- PWSID
- TX1080029
- State
- Texas
- System type
- community water system (CWS)
- Population served
- 171,195
- City
- Edinburg
- Counties
- Cameron County, Hidalgo County, Willacy County
- Primary source water
- surface water
- UCMR 5 sampling
- 2023-02-15 to 2024-02-13 · 7 entry point(s) · water types: GW;SW
- Service-area boundary
- authoritative
Hazard Index below its limit highest single result
Hazard Index below its limit worst entry-point average
Open on the Texas map · All Texas 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
- City Of Raymondville (TX2450001)
Seller's highest results: PFOA <MRL · PFOS <MRL · HI 0 · detected: PFBA - City Of Weslaco (TX1080011)
Seller's highest results: PFOA <MRL · PFOS 5.9 ppt · HI 0.58 · detected: PFBA;PFHpA;PFHxA;PFHxS;PFOS;PFPeA - City Of Edinburg (TX1080004)
Seller's highest results: PFOA <MRL · PFOS 4.5 ppt · HI 0.002 · detected: PFBA;PFBS;PFOS - City Of Mercedes (TX1080007)
Seller's highest results: PFOA <MRL · PFOS <MRL · HI 0 · detected: PFHxA - North Cameron Regional Water Treatment F (TX0310152; no record in the map data)
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) | <MRL | 0 | 4 |
| PFOS (ppt) | <MRL | 0 | 4 |
| Hazard Index | 0.34 | 0.085 | 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 Texas PFAS drinking-water standard in effect or proposed as of 2026-10-17: No state PFAS drinking-water standard; TCEQ implementing federal NPDWR (BCLP state survey, Jan 2026).
Sampling history
Sampled 2023-02-15 to 2024-02-13 · 7 entry point(s) · water types: GW;SW · 30 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2023-02-15 | La Sara RO (GW) | SE1 | <4 | <4 | 0 | lithium 36.7 µg/L |
| 2023-02-15 | Plant 1 (SW) | SE1 | <4 | <4 | 0 | lithium 20.9 µg/L |
| 2023-02-15 | Plant 2 (SW) | SE1 | <4 | <4 | 0 | lithium 37.9 µg/L |
| 2023-02-15 | Plant 4 (SW) | SE1 | <4 | <4 | 0 | lithium 33.8 µg/L |
| 2023-02-15 | Plant 5 (SW) | SE1 | <4 | <4 | 0 | lithium 43.5 µg/L |
| 2023-02-15 | Plant 6 (Monte Alto) (SW) | SE1 | n/a | n/a | n/a | lithium 47.7 µg/L |
| 2023-02-15 | Plant 7 (SW) | SE1 | <4 | <4 | 0 | PFHxA 3.2, lithium 45.9 µg/L |
| 2023-05-08 | Plant 2 (SW) | SE2 | <4 | <4 | 0 | lithium 38.4 µg/L |
| 2023-05-08 | Plant 4 (SW) | SE2 | <4 | <4 | 0 | lithium 30.9 µg/L |
| 2023-05-08 | Plant 5 (SW) | SE2 | <4 | <4 | 0 | PFBA 5.6, lithium 40.5 µg/L |
| 2023-05-08 | Plant 6 (Monte Alto) (SW) | SE2 | <4 | <4 | 0 | lithium 42 µg/L |
| 2023-05-08 | Plant 7 (SW) | SE2 | <4 | <4 | 0.34 | lithium 48.2 µg/L |
| 2023-05-15 | Plant 1 (SW) | SE2 | <4 | <4 | 0 | lithium 39.2 µg/L |
| 2023-08-08 | La Sara RO (GW) | SE2 | <4 | <4 | 0 | lithium 25.1 µg/L |
| 2023-08-08 | Plant 1 (SW) | SE3 | <4 | <4 | 0 | lithium 25.6 µg/L |
| 2023-08-08 | Plant 2 (SW) | SE3 | n/a | n/a | n/a | lithium 39.3 µg/L |
| 2023-08-08 | Plant 4 (SW) | SE3 | <4 | <4 | 0 | PFBA 5.2, lithium 29.8 µg/L |
| 2023-08-08 | Plant 5 (SW) | SE3 | <4 | <4 | 0 | PFBA 6.6, lithium 39.5 µg/L |
| 2023-08-08 | Plant 6 (Monte Alto) (SW) | SE3 | <4 | <4 | 0 | PFBA 7.3, lithium 43.6 µg/L |
| 2023-08-08 | Plant 7 (SW) | SE3 | <4 | <4 | 0.002 | PFBA 7.2, lithium 46.9 µg/L |
| 2023-11-06 | Plant 1 (SW) | SE4 | <4 | <4 | 0 | lithium 26.5 µg/L |
| 2023-11-06 | Plant 2 (SW) | SE4 | <4 | <4 | 0 | PFBA 6.7, lithium 42.6 µg/L |
| 2023-11-06 | Plant 4 (SW) | SE4 | <4 | <4 | 0 | PFBA 5.9, lithium 35.6 µg/L |
| 2023-11-06 | Plant 5 (SW) | SE4 | <4 | <4 | 0 | PFBA 5.9, lithium 39.9 µg/L |
| 2023-11-06 | Plant 6 (Monte Alto) (SW) | SE4 | <4 | <4 | 0 | PFBA 8.6, PFPeA 3.5, lithium 50 µg/L |
| 2023-11-06 | Plant 7 (SW) | SE4 | <4 | <4 | 0 | PFBA 12.2, lithium 43.8 µg/L |
| 2023-12-12 | Plant 2 (SW) | SE3 | <4 | <4 | 0 | PFBA 9 |
| 2023-12-12 | Plant 6 (Monte Alto) (SW) | SE1 | <4 | <4 | 0 | PFBA 11.9, PFHxA 3.5, PFPeA 3.8 |
| 2023-12-12 | Plant 7 (SW) | SE3 | n/a | n/a | n/a | none |
| 2024-02-13 | Plant 7 (SW) | SE4 | n/a | n/a | n/a | 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
780 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.
