- PWSID
- MD0060015
- State
- Maryland
- System type
- community water system (CWS)
- Population served
- 35,256
- City
- Westminster
- Counties
- Carroll County
- Primary source water
- surface water
- UCMR 5 sampling
- 2023-01-31 to 2025-09-04 · 10 entry point(s) · water types: GU;GW;SW
- Service-area boundary
- authoritative
PFOA ≥ 3 × its limit highest single result
PFOA 1–3 × its limit worst entry-point average
Open on the Maryland map · All Maryland 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) | 12.4 | 11.38 | 4 |
| PFOS (ppt) | 6.9 | 6.65 | 4 |
| Hazard Index | 0.422 | 0.382 | 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).
No Maryland PFAS drinking-water standard in effect or proposed as of 2026-10-17: No Maryland-specific PFAS drinking-water MCL; MDE implementing federal NPDWR.
Sampling history
Sampled 2023-01-31 to 2025-09-04 · 10 entry point(s) · water types: GU;GW;SW · 32 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2023-01-31 | Carfaro Well 7 (GU) | SE1 | <4 | <4 | 0.003 | none |
| 2023-01-31 | Cranberry WTP (SW) | SE1 | <4 | <4 | 0 | none |
| 2023-01-31 | Kriders Church Well 5 WTP (GU) | SE1 | 5.7 | 4.6 | 0.39 | none |
| 2023-04-18 | Carfaro Well 7 (GU) | SE2 | <4 | <4 | 0.003 | none |
| 2023-04-18 | Cranberry WTP (SW) | SE2 | <4 | <4 | 0 | none |
| 2023-04-18 | Kriders Church Well 5 WTP (GU) | SE2 | 5 | 4.1 | 0.34 | none |
| 2023-07-12 | Carfaro Well 7 (GU) | SE3 | <4 | <4 | 0.003 | none |
| 2023-07-12 | Cranberry WTP (SW) | SE3 | <4 | <4 | 0 | none |
| 2023-07-12 | Kriders Church Well 5 WTP (GU) | SE3 | 5.9 | <4 | 0.32 | none |
| 2023-10-05 | Carfaro Well 7 (GU) | SE4 | <4 | <4 | 0.003 | none |
| 2023-10-05 | Cranberry WTP (SW) | SE4 | <4 | <4 | 0.002 | none |
| 2023-10-05 | Kriders Church Well 5 WTP (GU) | SE4 | 5.4 | <4 | 0 | none |
| 2023-11-28 | Carfaro Well 7 (GU) | SE4 | n/a | n/a | n/a | none |
| 2023-11-28 | Kriders Church Well 5 WTP (GU) | SE4 | n/a | n/a | n/a | none |
| 2024-12-03 | Airport Well 4 WTP (GW) | SE1 | <4 | <4 | 0.004 | PFHxA 3.9, PFPeA 4.2 |
| 2024-12-03 | Center Street Well 6 WTP (GW) | SE1 | 7.3 | 6.9 | 0.002 | PFBA 8.2, PFHpA 8.1, PFHxA 24.6, PFPeA 26.5 |
| 2024-12-03 | County Shop Well 3 WTP (GW) | SE1 | <4 | <4 | 0 | none |
| 2024-12-03 | Gesell WTP (GU) | SE1 | 11.4 | <4 | 0.382 | PFHpA 3.5, PFHxA 5.1, PFPeA 4 |
| 2024-12-03 | Koontz Prop Wells 9 & 10 (GW) | SE1 | <4 | <4 | 0.004 | PFHxA 3, PFPeA 3.4 |
| 2024-12-03 | Roops Mill (GW) | SE1 | <4 | <4 | 0 | none |
| 2024-12-18 | Votech Well 8 WTP (GW) | SE1 | n/a | n/a | n/a | none |
| 2025-01-08 | Votech Well 8 WTP (GW) | SE1 | <4 | <4 | 0 | PFBA 20.1, PFPeA 51.3 |
| 2025-03-03 | Gesell WTP (GU) | SE2 | 10.4 | <4 | 0.362 | PFHpA 3.1, PFHxA 4.8, PFPeA 3.9 |
| 2025-06-10 | Airport Well 4 WTP (GW) | SE2 | <4 | <4 | 0.004 | PFHxA 3.9, PFPeA 4.1 |
| 2025-06-10 | Center Street Well 6 WTP (GW) | SE2 | n/a | n/a | n/a | none |
