- PWSID
- MD0070011
- State
- Maryland
- System type
- community water system (CWS)
- Population served
- 15,625
- City
- Elkton
- Counties
- Cecil County
- Primary source water
- surface water
- UCMR 5 sampling
- 2024-06-17 to 2025-06-30 · 5 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 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.
Water purchased from
- Artesian Water Company (DE0000552)
Seller's highest results: PFOA 23.1 ppt · PFOS 6 ppt · HI 0.892 · detected: PFBA;PFBS;PFHpA;PFHxA;PFHxS;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) | 23.3 | 22.65 | 4 |
| PFOS (ppt) | 7.1 | 7.05 | 4 |
| Hazard Index | 0.443 | 0.428 | 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 2024-06-17 to 2025-06-30 · 5 entry point(s) · water types: GW;SW · 11 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2024-06-17 | Big Elk Creek Filter Plant (SW) | SE1 | 4.7 | <4 | 0 | PFHxA 4.3, PFPeA 3.9 |
| 2024-06-17 | Well 1 (GW) | SE1 | 16.3 | 4.4 | 0.306 | PFBA 8.1, PFHpA 6.3, PFHxA 12.8, PFPeA 14.4 |
| 2024-06-17 | Well 3 (GW) | SE1 | 22 | 7.1 | 0.413 | PFBA 8.4, PFHpA 6.3, PFHxA 10.7, PFPeA 9.8 |
| 2024-06-17 | Well 5 (GW) | SE1 | <4 | <4 | 0 | none |
| 2024-09-12 | Big Elk Creek Filter Plant (SW) | SE2 | 4.4 | <4 | 0.002 | PFHxA 5.6, PFPeA 4.5 |
| 2024-12-19 | Big Elk Creek Filter Plant (SW) | SE3 | 5.6 | <4 | 0 | PFBA 6.1, PFHxA 5.6, PFPeA 5.1 |
| 2024-12-19 | Well 1 (GW) | SE2 | 16.9 | 4.1 | 0.006 | PFBA 7.8, PFHpA 6.2, PFHxA 11.6, PFPeA 12.6 |
| 2024-12-19 | Well 3 (GW) | SE2 | 23.3 | 7 | 0.443 | PFBA 8.4, PFHpA 6.5, PFHxA 10.5, PFPeA 9.5 |
| 2024-12-19 | Well 5 (GW) | SE2 | <4 | <4 | 0 | none |
| 2025-03-17 | Big Elk Creek Filter Plant (SW) | SE4 | <4 | <4 | 0 | PFHxA 4, PFPeA 3.2 |
| 2025-06-30 | Well 2R (GW) | SE1 | 16.2 | <4 | 0.006 | PFBA 8.6, PFHpA 6.2, PFHxA 10.9, PFPeA 11.7 |
“<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
330 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.
Big Elk Creek Filter Plant facility 00001 · sample point 0100000 · surface water
| Compound | MRL | 2024-06-17 SE1 | 2024-09-12 SE2 | 2024-12-19 SE3 | 2025-03-17 SE4 |
|---|---|---|---|---|---|
| PFBA | 5 ppt | < 5 | < 5 | 6.1 | < 5 |
| PFBS | 3 ppt | < 3 | 3 | < 3 | < 3 |
| PFHxA | 3 ppt | 4.3 | 5.6 | 5.6 | 4 |
| PFOA | 4 ppt | 4.7 | 4.4 | 5.6 | < 4 |
| PFPeA | 3 ppt | 3.9 | 4.5 | 5.1 | 3.2 |
| 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 |
| 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 |
| 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 |
Well 1 facility 00003 · sample point 0300000 · groundwater
