park Treatment (SW) | SE2 | <4 | <4 | 0 | none |
| 2025-02-11 | Forest Park Treatment (SW) | SE3 | <4 | <4 | 0 | none |
| 2025-02-11 | Well #1 Treatment (GW) | SE2 | 8.3 | 5.9 | 0.002 | PFHxA 3.5 |
| 2025-02-11 | Well #25 Treatment (GW) | SE2 | 8.2 | 9.5 | 0.372 | PFBA 5.7, PFHpA 3.5, PFHxA 6.2, PFPeA 7 |
| 2025-02-11 | Well #34 Treatment (GW) | SE2 | 11.4 | 10.8 | 0.003 | PFHpA 3.4, PFHxA 4.9, PFPeA 3.8 |
| 2025-02-11 | Well #4 Treatment (GW) | SE2 | 5.6 | <4 | 0.003 | none |
| 2025-02-11 | Wells #8 - #11 & #14 Trt. (GW) | SE2 | 7.7 | 5.7 | 0.002 | PFHxA 4.8, PFPeA 5.7, lithium 9.65 µg/L |
| 2025-03-19 | Well #21 Treatment (GW) | SE2 | 7.5 | 5 | 0.002 | PFHpA 3.5, PFHxA 5.5, PFPeA 5.3 |
| 2025-05-14 | Forest Park Treatment (SW) | SE4 | <4 | <4 | 0 | none |
“<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
480 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.
Forest Park Treatment facility 00124 · sample point 124 · surface water
| Compound | MRL | 2024-08-14 SE1 | 2024-11-13 SE2 | 2025-02-11 SE3 | 2025-05-14 SE4 |
|---|---|---|---|---|---|
| 11Cl-PF3OUdS | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| 4:2 FTS | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| 6:2 FTS | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| 8:2 FTS | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| 9Cl-PF3ONS | 2 ppt | < 2 | < 2 | < 2 | < 2 |
| ADONA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| HFPO-DA | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| NEtFOSAA | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| NFDHA | 20 ppt | < 20 | < 20 | < 20 | < 20 |
| NMeFOSAA | 6 ppt | < 6 | < 6 | < 6 | < 6 |
| PFBA | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| PFBS | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFDA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFDoA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFEESA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFHpA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFHpS | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFHxA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFHxS | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFMBA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFMPA | 4 ppt | < 4 | < 4 | < 4 | < 4 |
| PFNA | 4 ppt | < 4 | < 4 | < 4 | < 4 |
| PFOA | 4 ppt | < 4 | < 4 | < 4 | < 4 |
| PFOS | 4 ppt | < 4 | < 4 | < 4 | < 4 |
| PFPeA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFPeS | 4 ppt | < 4 | < 4 | < 4 | < 4 |
| PFTA | 8 ppt | < 8 | < 8 | < 8 | < 8 |
| PFTrDA | 7 ppt | < 7 | < 7 | < 7 | < 7 |
| PFUnA | 2 ppt | < 2 | < 2 | < 2 | < 2 |
| lithium | 9 µg/L | < 9 | < 9 | < 9 | < 9 |
Well #1 Treatment facility 00120 · sample point 120 · groundwater
| Compound | MRL | 2024-08-14 SE1 | 2025-02-11 SE2 |
|---|---|---|---|
| PFBS | 3 ppt | 5.2 | 4.1 |
| PFHpA | 3 ppt | 3.3 | < 3 |
| PFHxA | 3 ppt | 4.5 | 3.5 |
| PFOA | 4 ppt | 11.3 | 8.3 |
| PFOS | 4 ppt | 7.8 | 5.9 |
| PFPeA | 3 ppt | 4 | < 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 |
| 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 #21 Treatment facility 00111 · sample point 111 · groundwater