| 2025-06-10 | County Shop Well 3 WTP (GW) | SE2 | <4 | <4 | 0 | none |
| 2025-07-01 | Center Street Well 6 WTP (GW) | SE2 | 6.7 | 6.4 | 0.002 | PFBA 8.1, PFHpA 7.3, PFHxA 23.2, PFPeA 24.3 |
| 2025-07-01 | Gesell WTP (GU) | SE3 | 11.3 | <4 | 0.362 | PFHpA 3.2, PFHxA 4.9, PFPeA 4 |
| 2025-07-01 | Koontz Prop Wells 9 & 10 (GW) | SE2 | <4 | <4 | 0.004 | PFHxA 3.2, PFPeA 3.7 |
| 2025-07-01 | Roops Mill (GW) | SE2 | <4 | <4 | 0 | none |
| 2025-07-01 | Votech Well 8 WTP (GW) | SE2 | <4 | <4 | 0 | PFBA 18.8, PFHxA 5.9, PFPeA 66.7 |
| 2025-09-04 | Gesell WTP (GU) | SE4 | 12.4 | <4 | 0.422 | PFHpA 3.6, PFHxA 5.4, PFPeA 4.2 |
“<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
840 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.
Airport Well 4 WTP facility 25846 · sample point TP03 · groundwater
| Compound | MRL | 2024-12-03 SE1 | 2025-06-10 SE2 |
|---|---|---|---|
| PFBS | 3 ppt | 8.4 | 8.6 |
| PFHxA | 3 ppt | 3.9 | 3.9 |
| PFPeA | 3 ppt | 4.2 | 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 |
| 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 |
| 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 |
Carfaro Well 7 facility 00008 · sample point 0800000 · groundwater under the influence of surface water
| Compound | MRL | 2023-01-31 SE1 | 2023-04-18 SE2 | 2023-07-12 SE3 | 2023-10-05 SE4 | 2023-11-28 SE4 |
|---|---|---|---|---|---|---|
| PFBS | 3 ppt | 5.6 | 6.2 | 6.1 | 5.2 | – |
| 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 | – |
| 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 | – |
Center Street Well 6 WTP facility 25847 · sample point TP04 · groundwater
| Compound | MRL | 2024-12-03 SE1 | 2025-06-10 SE2 | 2025-07-01 SE2 |
|---|---|---|---|---|
| PFBA | 5 ppt | 8.2 | – | 8.1 |
| PFBS | 3 ppt | 3.9 | – | 3.9 |
| PFHpA | 3 ppt | 8.1 | – | 7.3 |
| PFHxA | 3 ppt | 24.6 | – | 23.2 |
| PFOA | 4 ppt | 7.3 | – | 6.7 |
| PFOS | 4 ppt | 6.9 | – | 6.4 |
| PFPeA | 3 ppt | 26.5 | – | 24.3 |
| 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 | < 9 | < 9 | – |
County Shop Well 3 WTP facility 25845 · sample point TP02 · groundwater
| Compound | MRL | 2024-12-03 SE1 | 2025-06-10 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 |
Cranberry WTP facility 00001 · sample point 0100000 · surface water
| Compound | MRL | 2023-01-31 SE1 | 2023-04-18 SE2 | 2023-07-12 SE3 | 2023-10-05 SE4 |
|---|---|---|---|---|---|
| PFBS | 3 ppt | < 3 | < 3 | < 3 | 3.8 |
| 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 |
| 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 |
Gesell WTP facility 29609 · sample point TP10 · groundwater under the influence of surface water
| Compound | MRL | 2024-12-03 SE1 | 2025-03-03 SE2 | 2025-07-01 SE3 | 2025-09-04 SE4 |
|---|---|---|---|---|---|
| PFBS | 3 ppt | 3.4 | 3.4 | 3.4 | 4 |
| PFHpA | 3 ppt | 3.5 | 3.1 | 3.2 | 3.6 |
| PFHxA | 3 ppt | 5.1 | 4.8 | 4.9 | 5.4 |
| PFHxS | 3 ppt | 3.8 | 3.6 | 3.6 | 4.2 |