| Compound | MRL | 2024-06-17 SE1 | 2024-12-19 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | 8.1 | 7.8 |
| PFBS | 3 ppt | 12.3 | 12.1 |
| PFHpA | 3 ppt | 6.3 | 6.2 |
| PFHxA | 3 ppt | 12.8 | 11.6 |
| PFHxS | 3 ppt | 3 | < 3 |
| PFOA | 4 ppt | 16.3 | 16.9 |
| PFOS | 4 ppt | 4.4 | 4.1 |
| PFPeA | 3 ppt | 14.4 | 12.6 |
| 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 |
| 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 |
Well 2R facility 00004 · sample point 0400000 · groundwater
| Compound | MRL | 2025-06-30 SE1 |
|---|---|---|
| PFBA | 5 ppt | 8.6 |
| PFBS | 3 ppt | 11.8 |
| PFHpA | 3 ppt | 6.2 |
| PFHxA | 3 ppt | 10.9 |
| PFOA | 4 ppt | 16.2 |
| PFPeA | 3 ppt | 11.7 |
| 11Cl-PF3OUdS | 5 ppt | < 5 |
| 4:2 FTS | 3 ppt | < 3 |
| 6:2 FTS | 5 ppt | < 5 |
| 8:2 FTS | 5 ppt | < 5 |
| 9Cl-PF3ONS | 2 ppt | < 2 |
| ADONA | 3 ppt | < 3 |
| HFPO-DA | 5 ppt | < 5 |
| NEtFOSAA | 5 ppt | < 5 |
| NFDHA | 20 ppt | < 20 |
| NMeFOSAA | 6 ppt | < 6 |
| PFDA | 3 ppt | < 3 |
| PFDoA | 3 ppt | < 3 |
| PFEESA | 3 ppt | < 3 |
| PFHpS | 3 ppt | < 3 |
| PFHxS | 3 ppt | < 3 |
| PFMBA | 3 ppt | < 3 |
| PFMPA | 4 ppt | < 4 |
| PFNA | 4 ppt | < 4 |
| PFOS | 4 ppt | < 4 |
| PFPeS | 4 ppt | < 4 |
| PFTA | 8 ppt | < 8 |
| PFTrDA | 7 ppt | < 7 |
| PFUnA | 2 ppt | < 2 |
| lithium | 9 µg/L | < 9 |
Well 3 facility 00002 · sample point 0200000 · groundwater
| Compound | MRL | 2024-06-17 SE1 | 2024-12-19 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | 8.4 | 8.4 |
| PFBS | 3 ppt | 6.5 | 6.6 |
| PFHpA | 3 ppt | 6.3 | 6.5 |
| PFHxA | 3 ppt | 10.7 | 10.5 |
| PFHxS | 3 ppt | 4.1 | 4.4 |
| PFOA | 4 ppt | 22 | 23.3 |
| PFOS | 4 ppt | 7.1 | 7 |
| PFPeA | 3 ppt | 9.8 | 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 |
| 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 | < 9 | < 9 |
Well 5 facility 00005 · sample point 0500000 · groundwater
| Compound | MRL | 2024-06-17 SE1 | 2024-12-19 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 |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| PFHxA | 11 | 82% | 12.8 2024-06-17 | 6.91–7.45 | 5.6 | 10.9 | 11.6 | 12.8 |
| PFPeA | 11 | 82% | 14.4 2024-06-17 | 6.79–7.34 | 5.1 | 11.7 | 12.6 | 14.4 |
| PFOA | 11 | 73% | 23.3 2024-12-19 | 9.95–11.04 | 5.6 | 16.9 | 22 | 23.3 |
| PFBA | 11 | 54% | 8.6 2025-06-30 | 4.31–6.58 | 6.1 | 8.4 | 8.4 | 8.6 |
| PFBS | 11 | 54% | 12.3 2024-06-17 | 4.75–6.12 | 3 | 11.8 | 12.1 | 12.3 |
| PFHpA | 11 | 46% | 6.5 2024-12-19 | 2.86–4.5 | <MRL | 6.3 | 6.3 | 6.5 |
| PFOS | 11 | 36% | 7.1 2024-06-17 | 2.05–4.6 | <MRL | 4.4 | 7 | 7.1 |
| PFHxS | 11 | 27% | 4.4 2024-12-19 | 1.05–3.23 | <MRL | 3 | 4.1 | 4.4 |
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.