- PWSID
- PA3390032
- State
- Pennsylvania
- System type
- community water system (CWS)
- Population served
- 14,000
- City
- Emmaus
- Counties
- Lehigh County
- Primary source water
- groundwater
- UCMR 5 sampling
- 2024-08-01 to 2025-02-11 · 4 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) | 22.4 | 19.5 | 4 |
| PFOS (ppt) | 153 | 127 | 4 |
| Hazard Index | 13.303 | 11.432 | 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) | 22.4 | 19.5 | 14 |
| PFOS (ppt) | 153 | 127 | 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 2024-08-01 to 2025-02-11 · 4 entry point(s) · water types: GW · 9 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2024-08-01 | Waterworks Building (GW) | SE1 | 22.4 | 153 | 13.303 | 6:2 FTS 64.5, 8:2 FTS 41.9, PFBA 13.5, PFDA 7, PFHpA 30.9, PFHxA 41.5, PFPeA 51.6, PFUnA 22.2 |
| 2024-08-01 | Well #4 Pump House (GW) | SE1 | n/a | n/a | n/a | none |
| 2024-08-01 | Well #6 Pump House (GW) | SE1 | 4.1 | 7.1 | 0.007 | PFHxA 5, PFPeA 6.4 |
| 2024-08-01 | Well #7 Pump House (GW) | SE1 | 14.9 | 4.4 | 0.002 | PFHpA 4.2, PFHxA 4.2, PFPeA 4.4 |
| 2024-08-20 | Well #4 Pump House (GW) | SE1 | 6 | 4.3 | 1.08 | PFHpA 4.9, PFHxA 4.8, PFPeA 7 |
| 2025-02-11 | Waterworks Building (GW) | SE2 | 16.6 | 101 | 9.562 | 6:2 FTS 38.4, 8:2 FTS 24.7, PFBA 9, PFDA 3.1, PFHpA 17.8, PFHxA 26, PFPeA 31.6, PFUnA 14.7 |
| 2025-02-11 | Well #4 Pump House (GW) | SE2 | 7.8 | 5 | 1.17 | PFHpA 5.3, PFHxA 6, PFPeA 7.1 |
| 2025-02-11 | Well #6 Pump House (GW) | SE2 | 5.1 | 8.8 | 0.348 | PFHxA 4.6, PFPeA 6.3, PFUnA 2.2 |
| 2025-02-11 | Well #7 Pump House (GW) | SE2 | 11.4 | <4 | 0 | PFHpA 3.9, PFHxA 3.7, PFPeA 3.5 |
“<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
240 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.
Waterworks Building facility 00112 · sample point 112 · groundwater
| Compound | MRL | 2024-08-01 SE1 | 2025-02-11 SE2 |
|---|---|---|---|
| 6:2 FTS | 5 ppt | 64.5 | 38.4 |
| 8:2 FTS | 5 ppt | 41.9 | 24.7 |
| PFBA | 5 ppt | 13.5 | 9 |
| PFBS | 3 ppt | 4.9 | 3.9 |
| PFDA | 3 ppt | 7 | 3.1 |
| PFHpA | 3 ppt | 30.9 | 17.8 |
| PFHxA | 3 ppt | 41.5 | 26 |
| PFHxS | 3 ppt | 33.2 | 24.6 |
| PFNA | 4 ppt | 99.8 | 71 |
| PFOA | 4 ppt | 22.4 | 16.6 |
| PFOS | 4 ppt | 153 | 101 |
| PFPeA | 3 ppt | 51.6 | 31.6 |
| PFUnA | 2 ppt | 22.2 | 14.7 |
| 11Cl-PF3OUdS | 5 ppt | < 5 | < 5 |
| 4:2 FTS | 3 ppt | < 3 | < 3 |
| 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 |
| 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 |
| lithium | 9 µg/L | < 9 | < 9 |
Well #4 Pump House facility 00104 · sample point 104 · groundwater
| Compound | MRL | 2024-08-01 SE1 | 2024-08-20 SE1 | 2025-02-11 SE2 |