| PFOA | 4 ppt | 11.4 | 10.4 | 11.3 | 12.4 |
| PFPeA | 3 ppt | 4 | 3.9 | 4 | 4.2 |
| 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 |
| PFHpS | 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 |
| PFOS | 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 | < 9 | < 9 | < 9 | < 9 |
Koontz Prop Wells 9 & 10 facility 25850 · sample point TP07 · groundwater
| Compound | MRL | 2024-12-03 SE1 | 2025-07-01 SE2 |
|---|---|---|---|
| PFBS | 3 ppt | 8.4 | 8.2 |
| PFHxA | 3 ppt | 3 | 3.2 |
| PFPeA | 3 ppt | 3.4 | 3.7 |
| 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 |
| PFOA | 4 ppt | < 4 | < 4 |
| PFOS | 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 |
Kriders Church Well 5 WTP facility 00005 · sample point 0500000 · groundwater under the influence of surface water
| Compound | MRL | 2023-01-31 SE1 | 2023-04-18 SE2 | 2023-07-12 SE3 | 2023-10-05 SE4 | 2023-11-28 SE4 |
|---|---|---|---|---|---|---|
| PFHxS | 3 ppt | 3.9 | 3.4 | 3.2 | < 3 | – |
| PFOA | 4 ppt | 5.7 | 5 | 5.9 | 5.4 | – |
| PFOS | 4 ppt | 4.6 | 4.1 | < 4 | < 4 | – |
| 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 | – |
| PFMBA | 3 ppt | < 3 | < 3 | < 3 | < 3 | – |
| PFMPA | 4 ppt | < 4 | < 4 | < 4 | < 4 | – |
| PFNA | 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 | – |
Roops Mill facility 25852 · sample point TP09 · groundwater
| Compound | MRL | 2024-12-03 SE1 | 2025-07-01 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 |
Votech Well 8 WTP facility 25849 · sample point TP06 · groundwater
| Compound | MRL | 2024-12-18 SE1 | 2025-01-08 SE1 | 2025-07-01 SE2 |
|---|---|---|---|---|
| PFBA | 5 ppt | – | 20.1 | 18.8 |
| PFHxA | 3 ppt | – | < 3 | 5.9 |
| PFPeA | 3 ppt | – | 51.3 | 66.7 |
| 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 |
| 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 |
| 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 |
| 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 |
|---|---|---|---|---|---|---|---|---|
| PFBS | 28 | 54% | 8.6 2025-06-10 | 2.95–4.34 | 3.4 | 5.2 | 8.4 | 8.4 |
| PFPeA | 28 | 43% | 66.7 2025-07-01 | 7.15–8.87 | <MRL | 4 | 26.5 | 51.3 |
| PFHxA | 28 | 39% | 24.6 2024-12-03 | 3.14–4.96 | <MRL | 3.9 | 5.9 | 23.2 |
| PFOA | 28 | 36% | 12.4 2025-09-04 | 2.91–5.48 | <MRL | 5.7 | 11.3 | 11.4 |
| PFHxS | 28 | 25% | 4.2 2025-09-04 | 0.92–3.17 | <MRL | <MRL | 3.8 | 3.9 |
| PFHpA | 28 | 21% | 8.1 2024-12-03 | 1.03–3.39 | <MRL | <MRL | 3.6 | 7.3 |
| PFBA | 28 | 14% | 20.1 2025-01-08 | 1.97–6.26 | <MRL | <MRL | 8.2 | 18.8 |
| PFOS | 28 | 14% | 6.9 2024-12-03 | 0.79–4.21 | <MRL | <MRL | 4.6 | 6.4 |
Never detected (22): 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, PFNA, PFPeS, PFTA, PFTrDA, PFUnA, 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 2023-01-04 to 2026-05-19; 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 a5d4ffe50da4 · 2026-10-18T04:05Z · UCMR 5 release Jul2026 · SDWIS 2026Q3. Data and methods.