| Compound | MRL | 2024-08-14 SE1 | 2025-03-19 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | 6.8 | < 5 |
| PFBS | 3 ppt | 6.1 | 4.8 |
| PFHpA | 3 ppt | 5.8 | 3.5 |
| PFHxA | 3 ppt | 8.1 | 5.5 |
| PFNA | 4 ppt | 5.6 | < 4 |
| PFOA | 4 ppt | 10 | 7.5 |
| PFOS | 4 ppt | 9.5 | 5 |
| PFPeA | 3 ppt | 9.3 | 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 |
| 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 |
| 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 #25 Treatment facility 00114 · sample point 114 · groundwater
| Compound | MRL | 2024-08-14 SE1 | 2025-02-11 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | 5.7 | 5.7 |
| PFBS | 3 ppt | 3.3 | 3.5 |
| PFHpA | 3 ppt | 3.3 | 3.5 |
| PFHxA | 3 ppt | 5.8 | 6.2 |
| PFHxS | 3 ppt | 3.6 | 3.7 |
| PFOA | 4 ppt | 7.9 | 8.2 |
| PFOS | 4 ppt | 10.4 | 9.5 |
| PFPeA | 3 ppt | 7.4 | 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 |
| 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 #34 Treatment facility 00117 · sample point 117 · groundwater
| Compound | MRL | 2024-08-14 SE1 | 2025-02-11 SE2 |
|---|---|---|---|
| PFBS | 3 ppt | 6.4 | 6.3 |
| PFHpA | 3 ppt | 3.3 | 3.4 |
| PFHxA | 3 ppt | 5.2 | 4.9 |
| PFOA | 4 ppt | 13 | 11.4 |
| PFOS | 4 ppt | 11.1 | 10.8 |
| PFPeA | 3 ppt | 4.3 | 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 |
| 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 #4 Treatment facility 00102 · sample point 102 · groundwater
| Compound | MRL | 2024-08-14 SE1 | 2025-02-11 SE2 |
|---|---|---|---|
| PFBS | 3 ppt | 6 | 5.5 |
| PFOA | 4 ppt | 5.4 | 5.6 |
| PFOS | 4 ppt | 5.2 | < 4 |
| PFPeA | 3 ppt | 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 |
| 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 |
| 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 |
Wells #8 - #11 & #14 Trt. facility 00105 · sample point 105 · groundwater
| Compound | MRL | 2024-08-14 SE1 | 2025-02-11 SE2 |
|---|---|---|---|
| PFBS | 3 ppt | 3.3 | 3.8 |
| PFHxA | 3 ppt | 6 | 4.8 |
| PFOA | 4 ppt | 9.1 | 7.7 |
| PFOS | 4 ppt | 6.2 | 5.7 |
| PFPeA | 3 ppt | 9 | 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 |
| 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 | 9.06 | 9.65 |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| PFBS | 16 | 75% | 6.4 2024-08-14 | 3.64–4.39 | 3.8 | 5.5 | 6.3 | 6.4 |
| PFOA | 16 | 75% | 13 2024-08-14 | 6.59–7.59 | 7.7 | 9.1 | 11.4 | 13 |
| PFOS | 16 | 69% | 11.1 2024-08-14 | 5.44–6.69 | 5.7 | 9.5 | 10.8 | 11.1 |
| PFHxA | 16 | 62% | 8.1 2024-08-14 | 3.41–4.53 | 4.5 | 5.5 | 6.2 | 8.1 |
| PFPeA | 16 | 62% | 9.3 2024-08-14 | 3.67–4.8 | 3.8 | 5.7 | 9 | 9.3 |
| PFHpA | 16 | 44% | 5.8 2024-08-14 | 1.63–3.32 | <MRL | 3.3 | 3.5 | 5.8 |
| PFBA | 16 | 19% | 6.8 2024-08-14 | 1.14–5.2 | <MRL | <MRL | 5.7 | 6.8 |
| PFHxS | 16 | 12% | 3.7 2025-02-11 | 0.46–3.08 | <MRL | <MRL | 3.6 | 3.7 |
| lithium | 16 | 12% | 9.65 2025-02-11 | 1.17–9.04 | <MRL | <MRL | 9.06 | 9.65 |
| PFNA | 16 | 6% | 5.6 2024-08-14 | 0.35–4.1 | <MRL | <MRL | <MRL | 5.6 |
Never detected (20): 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, 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.