- PWSID
- LA1079001
- State
- Louisiana
- System type
- community water system (CWS)
- Population served
- 66,798
- City
- Alexandria
- Counties
- Rapides Parish
- Primary source water
- groundwater
- UCMR 5 sampling
- 2023-05-24 to 2024-08-27 · 10 entry point(s) · water types: GW
- Service-area boundary
- EPA-modeled (Random Forest) — approximate: estimated by EPA with a statistical model, not a surveyed service area
No PFAS detected highest single result
No PFAS detected worst entry-point average
Open on the Louisiana map · All Louisiana 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) | <MRL | 0 | 4 |
| PFOS (ppt) | <MRL | 0 | 4 |
| Hazard Index | 0 | 0 | 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 Louisiana PFAS drinking-water standard in effect or proposed as of 2026-10-17: No state PFAS drinking-water standard; follows federal NPDWR (BCLP state survey, Jan 2026).
Sampling history
Sampled 2023-05-24 to 2024-08-27 · 10 entry point(s) · water types: GW · 26 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2023-05-24 | Armory Well (GW) | SE1 | n/a | n/a | n/a | lithium 32.2 µg/L |
| 2023-05-24 | Betty Street Well TP (GW) | SE1 | n/a | n/a | n/a | lithium 10.8 µg/L |
| 2023-05-24 | Hamilton St. Tank TP (GW) | SE1 | <4 | <4 | 0 | lithium 19.2 µg/L |
| 2023-05-24 | Hwy 1 South Well (GW) | SE1 | n/a | n/a | n/a | lithium 15.4 µg/L |
| 2023-05-24 | Hwy. 1 Wells TP (GW) | SE1 | n/a | n/a | n/a | lithium 49.8 µg/L |
| 2023-05-24 | Jones St. Well TP (GW) | SE1 | n/a | n/a | n/a | lithium 49.9 µg/L |
| 2023-05-24 | Kisatchie Wells TP (GW) | SE1 | <4 | <4 | 0 | lithium 15.1 µg/L |
| 2023-05-24 | Masonic Wells TP (GW) | SE1 | <4 | <4 | 0 | lithium 21.3 µg/L |
| 2023-05-24 | Sterkx TP (GW) | SE1 | n/a | n/a | n/a | lithium 18.4 µg/L |
| 2023-06-12 | Armory Well (GW) | SE1 | <4 | <4 | 0 | none |
| 2023-06-12 | Betty Street Well TP (GW) | SE1 | <4 | <4 | 0 | none |
| 2023-06-12 | Hwy 1 South Well (GW) | SE1 | <4 | <4 | 0 | none |
| 2023-06-12 | Sterkx TP (GW) | SE1 | <4 | <4 | 0 | none |
| 2023-07-10 | Hwy. 1 Wells TP (GW) | SE1 | <4 | <4 | 0 | none |
| 2023-11-14 | Armory Well (GW) | SE2 | <4 | <4 | 0 | lithium 48.7 µg/L |
| 2023-11-14 | Hamilton St. Tank TP (GW) | SE2 | <4 | <4 | 0 | lithium 25.3 µg/L |
| 2023-11-14 | Hwy 1 South Well (GW) | SE2 | <4 | <4 | 0 | lithium 25.5 µg/L |
| 2023-11-14 | Hwy. 1 Wells TP (GW) | SE2 | <4 | <4 | 0 | lithium 65.7 µg/L |
| 2023-11-14 | Jones St. Well TP (GW) | SE2 | n/a | n/a | n/a | lithium 95.2 µg/L |
| 2023-11-14 | Kisatchie Wells TP (GW) | SE2 | <4 | <4 | 0 | lithium 16.2 µg/L |
| 2023-11-14 | Masonic Wells TP (GW) | SE2 | <4 | <4 | 0 | lithium 23.5 µg/L |
| 2023-11-14 | Sterkx TP (GW) | SE2 | <4 | <4 | 0 | lithium 24.7 µg/L |
| 2024-01-31 | Armory Well (GW) | SE2 | n/a | n/a | n/a | none |
| 2024-02-27 | Hwy. 28 Wells TP (GW) | SE1 | <4 | <4 | 0 | lithium 22.9 µg/L |
| 2024-06-25 | Betty Street Well TP (GW) | SE2 | <4 | <4 | 0 | lithium 9.7 µg/L |
| 2024-08-27 | Hwy. 28 Wells TP (GW) | SE2 | <4 | <4 | 0 | lithium 23.1 µg/L |
“<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
550 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.
