- PWSID
- SC2620004
- State
- South Carolina
- System type
- community water system (CWS)
- Population served
- 252,840
- City
- Conway
- Counties
- Dillon County, Horry County, Marion County
- Primary source water
- surface water
- UCMR 5 sampling
- 2023-07-17 to 2024-05-20 · 7 entry point(s) · water types: GW;MX;SW
- Service-area boundary
- authoritative
PFOS 1–3 × its limit highest single result
PFOA 1–3 × its limit worst entry-point average
Open on the South Carolina map · All South Carolina 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) | 11.4 | 6.23 | 4 |
| PFOS (ppt) | 11.5 | 6.1 | 4 |
| Hazard Index | 0.003 | 0.001 | 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 South Carolina PFAS drinking-water standard in effect or proposed as of 2026-10-17: No state PFAS drinking-water standard; H. 3116 and H. 5572 (2025-26) pending, not enacted.
Sampling history
Sampled 2023-07-17 to 2024-05-20 · 7 entry point(s) · water types: GW;MX;SW · 28 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2023-07-17 | Bay Road Blend Well (MX) | SE1 | <4 | <4 | 0 | lithium 9.54 µg/L |
| 2023-07-17 | Bull Creek Plant (SW) | SE1 | 9.3 | 11.5 | 0.002 | PFBA 6.9, PFHpA 3.9, PFHxA 6, PFPeA 8.9 |
| 2023-07-17 | Conway Blend Well (MX) | SE1 | <4 | <4 | 0 | lithium 11.4 µg/L |
| 2023-07-17 | Green Sea Floyds Well (GW) | SE1 | <4 | <4 | 0 | none |
| 2023-07-17 | Long Bay Road Well (GW) | SE1 | <4 | <4 | 0 | lithium 30.1 µg/L |
| 2023-07-17 | Perry Road Blend Well (MX) | SE1 | <4 | <4 | 0 | lithium 12.7 µg/L |
| 2023-10-03 | Bay Road Blend Well (MX) | SE2 | 9.5 | 8.7 | 0.002 | PFBA 5.5, PFHpA 3.9, PFHxA 6, PFPeA 9.1 |
| 2023-10-03 | Bull Creek Plant (SW) | SE2 | <4 | <4 | 0 | lithium 10.6 µg/L |
| 2023-10-03 | Conway Blend Well (MX) | SE2 | 11.4 | 10.2 | 0.003 | PFBA 7.2, PFHpA 4.8, PFHxA 7.2, PFPeA 11.8 |
| 2023-10-03 | Perry Road Blend Well (MX) | SE2 | 9.7 | 8.9 | 0.002 | PFBA 6.1, PFHpA 4.1, PFHxA 6.2, PFPeA 9.2 |
| 2023-10-03 | Tern Hall Blend Well (MX) | SE2 | 10.7 | 9.9 | 0.003 | PFBA 6.9, PFHpA 4.6, PFHxA 6.8, PFPeA 10.2 |
| 2023-12-18 | Bull Creek Plant (SW) | SE3 | 6.3 | 6 | 0.002 | PFHpA 3.2, PFHxA 5.5, PFPeA 5.3 |
| 2024-01-08 | Bay Road Blend Well (MX) | SE3 | n/a | n/a | n/a | none |
| 2024-01-08 | Bull Creek Plant (SW) | SE2 | n/a | n/a | n/a | none |
| 2024-01-08 | Conway Blend Well (MX) | SE3 | <4 | <4 | 0 | lithium 10.7 µg/L |
| 2024-01-08 | Green Sea Floyds Well (GW) | SE2 | <4 | <4 | 0 | none |
| 2024-01-08 | Long Bay Road Well (GW) | SE2 | <4 | <4 | 0 | lithium 29.5 µg/L |
| 2024-01-08 | Perry Road Blend Well (MX) | SE3 | n/a | n/a | n/a | lithium 12 µg/L |
| 2024-01-08 | Tern Hall Blend Well (MX) | SE3 | n/a | n/a | n/a | none |
| 2024-04-16 | Bay Road Blend Well (MX) | SE4 | 9.2 | 9.6 | 0.002 | PFHpA 3.6, PFHxA 4.9, PFPeA 6.7 |
| 2024-04-16 | Bull Creek Plant (SW) | SE4 | n/a | n/a | n/a | none |
| 2024-04-16 | Conway Blend Well (MX) | SE4 | n/a | n/a | n/a | lithium 11.3 µg/L |
| 2024-04-16 | Perry Road Blend Well (MX) | SE4 | n/a | n/a | n/a | none |
| 2024-04-16 | Tern Hall Blend Well (MX) | SE4 | n/a | n/a | n/a | none |
| 2024-05-20 | Bull Creek Plant (SW) | SE4 | <4 | <4 | 0 | none |
| 2024-05-20 | Conway Blend Well (MX) | SE4 | 5.3 | 6.7 | 0 | PFHxA 3.3, PFPeA 4.6 |
| 2024-05-20 | Perry Road Blend Well (MX) | SE4 | 4.8 | 6.4 | 0 | PFHxA 3.2, PFPeA 4.3 |
| 2024-05-20 | Tern Hall Blend Well (MX) | SE4 | <4 | <4 | 0 | none |
“<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
615 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.