|---|---|---|---|---|
| PFHpA | 3 ppt | – | 4.9 | 5.3 |
| PFHxA | 3 ppt | – | 4.8 | 6 |
| PFHxS | 3 ppt | – | 3.4 | 3.1 |
| PFNA | 4 ppt | – | 7.4 | 8.6 |
| PFOA | 4 ppt | – | 6 | 7.8 |
| PFOS | 4 ppt | – | 4.3 | 5 |
| PFPeA | 3 ppt | – | 7 | 7.1 |
| 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 |
| 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 | < 9 | – | < 9 |
Well #6 Pump House facility 00106 · sample point 106 · groundwater
| Compound | MRL | 2024-08-01 SE1 | 2025-02-11 SE2 |
|---|---|---|---|
| PFBS | 3 ppt | 14.7 | 16.5 |
| PFHxA | 3 ppt | 5 | 4.6 |
| PFHxS | 3 ppt | < 3 | 3.4 |
| PFOA | 4 ppt | 4.1 | 5.1 |
| PFOS | 4 ppt | 7.1 | 8.8 |
| PFPeA | 3 ppt | 6.4 | 6.3 |
| PFUnA | 2 ppt | < 2 | 2.2 |
| 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 |
| PFHpA | 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 |
| lithium | 9 µg/L | < 9 | < 9 |
Well #7 Pump House facility 00107 · sample point 107 · groundwater
| Compound | MRL | 2024-08-01 SE1 | 2025-02-11 SE2 |
|---|---|---|---|
| PFBS | 3 ppt | 3.4 | < 3 |
| PFHpA | 3 ppt | 4.2 | 3.9 |
| PFHxA | 3 ppt | 4.2 | 3.7 |
| PFOA | 4 ppt | 14.9 | 11.4 |
| PFOS | 4 ppt | 4.4 | < 4 |
| PFPeA | 3 ppt | 4.4 | 3.5 |
| 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 |
| 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 |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| PFHxA | 8 | 100% | 41.5 2024-08-01 | 11.97–11.97 | 4.8 | 6 | 41.5 | 41.5 |
| PFOA | 8 | 100% | 22.4 2024-08-01 | 11.04–11.04 | 7.8 | 14.9 | 22.4 | 22.4 |
| PFPeA | 8 | 100% | 51.6 2024-08-01 | 14.74–14.74 | 6.4 | 7.1 | 51.6 | 51.6 |
| PFOS | 8 | 88% | 153 2024-08-01 | 35.45–35.95 | 5 | 8.8 | 153 | 153 |
| PFHpA | 8 | 75% | 30.9 2024-08-01 | 8.38–9.12 | 4.2 | 5.3 | 30.9 | 30.9 |
| PFBS | 8 | 62% | 16.5 2025-02-11 | 5.42–6.55 | 3.4 | 4.9 | 16.5 | 16.5 |
| PFHxS | 8 | 62% | 33.2 2024-08-01 | 8.46–9.59 | 3.1 | 3.4 | 33.2 | 33.2 |
| PFNA | 8 | 50% | 99.8 2024-08-01 | 23.35–25.35 | <MRL | 8.6 | 99.8 | 99.8 |
| PFUnA | 8 | 38% | 22.2 2024-08-01 | 4.89–6.14 | <MRL | 2.2 | 22.2 | 22.2 |
| 6:2 FTS | 8 | 25% | 64.5 2024-08-01 | 12.86–16.61 | <MRL | <MRL | 64.5 | 64.5 |
| 8:2 FTS | 8 | 25% | 41.9 2024-08-01 | 8.32–12.07 | <MRL | <MRL | 41.9 | 41.9 |
| PFBA | 8 | 25% | 13.5 2024-08-01 | 2.81–6.56 | <MRL | <MRL | 13.5 | 13.5 |
| PFDA | 8 | 25% | 7 2024-08-01 | 1.26–3.51 | <MRL | <MRL | 7 | 7 |
Never detected (17): 11Cl-PF3OUdS, 4:2 FTS, 9Cl-PF3ONS, ADONA, HFPO-DA, NEtFOSAA, NFDHA, NMeFOSAA, PFDoA, PFEESA, PFHpS, PFMBA, PFMPA, PFPeS, PFTA, PFTrDA, lithium.
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.