La Sara RO facility 62402 · sample point EP009MC7 · groundwater
| Compound | MRL | 2023-02-15 SE1 | 2023-08-08 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 | 36.7 | 25.1 |
Plant 1 facility 54195 · sample point EP001MC1 · surface water
| Compound | MRL | 2023-02-15 SE1 | 2023-05-15 SE2 | 2023-08-08 SE3 | 2023-11-06 SE4 |
|---|---|---|---|---|---|
| 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 |
| 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 | 20.9 | 39.2 | 25.6 | 26.5 |
Plant 2 facility 54191 · sample point EP002MC2 · surface water
| Compound | MRL | 2023-02-15 SE1 | 2023-05-08 SE2 | 2023-08-08 SE3 | 2023-11-06 SE4 | 2023-12-12 SE3 |
|---|---|---|---|---|---|---|
| PFBA | 5 ppt | < 5 | < 5 | – | 6.7 | 9 |
| 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 | – |
| 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 |
| 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 | 37.9 | 38.4 | 39.3 | 42.6 | – |
Plant 4 facility 54192 · sample point EP004MC4 · surface water
| Compound | MRL | 2023-02-15 SE1 | 2023-05-08 SE2 | 2023-08-08 SE3 | 2023-11-06 SE4 |
|---|---|---|---|---|---|
| PFBA | 5 ppt | < 5 | < 5 | 5.2 | 5.9 |
| 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 |
| 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 |
| 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 | 33.8 | 30.9 | 29.8 | 35.6 |
Plant 5 facility 54193 · sample point EP005MC5 · surface water
| Compound | MRL | 2023-02-15 SE1 | 2023-05-08 SE2 | 2023-08-08 SE3 | 2023-11-06 SE4 |
|---|---|---|---|---|---|
| PFBA | 5 ppt | < 5 | 5.6 | 6.6 | 5.9 |
| 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 |
| 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 |
| 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 | 43.5 | 40.5 | 39.5 | 39.9 |
Plant 6 (Monte Alto) facility 54189 · sample point EP008MC6 · surface water
| Compound | MRL | 2023-02-15 SE1 | 2023-05-08 SE2 | 2023-08-08 SE3 | 2023-11-06 SE4 | 2023-12-12 SE1 |
|---|---|---|---|---|---|---|
| PFBA | 5 ppt | – | < 5 | 7.3 | 8.6 | 11.9 |
| PFHxA | 3 ppt | – | < 3 | < 3 | < 3 | 3.5 |
| PFPeA | 3 ppt | – | < 3 | < 3 | 3.5 | 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 | – |
| 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 |
| 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 |
| 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 | 47.7 | 42 | 43.6 | 50 | – |
Plant 7 facility 54196 · sample point EP010MC7 · surface water
| Compound | MRL | 2023-02-15 SE1 | 2023-05-08 SE2 | 2023-08-08 SE3 | 2023-11-06 SE4 | 2023-12-12 SE3 | 2024-02-13 SE4 |
|---|---|---|---|---|---|---|---|
| PFBA | 5 ppt | < 5 | < 5 | 7.2 | 12.2 | – | – |
| PFBS | 3 ppt | < 3 | < 3 | 3 | < 3 | – | – |
| PFHxA | 3 ppt | 3.2 | < 3 | < 3 | < 3 | – | – |
| PFHxS | 3 ppt | < 3 | 3.4 | < 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 | – | – |
| PFHpA | 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 | – | – |
| 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 | 45.9 | 48.2 | 46.9 | 43.8 | – | – |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| lithium | 26 | 100% | 50 2023-11-06 | 38.22–38.22 | 39.3 | 43.6 | 47.7 | 48.2 |
| PFBA | 26 | 46% | 12.2 2023-11-06 | 3.54–6.23 | <MRL | 6.7 | 9 | 11.9 |
| PFHxA | 26 | 8% | 3.5 2023-12-12 | 0.26–3.03 | <MRL | <MRL | <MRL | 3.2 |
| PFPeA | 26 | 8% | 3.8 2023-12-12 | 0.28–3.05 | <MRL | <MRL | <MRL | 3.5 |
| PFBS | 26 | 4% | 3 2023-08-08 | 0.12–3 | <MRL | <MRL | <MRL | <MRL |
| PFHxS | 26 | 4% | 3.4 2023-05-08 | 0.13–3.02 | <MRL | <MRL | <MRL | <MRL |
Never detected (24): 11Cl-PF3OUdS, 4:2 FTS, 6:2 FTS, 8:2 FTS, 9Cl-PF3ONS, ADONA, HFPO-DA, NEtFOSAA, NFDHA, NMeFOSAA, PFDA, PFDoA, PFEESA, PFHpA, PFHpS, PFMBA, PFMPA, PFNA, PFOA, PFOS, 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 2026-06-16; 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 a6f3d99247ed · 2026-10-18T04:13Z · UCMR 5 release Jul2026 · SDWIS 2026Q3. Data and methods.