Bay Road Blend Well facility 26164 · sample point BAYROADBLENDWELL · MX
| Compound | MRL | 2023-07-17 SE1 | 2023-10-03 SE2 | 2024-01-08 SE3 | 2024-04-16 SE4 |
|---|---|---|---|---|---|
| PFBA | 5 ppt | < 5 | 5.5 | – | < 5 |
| PFBS | 3 ppt | < 3 | 4.6 | – | 3.7 |
| PFHpA | 3 ppt | < 3 | 3.9 | – | 3.6 |
| PFHxA | 3 ppt | < 3 | 6 | – | 4.9 |
| PFOA | 4 ppt | < 4 | 9.5 | – | 9.2 |
| PFOS | 4 ppt | < 4 | 8.7 | – | 9.6 |
| PFPeA | 3 ppt | < 3 | 9.1 | – | 6.7 |
| 11Cl-PF3OUdS | 5 ppt | < 5 | < 5 | – | < 5 |
| 4:2 FTS | 3 ppt | < 3 | < 3 | – | < 3 |
| 6:2 FTS | 5 ppt | < 5 | < 5 | – | < 5 |
| 8:2 FTS | 5 ppt | < 5 | < 5 | – | < 5 |
| 9Cl-PF3ONS | 2 ppt | < 2 | < 2 | – | < 2 |
| ADONA | 3 ppt | < 3 | < 3 | – | < 3 |
| HFPO-DA | 5 ppt | < 5 | < 5 | – | < 5 |
| NEtFOSAA | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| NFDHA | 20 ppt | < 20 | < 20 | – | < 20 |
| NMeFOSAA | 6 ppt | < 6 | < 6 | < 6 | < 6 |
| PFDA | 3 ppt | < 3 | < 3 | – | < 3 |
| PFDoA | 3 ppt | < 3 | < 3 | – | < 3 |
| PFEESA | 3 ppt | < 3 | < 3 | – | < 3 |
| PFHpS | 3 ppt | < 3 | < 3 | – | < 3 |
| PFHxS | 3 ppt | < 3 | < 3 | – | < 3 |
| PFMBA | 3 ppt | < 3 | < 3 | – | < 3 |
| PFMPA | 4 ppt | < 4 | < 4 | – | < 4 |
| PFNA | 4 ppt | < 4 | < 4 | – | < 4 |
| PFPeS | 4 ppt | < 4 | < 4 | – | < 4 |
| PFTA | 8 ppt | < 8 | < 8 | < 8 | < 8 |
| PFTrDA | 7 ppt | < 7 | < 7 | < 7 | < 7 |
| PFUnA | 2 ppt | < 2 | < 2 | – | < 2 |
| lithium | 9 µg/L | 9.54 | < 9 | < 9 | < 9 |
Bull Creek Plant facility 26001 · sample point A26001 · surface water
| Compound | MRL | 2023-07-17 SE1 | 2023-10-03 SE2 | 2023-12-18 SE3 | 2024-01-08 SE2 | 2024-04-16 SE4 | 2024-05-20 SE4 |
|---|---|---|---|---|---|---|---|
| PFBA | 5 ppt | 6.9 | < 5 | < 5 | – | – | < 5 |
| PFBS | 3 ppt | 3.7 | < 3 | 4 | – | – | < 3 |
| PFHpA | 3 ppt | 3.9 | < 3 | 3.2 | – | – | < 3 |
| PFHxA | 3 ppt | 6 | < 3 | 5.5 | – | – | < 3 |
| PFOA | 4 ppt | 9.3 | < 4 | 6.3 | – | – | < 4 |
| PFOS | 4 ppt | 11.5 | < 4 | 6 | – | – | < 4 |
| PFPeA | 3 ppt | 8.9 | < 3 | 5.3 | – | – | < 3 |
| 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 |
| 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 |
| 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 | 10.6 | < 9 | – | < 9 | – |
