- PWSID
- PA1460050
- State
- Pennsylvania
- System type
- community water system (CWS)
- Population served
- 7,700
- City
- Telford
- Counties
- Bucks County, Montgomery County
- Primary source water
- surface water (purchased)
- UCMR 5 sampling
- 2025-03-18 to 2025-12-08 · 7 entry point(s) · water types: GW;SW
- Service-area boundary
- authoritative
PFOS ≥ 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 - Hilltown Twp Water&Sewer Auth (PA1090117)
Seller's highest results: PFOA 8 ppt · PFOS 6.8 ppt · HI 0.003 · detected: PFBS;PFHxA;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) | 14.9 | 14.45 | 4 |
| PFOS (ppt) | 15.2 | 14 | 4 |
| Hazard Index | 0.553 | 0.538 | 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) | 14.9 | 14.45 | 14 |
| PFOS (ppt) | 15.2 | 14 | 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 2025-03-18 to 2025-12-08 · 7 entry point(s) · water types: GW;SW · 18 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2025-03-18 | EP 101 (WELL 1) (GW) | SE1 | 14.9 | 15.2 | 0.553 | 6:2 FTS 202.2, PFBA 19.4, PFHpA 14.7, PFHxA 60.7, PFPeA 79, lithium 28.7 µg/L |
| 2025-03-18 | EP 102 (WELL 3) (GW) | SE1 | 11.3 | 11.1 | 0.002 | 6:2 FTS 17.6, PFBA 9.7, PFHpA 7.9, PFHxA 22.9, PFPeA 32.3, lithium 25.7 µg/L |
| 2025-03-18 | EP 104 (WELL 5) (GW) | SE1 | <4 | 4.9 | 0.002 | lithium 19.8 µg/L |
| 2025-03-18 | EP 105 (WELL 6) (GW) | SE1 | 10.6 | 8.7 | 0.003 | 6:2 FTS 15.1, PFBA 53.6, PFHpA 43.5, PFHxA 94.6, PFPeA 195.7, lithium 15.6 µg/L |
| 2025-03-18 | NPWA CLYMER INTC EP (SW) | SE1 | 4.3 | 4.8 | 0.002 | PFPeA 3.4, lithium 18.8 µg/L |
| 2025-03-18 | NPWA NACEVL INTC EP (SW) | SE1 | <4 | <4 | 0 | none |
| 2025-03-18 | WELL 7 (GW) | SE1 | 6.2 | 4.6 | 0.002 | PFBA 5, PFHpA 4.3, PFHxA 7.9, PFPeA 10.6, lithium 22 µg/L |
| 2025-06-16 | NPWA CLYMER INTC EP (SW) | SE2 | 4.2 | 4.9 | 0.002 | PFHxA 3.2, PFPeA 4.1, lithium 19.4 µg/L |
| 2025-06-16 | NPWA NACEVL INTC EP (SW) | SE2 | <4 | <4 | 0 | none |
| 2025-09-23 | EP 101 (WELL 1) (GW) | SE2 | 14 | 12.8 | 0.523 | 6:2 FTS 226.2, PFBA 22.2, PFHpA 17.5, PFHxA 66.7, PFPeA 94.1, lithium 30.7 µg/L |
| 2025-09-23 | EP 102 (WELL 3) (GW) | SE2 | 11.3 | 11.5 | 0.003 | 6:2 FTS 6, PFBA 7.1, PFHpA 5.7, PFHxA 12.7, PFPeA 16.9, lithium 22.1 µg/L |
| 2025-09-23 | EP 104 (WELL 5) (GW) | SE2 | <4 | 4.1 | 0.002 | lithium 14.8 µg/L |
| 2025-09-23 | EP 105 (WELL 6) (GW) | SE2 | 13.3 | 11.5 | 0.004 | 6:2 FTS 134, PFBA 40.3, PFHpA 35.3, PFHxA 92.8, PFPeA 160.2, lithium 20.9 µg/L |
| 2025-09-23 | NPWA CLYMER INTC EP (SW) | SE3 | 4.4 | 5 | 0.002 | PFPeA 3.3, lithium 19 µg/L |
| 2025-09-23 | NPWA NACEVL INTC EP (SW) | SE3 | <4 | <4 | 0 | none |
| 2025-09-23 | WELL 7 (GW) | SE2 | 6.4 | 4.9 | 0.002 | PFBA 5.3, PFHpA 4.4, PFHxA 8.5, PFPeA 10.8, lithium 23.4 µg/L |
| 2025-12-08 | NPWA CLYMER INTC EP (SW) | SE4 | 4.7 | 4.4 | 0.002 | PFHxA 4.9, PFPeA 6.2, lithium 18.7 µg/L |
| 2025-12-08 | NPWA NACEVL INTC EP (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.
