- PWSID
- PA1090128
- State
- Pennsylvania
- System type
- community water system (CWS)
- Population served
- 8,655
- City
- Doylestown
- Counties
- Bucks County
- Primary source water
- surface water (purchased)
- UCMR 5 sampling
- 2025-01-23 to 2025-10-21 · 8 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
- Doylestown Boro Water Dept (PA1090081)
Seller's highest results: PFOA 14.6 ppt · PFOS 11.3 ppt · HI 0.984 · detected: PFBA;PFBS;PFHpA;PFHxA;PFHxS;PFNA;PFOA;PFOS;PFPeA;PFUnA - North Penn Water Authority (PA1460034)
Seller's highest results: PFOA 5.1 ppt · PFOS <MRL · HI 0.002 · detected: PFBS;PFOA;PFPeA - Buckingham Twp Furlong (PA1090159)
Seller not monitored under UCMR 5. - North Wales Water Authority (PA1460048)
Seller's highest results: PFOA 13 ppt · PFOS 11.1 ppt · HI 0.563 · detected: PFBA;PFBS;PFHpA;PFHxA;PFHxS;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) | 14.2 | 13.5 | 4 |
| PFOS (ppt) | 13.4 | 11.8 | 4 |
| Hazard Index | 0.742 | 0.702 | 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) | 14.2 | 13.5 | 14 |
| PFOS (ppt) | 13.4 | 11.8 | 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 2025-01-23 to 2025-10-21 · 8 entry point(s) · water types: GW;SW · 18 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2025-01-23 | CENTRAL WELL 3 (GW) | SE1 | 11.6 | 9.4 | 0.502 | PFHpA 3.3, PFHxA 3.9, PFPeA 3.8 |
| 2025-01-23 | CENTRAL WELL 7 (GW) | SE1 | 14.2 | 8.7 | 0.742 | PFBA 6.3, PFHpA 7.2, PFHxA 8.4, PFPeA 10.4 |
| 2025-01-23 | NORTH WELLS 3&4 EP (GW) | SE1 | 10.9 | 7.8 | 0.004 | PFHpA 3.5, PFHxA 5.2, PFPeA 5.7 |
| 2025-01-23 | NORTHWEST WELL 1 (GW) | SE1 | 10.1 | 10.2 | 0.003 | PFHxA 3.6, PFPeA 3.4, lithium 9.91 µg/L |
| 2025-01-23 | NPWA INTERCONNECTION (SW) | SE1 | <4 | <4 | 0 | none |
| 2025-01-23 | SOUTH WELL 1 (GW) | SE1 | 9.2 | 7.1 | 0.002 | PFHpA 3, PFHxA 4.3, PFPeA 4.6 |
| 2025-01-23 | SOUTH WELL 6 (GW) | SE1 | 10.9 | 10.5 | 0.003 | PFHpA 3.6, PFHxA 4.8, PFPeA 5.1, lithium 9.01 µg/L |
| 2025-01-23 | SOUTH WELL 7 (GW) | SE1 | 11.8 | 9.1 | 0.004 | PFHpA 3.7, PFHxA 4.8, PFPeA 5.3, lithium 13.2 µg/L |
| 2025-04-22 | NPWA INTERCONNECTION (SW) | SE2 | <4 | <4 | 0 | none |
| 2025-07-15 | CENTRAL WELL 3 (GW) | SE2 | 12.1 | 10.1 | 0.462 | PFHpA 3.5, PFHxA 4.6, PFPeA 4.2 |
| 2025-07-15 | CENTRAL WELL 7 (GW) | SE2 | 12.8 | 7.9 | 0.662 | PFBA 6, PFHpA 6, PFHxA 8.1, PFPeA 9.8 |
| 2025-07-15 | NORTH WELLS 3&4 EP (GW) | SE2 | 9.4 | 7.4 | 0.004 | PFHxA 5, PFPeA 5.2 |
| 2025-07-15 | NORTHWEST WELL 1 (GW) | SE2 | 11.1 | 13.4 | 0.005 | PFHpA 3, PFHxA 4.1, PFPeA 3.6, lithium 11.7 µg/L |
| 2025-07-15 | NPWA INTERCONNECTION (SW) | SE3 | <4 | <4 | 0 | none |
| 2025-07-15 | SOUTH WELL 1 (GW) | SE2 | 9.3 | 7.2 | 0.002 | PFHxA 4.7, PFPeA 4.9 |
| 2025-07-15 | SOUTH WELL 6 (GW) | SE2 | 10.1 | 9.3 | 0.004 | PFHpA 3.1, PFHxA 4.9, PFPeA 4.8, lithium 11.1 µg/L |
| 2025-07-15 | SOUTH WELL 7 (GW) | SE2 | 12.4 | 9.5 | 0.005 | PFBA 5, PFHpA 4, PFHxA 5.4, PFPeA 5.6, lithium 15.1 µg/L |
| 2025-10-21 | NPWA INTERCONNECTION (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
540 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.