Conway Blend Well facility 26440 · sample point CONWAYBLENDWELL · MX
| Compound | MRL | 2023-07-17 SE1 | 2023-10-03 SE2 | 2024-01-08 SE3 | 2024-04-16 SE4 | 2024-05-20 SE4 |
|---|---|---|---|---|---|---|
| PFBA | 5 ppt | < 5 | 7.2 | < 5 | – | < 5 |
| PFBS | 3 ppt | < 3 | 5.6 | < 3 | – | < 3 |
| PFHpA | 3 ppt | < 3 | 4.8 | < 3 | – | < 3 |
| PFHxA | 3 ppt | < 3 | 7.2 | < 3 | – | 3.3 |
| PFOA | 4 ppt | < 4 | 11.4 | < 4 | – | 5.3 |
| PFOS | 4 ppt | < 4 | 10.2 | < 4 | – | 6.7 |
| PFPeA | 3 ppt | < 3 | 11.8 | < 3 | – | 4.6 |
| 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 |
| 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 |
| 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 | 11.4 | < 9 | 10.7 | 11.3 | – |
Green Sea Floyds Well facility 26452 · sample point GREENSEAFLOYDSWELL · groundwater
| Compound | MRL | 2023-07-17 SE1 | 2024-01-08 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 |
Long Bay Road Well facility 26269 · sample point LONGBAYROADWELL · groundwater
| Compound | MRL | 2023-07-17 SE1 | 2024-01-08 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 | 30.1 | 29.5 |
Perry Road Blend Well facility 26451 · sample point PERRYROADBLENDWELL · MX
| Compound | MRL | 2023-07-17 SE1 | 2023-10-03 SE2 | 2024-01-08 SE3 | 2024-04-16 SE4 | 2024-05-20 SE4 |
|---|---|---|---|---|---|---|
| PFBA | 5 ppt | < 5 | 6.1 | – | – | < 5 |
| PFBS | 3 ppt | < 3 | 4.9 | – | – | < 3 |
| PFHpA | 3 ppt | < 3 | 4.1 | – | – | < 3 |
| PFHxA | 3 ppt | < 3 | 6.2 | – | – | 3.2 |
| PFOA | 4 ppt | < 4 | 9.7 | – | – | 4.8 |
| PFOS | 4 ppt | < 4 | 8.9 | – | – | 6.4 |
| PFPeA | 3 ppt | < 3 | 9.2 | – | – | 4.3 |
| 11Cl-PF3OUdS | 5 ppt | < 5 | < 5 | – | – | < 5 |
| 4:2 FTS | 3 ppt | < 3 | < 3 | – | – | < 3 |
| 6:2 FTS | 5 ppt | < 5 | < 5 | – | – | < 5 |
| 8:2 FTS | 5 ppt | < 5 | < 5 | – | – | < 5 |
| 9Cl-PF3ONS | 2 ppt | < 2 | < 2 | – | – | < 2 |
| ADONA | 3 ppt | < 3 | < 3 | – | – | < 3 |
| HFPO-DA | 5 ppt | < 5 | < 5 | – | – | < 5 |
| NEtFOSAA | 5 ppt | < 5 | < 5 | < 5 | < 5 | – |
| NFDHA | 20 ppt | < 20 | < 20 | – | – | < 20 |
| NMeFOSAA | 6 ppt | < 6 | < 6 | < 6 | < 6 | – |
| PFDA | 3 ppt | < 3 | < 3 | – | – | < 3 |
| PFDoA | 3 ppt | < 3 | < 3 | – | – | < 3 |