EP 101 (WELL 1) facility 101 · sample point EP101 · groundwater
| Compound | MRL | 2025-03-18 SE1 | 2025-09-23 SE2 |
|---|---|---|---|
| 6:2 FTS | 5 ppt | 202.2 | 226.2 |
| PFBA | 5 ppt | 19.4 | 22.2 |
| PFBS | 3 ppt | 7 | 7 |
| PFHpA | 3 ppt | 14.7 | 17.5 |
| PFHxA | 3 ppt | 60.7 | 66.7 |
| PFHxS | 3 ppt | 5.5 | 5.2 |
| PFOA | 4 ppt | 14.9 | 14 |
| PFOS | 4 ppt | 15.2 | 12.8 |
| PFPeA | 3 ppt | 79 | 94.1 |
| 11Cl-PF3OUdS | 5 ppt | < 5 | < 5 |
| 4:2 FTS | 3 ppt | < 3 | < 3 |
| 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 | 28.7 | 30.7 |
EP 102 (WELL 3) facility 102 · sample point EP102 · groundwater
| Compound | MRL | 2025-03-18 SE1 | 2025-09-23 SE2 |
|---|---|---|---|
| 6:2 FTS | 5 ppt | 17.6 | 6 |
| PFBA | 5 ppt | 9.7 | 7.1 |
| PFBS | 3 ppt | 4.7 | 5.1 |
| PFHpA | 3 ppt | 7.9 | 5.7 |
| PFHxA | 3 ppt | 22.9 | 12.7 |
| PFOA | 4 ppt | 11.3 | 11.3 |
| PFOS | 4 ppt | 11.1 | 11.5 |
| PFPeA | 3 ppt | 32.3 | 16.9 |
| 11Cl-PF3OUdS | 5 ppt | < 5 | < 5 |
| 4:2 FTS | 3 ppt | < 3 | < 3 |
| 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 | 25.7 | 22.1 |
EP 104 (WELL 5) facility 104 · sample point EP104 · groundwater
| Compound | MRL | 2025-03-18 SE1 | 2025-09-23 SE2 |
|---|---|---|---|
| PFBS | 3 ppt | 4.3 | 3 |
| PFOS | 4 ppt | 4.9 | 4.1 |
| 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 |
| 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 | 19.8 | 14.8 |
EP 105 (WELL 6) facility 105 · sample point EP105 · groundwater
| Compound | MRL | 2025-03-18 SE1 | 2025-09-23 SE2 |
|---|---|---|---|
| 6:2 FTS | 5 ppt | 15.1 | 134 |
| PFBA | 5 ppt | 53.6 | 40.3 |
| PFBS | 3 ppt | 6.9 | 7.4 |
| PFHpA | 3 ppt | 43.5 | 35.3 |
| PFHxA | 3 ppt | 94.6 | 92.8 |
| PFOA | 4 ppt | 10.6 | 13.3 |
| PFOS | 4 ppt | 8.7 | 11.5 |
| PFPeA | 3 ppt | 195.7 | 160.2 |
| 11Cl-PF3OUdS | 5 ppt | < 5 | < 5 |
| 4:2 FTS | 3 ppt | < 3 | < 3 |
| 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 | 15.6 | 20.9 |
NPWA CLYMER INTC EP facility 109 · sample point EP109 · surface water
| Compound | MRL | 2025-03-18 SE1 | 2025-06-16 SE2 | 2025-09-23 SE3 | 2025-12-08 SE4 |
|---|---|---|---|---|---|
| PFBS | 3 ppt | 4 | 4.1 | 4.3 | 3.9 |
| PFHxA | 3 ppt | < 3 | 3.2 | < 3 | 4.9 |
| PFOA | 4 ppt | 4.3 | 4.2 | 4.4 | 4.7 |
| PFOS | 4 ppt | 4.8 | 4.9 | 5 | 4.4 |
| PFPeA | 3 ppt | 3.4 | 4.1 | 3.3 | 6.2 |
| 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 |
| 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 |
| 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 |
| 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 | 18.8 | 19.4 | 19 | 18.7 |
NPWA NACEVL INTC EP facility 110 · sample point EP110 · surface water
| Compound | MRL | 2025-03-18 SE1 | 2025-06-16 SE2 | 2025-09-23 SE3 | 2025-12-08 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 7 facility 106 · sample point EP106 · groundwater
| Compound | MRL | 2025-03-18 SE1 | 2025-09-23 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | 5 | 5.3 |
| PFBS | 3 ppt | 3.5 | 3.6 |
| PFHpA | 3 ppt | 4.3 | 4.4 |
| PFHxA | 3 ppt | 7.9 | 8.5 |
| PFOA | 4 ppt | 6.2 | 6.4 |
| PFOS | 4 ppt | 4.6 | 4.9 |
| PFPeA | 3 ppt | 10.6 | 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 |
| 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 | 22 | 23.4 |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| PFBS | 18 | 78% | 7.4 2025-09-23 | 3.82–4.49 | 4 | 5.1 | 7 | 7.4 |
| PFOS | 18 | 78% | 15.2 2025-03-18 | 6.02–6.91 | 4.9 | 11.1 | 12.8 | 15.2 |
| lithium | 18 | 78% | 30.7 2025-09-23 | 16.64–18.64 | 19 | 22.1 | 28.7 | 30.7 |
| PFOA | 18 | 67% | 14.9 2025-03-18 | 5.87–7.2 | 4.4 | 11.3 | 14 | 14.9 |
| PFPeA | 18 | 67% | 195.7 2025-03-18 | 34.26–35.26 | 4.1 | 32.3 | 160.2 | 195.7 |
| PFHxA | 18 | 56% | 94.6 2025-03-18 | 20.83–22.16 | 3.2 | 22.9 | 92.8 | 94.6 |
| PFBA | 18 | 44% | 53.6 2025-03-18 | 9.03–11.81 | <MRL | 9.7 | 40.3 | 53.6 |
| PFHpA | 18 | 44% | 43.5 2025-03-18 | 7.41–9.07 | <MRL | 7.9 | 35.3 | 43.5 |
| 6:2 FTS | 18 | 33% | 226.2 2025-09-23 | 33.39–36.73 | <MRL | 15.1 | 202.2 | 226.2 |
| PFHxS | 18 | 11% | 5.5 2025-03-18 | 0.59–3.26 | <MRL | <MRL | 5.2 | 5.5 |
Never detected (20): 11Cl-PF3OUdS, 4:2 FTS, 8:2 FTS, 9Cl-PF3ONS, ADONA, HFPO-DA, NEtFOSAA, NFDHA, NMeFOSAA, PFDA, PFDoA, PFEESA, PFHpS, PFMBA, PFMPA, PFNA, 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.