- PWSID
- PA1460055
- State
- Pennsylvania
- System type
- community water system (CWS)
- Population served
- 8,200
- City
- Norristown
- Counties
- Montgomery County
- Primary source water
- surface water (purchased)
- UCMR 5 sampling
- 2024-03-11 to 2024-10-16 · 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.
Water purchased from
- Pa American Norristown (PA1460046)
Seller's highest results: PFOA <MRL · PFOS <MRL · HI 0.003 · detected: PFBA;PFBS;PFHxA;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) | 30.8 | 28.95 | 4 |
| PFOS (ppt) | 57.9 | 54.1 | 4 |
| Hazard Index | 1.072 | 0.722 | 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) | 30.8 | 28.95 | 14 |
| PFOS (ppt) | 57.9 | 54.1 | 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 2024-03-11 to 2024-10-16 · 8 entry point(s) · water types: GW · 16 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2024-03-11 | EP 102 AWC 6 AND 9 (GW) | SE1 | 8.3 | 7.9 | 0.003 | PFHpA 3.2, PFHxA 5, PFPeA 5.4, lithium 13.3 µg/L |
| 2024-03-11 | EP 107 VFCC 1 (GW) | SE1 | 14.2 | 9.2 | 0.372 | PFBA 6.4, PFHpA 7.8, PFHxA 11.7, PFPeA 13, lithium 12.9 µg/L |
| 2024-03-11 | EP 109 VFCC 3 (GW) | SE1 | 30.8 | 57.9 | 0 | PFHpA 5.8, PFHxA 8, PFPeA 8.7, lithium 24.2 µg/L |
| 2024-03-12 | EP 108 VFCC 2 (GW) | SE1 | 16.7 | 50.5 | 0.34 | PFBA 5.9, PFHpA 7, PFHxA 10.9, PFPeA 12.1, lithium 24.5 µg/L |
| 2024-03-12 | EP 114 AWC AUD PARK (GW) | SE1 | 8.5 | 9.4 | 0.482 | PFHxA 4.6, PFPeA 4.8, lithium 14.8 µg/L |
| 2024-03-12 | EP 116 AWC 14 (GW) | SE1 | 8.8 | 6.9 | 0.002 | PFHxA 5.5, PFPeA 5.7, lithium 17.8 µg/L |
| 2024-03-13 | EP 111 AWC 1 AND 2 (GW) | SE1 | 4.7 | 4.8 | 0.002 | none |
| 2024-03-13 | EP 115 AWC 15 (GW) | SE1 | <4 | <4 | 0 | none |
| 2024-09-30 | EP 107 VFCC 1 (GW) | SE2 | 16.1 | 7.5 | 1.072 | PFBA 6.6, PFHpA 7.9, PFHxA 10.9, PFPeA 13.3, lithium 11.8 µg/L |
| 2024-09-30 | EP 108 VFCC 2 (GW) | SE2 | 19 | 57.7 | 0.9 | PFBA 5.9, PFHpA 5.6, PFHxA 8, PFPeA 9.2, lithium 20.8 µg/L |
| 2024-09-30 | EP 109 VFCC 3 (GW) | SE2 | 27.1 | 37.6 | 0.66 | PFBA 5.7, PFHpA 6.2, PFHxA 8, PFPeA 9.5, lithium 21.6 µg/L |
| 2024-10-02 | EP 102 AWC 6 AND 9 (GW) | SE2 | 9.2 | 6.1 | 0.002 | PFBA 5, PFHxA 4.9, PFPeA 5.3, lithium 13.6 µg/L |
| 2024-10-02 | EP 111 AWC 1 AND 2 (GW) | SE2 | 5.1 | <4 | 0 | none |
| 2024-10-02 | EP 114 AWC AUD PARK (GW) | SE2 | 9.6 | 8.3 | 0.502 | PFHpA 3.2, PFHxA 4.7, PFPeA 5.1, lithium 14.8 µg/L |
| 2024-10-02 | EP 116 AWC 14 (GW) | SE2 | 10.1 | 6.4 | 0.002 | PFHpA 3.1, PFHxA 5.2, PFPeA 5.3, lithium 16 µg/L |
| 2024-10-16 | EP 115 AWC 15 (GW) | SE2 | <4 | <4 | 0 | lithium 9.04 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
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.