| PFEESA | 3 ppt | < 3 | < 3 | – | – | < 3 |
| PFHpS | 3 ppt | < 3 | < 3 | – | – | < 3 |
| PFHxS | 3 ppt | < 3 | < 3 | – | – | < 3 |
| PFMBA | 3 ppt | < 3 | < 3 | – | – | < 3 |
| PFMPA | 4 ppt | < 4 | < 4 | – | – | < 4 |
| PFNA | 4 ppt | < 4 | < 4 | – | – | < 4 |
| PFPeS | 4 ppt | < 4 | < 4 | – | – | < 4 |
| PFTA | 8 ppt | < 8 | < 8 | < 8 | < 8 | – |
| PFTrDA | 7 ppt | < 7 | < 7 | < 7 | < 7 | – |
| PFUnA | 2 ppt | < 2 | < 2 | – | – | < 2 |
| lithium | 9 µg/L | 12.7 | < 9 | 12 | < 9 | – |
Tern Hall Blend Well facility 26146 · sample point TERNHALLBLENDWELL · MX
| Compound | MRL | 2023-10-03 SE2 | 2024-01-08 SE3 | 2024-04-16 SE4 | 2024-05-20 SE4 |
|---|---|---|---|---|---|
| PFBA | 5 ppt | 6.9 | – | – | < 5 |
| PFBS | 3 ppt | 5.3 | – | – | < 3 |
| PFHpA | 3 ppt | 4.6 | – | – | < 3 |
| PFHxA | 3 ppt | 6.8 | – | – | < 3 |
| PFOA | 4 ppt | 10.7 | – | – | < 4 |
| PFOS | 4 ppt | 9.9 | – | – | < 4 |
| PFPeA | 3 ppt | 10.2 | – | – | < 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 | < 5 | – |
| NFDHA | 20 ppt | < 20 | – | – | < 20 |
| NMeFOSAA | 6 ppt | < 6 | < 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 | < 8 | – |
| PFTrDA | 7 ppt | < 7 | < 7 | < 7 | – |
| PFUnA | 2 ppt | < 2 | – | – | < 2 |
| lithium | 9 µg/L | < 9 | < 9 | < 9 | – |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| PFHxA | 20 | 45% | 7.2 2023-10-03 | 2.46–4.11 | <MRL | 5.5 | 6.2 | 6.8 |
| PFOA | 20 | 45% | 11.4 2023-10-03 | 3.81–6.01 | <MRL | 9.2 | 9.7 | 10.7 |
| PFOS | 20 | 45% | 11.5 2023-07-17 | 3.9–6.09 | <MRL | 8.7 | 9.9 | 10.2 |
| PFPeA | 20 | 45% | 11.8 2023-10-03 | 3.5–5.16 | <MRL | 6.7 | 9.2 | 10.2 |
| lithium | 23 | 39% | 30.1 2023-07-17 | 5.99–11.47 | <MRL | 11.3 | 12.7 | 29.5 |
| PFBS | 20 | 35% | 5.6 2023-10-03 | 1.59–3.54 | <MRL | 3.7 | 4.9 | 5.3 |
| PFHpA | 20 | 35% | 4.8 2023-10-03 | 1.41–3.35 | <MRL | 3.6 | 4.1 | 4.6 |
| PFBA | 20 | 25% | 7.2 2023-10-03 | 1.63–5.38 | <MRL | <MRL | 6.9 | 6.9 |
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, PFHxS, PFMBA, PFMPA, PFNA, 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 2023-01-09 to 2026-06-15; 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 04c4b5704fe9 · 2026-10-18T04:07Z · UCMR 5 release Jul2026 · SDWIS 2026Q3. Data and methods.