CENTRAL WELL 3 facility 108 · sample point EP108 · groundwater
| Compound | MRL | 2025-01-23 SE1 | 2025-07-15 SE2 |
|---|---|---|---|
| PFBS | 3 ppt | 3.7 | 4.3 |
| PFHpA | 3 ppt | 3.3 | 3.5 |
| PFHxA | 3 ppt | 3.9 | 4.6 |
| PFNA | 4 ppt | 5 | 4.6 |
| PFOA | 4 ppt | 11.6 | 12.1 |
| PFOS | 4 ppt | 9.4 | 10.1 |
| PFPeA | 3 ppt | 3.8 | 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 |
| 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 |
| 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 |
CENTRAL WELL 7 facility 110 · sample point EP110 · groundwater
| Compound | MRL | 2025-01-23 SE1 | 2025-07-15 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | 6.3 | 6 |
| PFBS | 3 ppt | 3.4 | 3.3 |
| PFHpA | 3 ppt | 7.2 | 6 |
| PFHxA | 3 ppt | 8.4 | 8.1 |
| PFNA | 4 ppt | 7.4 | 6.6 |
| PFOA | 4 ppt | 14.2 | 12.8 |
| PFOS | 4 ppt | 8.7 | 7.9 |
| PFPeA | 3 ppt | 10.4 | 9.8 |
| 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 |
| 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 |
NORTH WELLS 3&4 EP facility 107 · sample point EP107 · groundwater
| Compound | MRL | 2025-01-23 SE1 | 2025-07-15 SE2 |
|---|---|---|---|
| PFBS | 3 ppt | 7 | 7.1 |
| PFHpA | 3 ppt | 3.5 | < 3 |
| PFHxA | 3 ppt | 5.2 | 5 |
| PFOA | 4 ppt | 10.9 | 9.4 |
| PFOS | 4 ppt | 7.8 | 7.4 |
| PFPeA | 3 ppt | 5.7 | 5.2 |
| 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 |
| 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 |
NORTHWEST WELL 1 facility 111 · sample point EP111 · groundwater
| Compound | MRL | 2025-01-23 SE1 | 2025-07-15 SE2 |
|---|---|---|---|
| PFBS | 3 ppt | 6.1 | 9.8 |
| PFHpA | 3 ppt | < 3 | 3 |
| PFHxA | 3 ppt | 3.6 | 4.1 |
| PFOA | 4 ppt | 10.1 | 11.1 |
| PFOS | 4 ppt | 10.2 | 13.4 |
| PFPeA | 3 ppt | 3.4 | 3.6 |
| 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 |
| 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 | 9.91 | 11.7 |
NPWA INTERCONNECTION facility 112 · sample point EP112 · surface water
| Compound | MRL | 2025-01-23 SE1 | 2025-04-22 SE2 | 2025-07-15 SE3 | 2025-10-21 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 |
SOUTH WELL 1 facility 101 · sample point EP101 · groundwater
| Compound | MRL | 2025-01-23 SE1 | 2025-07-15 SE2 |
|---|---|---|---|
| PFBS | 3 ppt | 3.1 | 3.4 |
| PFHpA | 3 ppt | 3 | < 3 |
| PFHxA | 3 ppt | 4.3 | 4.7 |
| PFOA | 4 ppt | 9.2 | 9.3 |
| PFOS | 4 ppt | 7.1 | 7.2 |
| PFPeA | 3 ppt | 4.6 | 4.9 |
| 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 |
SOUTH WELL 6 facility 103 · sample point EP103 · groundwater
| Compound | MRL | 2025-01-23 SE1 | 2025-07-15 SE2 |
|---|---|---|---|
| PFBS | 3 ppt | 6.7 | 7.3 |
| PFHpA | 3 ppt | 3.6 | 3.1 |
| PFHxA | 3 ppt | 4.8 | 4.9 |
| PFOA | 4 ppt | 10.9 | 10.1 |
| PFOS | 4 ppt | 10.5 | 9.3 |
| PFPeA | 3 ppt | 5.1 | 4.8 |
| 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 | 9.01 | 11.1 |
SOUTH WELL 7 facility 104 · sample point EP104 · groundwater
| Compound | MRL | 2025-01-23 SE1 | 2025-07-15 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | < 5 | 5 |
| PFBS | 3 ppt | 7.7 | 9.8 |
| PFHpA | 3 ppt | 3.7 | 4 |
| PFHxA | 3 ppt | 4.8 | 5.4 |
| PFOA | 4 ppt | 11.8 | 12.4 |
| PFOS | 4 ppt | 9.1 | 9.5 |
| PFPeA | 3 ppt | 5.3 | 5.6 |
| 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 |
| 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 | 13.2 | 15.1 |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| PFBS | 18 | 78% | 9.8 2025-07-15 | 4.59–5.26 | 3.7 | 7.1 | 9.8 | 9.8 |
| PFHxA | 18 | 78% | 8.4 2025-01-23 | 3.99–4.66 | 4.6 | 5 | 8.1 | 8.4 |
| PFOA | 18 | 78% | 14.2 2025-01-23 | 8.66–9.55 | 10.1 | 11.8 | 12.8 | 14.2 |
| PFOS | 18 | 78% | 13.4 2025-07-15 | 7.09–7.98 | 7.9 | 9.5 | 10.5 | 13.4 |
| PFPeA | 18 | 78% | 10.4 2025-01-23 | 4.24–4.91 | 4.6 | 5.3 | 9.8 | 10.4 |
| PFHpA | 18 | 61% | 7.2 2025-01-23 | 2.44–3.61 | 3 | 3.6 | 6 | 7.2 |
| lithium | 18 | 33% | 15.1 2025-07-15 | 3.89–9.89 | <MRL | 9.91 | 13.2 | 15.1 |
| PFNA | 18 | 22% | 7.4 2025-01-23 | 1.31–4.42 | <MRL | <MRL | 6.6 | 7.4 |
| PFBA | 18 | 17% | 6.3 2025-01-23 | 0.96–5.13 | <MRL | <MRL | 6 | 6.3 |
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, PFHpS, PFHxS, 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.