- PWSID
- DE0000592
- State
- Delaware
- System type
- community water system (CWS)
- Population served
- 7,259
- City
- Georgetown
- Counties
- Sussex County
- Primary source water
- groundwater
- UCMR 5 sampling
- 2025-03-05 to 2025-10-22 · 2 entry point(s) · water types: GW
- Service-area boundary
- EPA-modeled (Decision Tree) — approximate: estimated by EPA with a statistical model, not a surveyed service area
PFOA ≥ 3 × its limit highest single result
PFOA ≥ 3 × its limit worst entry-point average
Open on the Delaware map · All Delaware 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) | 36 | 18 | 4 |
| PFOS (ppt) | 14 | 13.5 | 4 |
| Hazard Index | 2.504 | 2.259 | 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 Delaware standards
| Highest single result | Worst entry-point average* | Delaware | |
|---|---|---|---|
| PFOA (ppt) | 36 | 18 | 4 |
| PFOS (ppt) | 14 | 13.5 | 4 |
| PFNA (ppt) | 20 | 17.5 | 10 |
| PFHxS (ppt) | 5.1 | 5.05 | 10 |
| HFPO-DA (GenX) (ppt) | 0 | 0 | 10 |
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 2025-03-05 to 2025-10-22 · 2 entry point(s) · water types: GW · 4 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2025-03-05 | GEORGETOWN WATER DEPARTMENT (GW) | SE1 | 11 | 14 | 2.014 | PFHpA 4.5, PFHxA 4.9, PFPeA 4.3 |
| 2025-03-05 | GEORGETOWN WATER DEPARTMENT (GW) | SE1 | <4 | <4 | 0 | none |
| 2025-09-09 | GEORGETOWN WATER DEPARTMENT (GW) | SE2 | 36 | 6.1 | 2 | 6:2 FTS 180, 8:2 FTS 30, PFBA 24, PFHpA 39, PFHxA 68, PFPeA 110 |
| 2025-10-22 | GEORGETOWN WATER DEPARTMENT (GW) | SE2 | 12 | 13 | 2.504 | PFHpA 4.9, PFHxA 4.8, PFPeA 4.9 |
“<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
120 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.
GEORGETOWN WATER DEPARTMENT facility TP001 · sample point DEP001 · groundwater
| Compound | MRL | 2025-03-05 SE1 | 2025-10-22 SE2 |
|---|---|---|---|
| PFBS | 3 ppt | 7.5 | 7.5 |
| PFHpA | 3 ppt | 4.5 | 4.9 |
| PFHxA | 3 ppt | 4.9 | 4.8 |
| PFHxS | 3 ppt | 5.1 | 5 |
| PFNA | 4 ppt | 15 | 20 |
| PFOA | 4 ppt | 11 | 12 |
| PFOS | 4 ppt | 14 | 13 |
| PFPeA | 3 ppt | 4.3 | 4.9 |
| 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 |
| 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 |
GEORGETOWN WATER DEPARTMENT facility TP004 · sample point DEP004 · groundwater
| Compound | MRL | 2025-03-05 SE1 | 2025-09-09 SE2 |
|---|---|---|---|
| 6:2 FTS | 5 ppt | < 5 | 180 |
| 8:2 FTS | 5 ppt | < 5 | 30 |
| PFBA | 5 ppt | < 5 | 24 |
| PFHpA | 3 ppt | < 3 | 39 |
| PFHxA | 3 ppt | < 3 | 68 |
| PFNA | 4 ppt | < 4 | 20 |
| PFOA | 4 ppt | < 4 | 36 |
| PFOS | 4 ppt | < 4 | 6.1 |
| PFPeA | 3 ppt | < 3 | 110 |
| 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 |
| 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 | < 9 | < 9 |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| PFHpA | 4 | 75% | 39 2025-09-09 | 12.1–12.85 | 4.5 | 4.9 | 39 | 39 |
| PFHxA | 4 | 75% | 68 2025-09-09 | 19.43–20.18 | 4.8 | 4.9 | 68 | 68 |
| PFNA | 4 | 75% | 20 2025-09-09 | 13.75–14.75 | 15 | 20 | 20 | 20 |
| PFOA | 4 | 75% | 36 2025-09-09 | 14.75–15.75 | 11 | 12 | 36 | 36 |
| PFOS | 4 | 75% | 14 2025-03-05 | 8.28–9.28 | 6.1 | 13 | 14 | 14 |
| PFPeA | 4 | 75% | 110 2025-09-09 | 29.8–30.55 | 4.3 | 4.9 | 110 | 110 |
| PFBS | 4 | 50% | 7.5 2025-03-05 | 3.75–5.25 | <MRL | 7.5 | 7.5 | 7.5 |
| PFHxS | 4 | 50% | 5.1 2025-03-05 | 2.52–4.03 | <MRL | 5 | 5.1 | 5.1 |
| 6:2 FTS | 4 | 25% | 180 2025-09-09 | 45–48.75 | <MRL | <MRL | 180 | 180 |
| 8:2 FTS | 4 | 25% | 30 2025-09-09 | 7.5–11.25 | <MRL | <MRL | 30 | 30 |
| PFBA | 4 | 25% | 24 2025-09-09 | 6–9.75 | <MRL | <MRL | 24 | 24 |
Never detected (19): 11Cl-PF3OUdS, 4:2 FTS, 9Cl-PF3ONS, ADONA, HFPO-DA, NEtFOSAA, NFDHA, NMeFOSAA, PFDA, PFDoA, PFEESA, PFHpS, PFMBA, PFMPA, 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 2023-01-11 to 2025-10-22; 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 ff8be640d9aa · 2026-10-18T04:03Z · UCMR 5 release Jul2026 · SDWIS 2026Q3. Data and methods.