EP 102 AWC 6 AND 9 facility 102 · sample point EP102 · groundwater
| Compound | MRL | 2024-03-11 SE1 | 2024-10-02 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | < 5 | 5 |
| PFBS | 3 ppt | 5 | 4.5 |
| PFHpA | 3 ppt | 3.2 | < 3 |
| PFHxA | 3 ppt | 5 | 4.9 |
| PFOA | 4 ppt | 8.3 | 9.2 |
| PFOS | 4 ppt | 7.9 | 6.1 |
| PFPeA | 3 ppt | 5.4 | 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 |
| 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 | 13.3 | 13.6 |
EP 107 VFCC 1 facility 107 · sample point EP107 · groundwater
| Compound | MRL | 2024-03-11 SE1 | 2024-09-30 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | 6.4 | 6.6 |
| PFBS | 3 ppt | 4.3 | 4 |
| PFHpA | 3 ppt | 7.8 | 7.9 |
| PFHxA | 3 ppt | 11.7 | 10.9 |
| PFHxS | 3 ppt | 3.7 | 4.4 |
| PFNA | 4 ppt | < 4 | 6.3 |
| PFOA | 4 ppt | 14.2 | 16.1 |
| PFOS | 4 ppt | 9.2 | 7.5 |
| PFPeA | 3 ppt | 13 | 13.3 |
| 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 |
| 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 | 12.9 | 11.8 |
EP 108 VFCC 2 facility 108 · sample point EP108 · groundwater
| Compound | MRL | 2024-03-12 SE1 | 2024-09-30 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | 5.9 | 5.9 |
| PFHpA | 3 ppt | 7 | 5.6 |
| PFHxA | 3 ppt | 10.9 | 8 |
| PFHxS | 3 ppt | 3.4 | 3.6 |
| PFNA | 4 ppt | < 4 | 5.4 |
| PFOA | 4 ppt | 16.7 | 19 |
| PFOS | 4 ppt | 50.5 | 57.7 |
| PFPeA | 3 ppt | 12.1 | 9.2 |
| 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 |
| PFPeS | 4 ppt | < 4 | < 4 |
| PFTA | 8 ppt | < 8 | < 8 |
| PFTrDA | 7 ppt | < 7 | < 7 |
| PFUnA | 2 ppt | < 2 | < 2 |
| lithium | 9 µg/L | 24.5 | 20.8 |
EP 109 VFCC 3 facility 109 · sample point EP109 · groundwater
| Compound | MRL | 2024-03-11 SE1 | 2024-09-30 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | < 5 | 5.7 |
| PFHpA | 3 ppt | 5.8 | 6.2 |
| PFHxA | 3 ppt | 8 | 8 |
| PFNA | 4 ppt | < 4 | 6.6 |
| PFOA | 4 ppt | 30.8 | 27.1 |
| PFOS | 4 ppt | 57.9 | 37.6 |
| PFPeA | 3 ppt | 8.7 | 9.5 |
| 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 |
| 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 | 24.2 | 21.6 |
EP 111 AWC 1 AND 2 facility 111 · sample point EP111 · groundwater
| Compound | MRL | 2024-03-13 SE1 | 2024-10-02 SE2 |
|---|---|---|---|
| PFBS | 3 ppt | 3.6 | < 3 |
| PFOA | 4 ppt | 4.7 | 5.1 |
| PFOS | 4 ppt | 4.8 | < 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 |
| 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 |
| 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 |
EP 114 AWC AUD PARK facility 114 · sample point EP114 · groundwater
| Compound | MRL | 2024-03-12 SE1 | 2024-10-02 SE2 |
|---|---|---|---|
| PFBS | 3 ppt | 3.7 | 3.9 |
| PFHpA | 3 ppt | < 3 | 3.2 |
| PFHxA | 3 ppt | 4.6 | 4.7 |
| PFHxS | 3 ppt | 4.8 | 5 |
| PFOA | 4 ppt | 8.5 | 9.6 |
| PFOS | 4 ppt | 9.4 | 8.3 |
| PFPeA | 3 ppt | 4.8 | 5.1 |
| 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 |
| 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 | 14.8 | 14.8 |
EP 115 AWC 15 facility 115 · sample point EP115 · groundwater
| Compound | MRL | 2024-03-13 SE1 | 2024-10-16 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 | 9.04 |
EP 116 AWC 14 facility 116 · sample point EP116 · groundwater
| Compound | MRL | 2024-03-12 SE1 | 2024-10-02 SE2 |
|---|---|---|---|
| PFBS | 3 ppt | 4 | 3.8 |
| PFHpA | 3 ppt | < 3 | 3.1 |
| PFHxA | 3 ppt | 5.5 | 5.2 |
| PFOA | 4 ppt | 8.8 | 10.1 |
| PFOS | 4 ppt | 6.9 | 6.4 |
| PFPeA | 3 ppt | 5.7 | 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 |
| 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 | 16 |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| PFOA | 16 | 88% | 30.8 2024-03-11 | 11.76–12.26 | 9.2 | 16.1 | 27.1 | 30.8 |
| PFOS | 16 | 81% | 57.9 2024-03-11 | 16.89–17.64 | 7.5 | 9.4 | 57.7 | 57.9 |
| lithium | 16 | 81% | 24.5 2024-03-12 | 13.45–15.13 | 13.6 | 17.8 | 24.2 | 24.5 |
| PFHxA | 16 | 75% | 11.7 2024-03-11 | 5.46–6.21 | 5 | 8 | 10.9 | 11.7 |
| PFPeA | 16 | 75% | 13.3 2024-09-30 | 6.09–6.84 | 5.3 | 9.2 | 13 | 13.3 |
| PFBS | 16 | 56% | 5 2024-03-11 | 2.3–3.61 | 3.6 | 4 | 4.5 | 5 |
| PFHpA | 16 | 56% | 7.9 2024-09-30 | 3.11–4.42 | 3.1 | 5.8 | 7.8 | 7.9 |
| PFBA | 16 | 38% | 6.6 2024-09-30 | 2.22–5.34 | <MRL | 5.7 | 6.4 | 6.6 |
| PFHxS | 16 | 38% | 5 2024-10-02 | 1.56–3.43 | <MRL | 3.6 | 4.8 | 5 |
| PFNA | 16 | 19% | 6.6 2024-09-30 | 1.14–4.39 | <MRL | <MRL | 6.3 | 6.6 |
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.