Armory Well facility 44103 · sample point 61PW · groundwater
| Compound | MRL | 2023-05-24 SE1 | 2023-06-12 SE1 | 2023-11-14 SE2 | 2024-01-31 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 | 32.2 | – | 48.7 | – |
Betty Street Well TP facility 44036 · sample point 6IQF · groundwater
| Compound | MRL | 2023-05-24 SE1 | 2023-06-12 SE1 | 2024-06-25 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 | 10.8 | – | 9.7 |
Hamilton St. Tank TP facility 44101 · sample point TP010 · groundwater
| Compound | MRL | 2023-05-24 SE1 | 2023-11-14 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 | 19.2 | 25.3 |
Hwy 1 South Well facility 44102 · sample point POE161 · groundwater
| Compound | MRL | 2023-05-24 SE1 | 2023-06-12 SE1 | 2023-11-14 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 | 15.4 | – | 25.5 |
Hwy. 1 Wells TP facility 44006 · sample point 6IPX · groundwater
| Compound | MRL | 2023-05-24 SE1 | 2023-07-10 SE1 | 2023-11-14 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 | 49.8 | – | 65.7 |
Hwy. 28 Wells TP facility 44005 · sample point 6IPY · groundwater
| Compound | MRL | 2024-02-27 SE1 | 2024-08-27 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 | 22.9 | 23.1 |
Jones St. Well TP facility 44100 · sample point POE135 · groundwater
| Compound | MRL | 2023-05-24 SE1 | 2023-11-14 SE2 |
|---|---|---|---|
| NEtFOSAA | 5 ppt | < 5 | < 5 |
| NMeFOSAA | 6 ppt | < 6 | < 6 |
| PFTA | 8 ppt | < 8 | < 8 |
| PFTrDA | 7 ppt | < 7 | < 7 |
| lithium | 9 µg/L | 49.9 | 95.2 |
Kisatchie Wells TP facility 44001 · sample point 6JZW · groundwater
| Compound | MRL | 2023-05-24 SE1 | 2023-11-14 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 | 15.1 | 16.2 |
Masonic Wells TP facility 44003 · sample point 6IPZ · groundwater
| Compound | MRL | 2023-05-24 SE1 | 2023-11-14 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 | 21.3 | 23.5 |
Sterkx TP facility 44061 · sample point 6APP · groundwater
| Compound | MRL | 2023-05-24 SE1 | 2023-06-12 SE1 | 2023-11-14 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 | 18.4 | – | 24.7 |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| lithium | 20 | 100% | 95.2 2023-11-14 | 30.63–30.63 | 23.1 | 32.2 | 49.9 | 65.7 |
Never detected (29): 11Cl-PF3OUdS, 4:2 FTS, 6:2 FTS, 8:2 FTS, 9Cl-PF3ONS, ADONA, HFPO-DA, NEtFOSAA, NFDHA, NMeFOSAA, PFBA, PFBS, PFDA, PFDoA, PFEESA, PFHpA, PFHpS, PFHxA, PFHxS, PFMBA, PFMPA, PFNA, PFOA, PFOS, PFPeA, 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 2026-05-12; 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 6e7fb171ec63 · 2026-10-18T04:08Z · UCMR 5 release Jul2026 · SDWIS 2026Q3. Data and methods.