- PWSID
- TX0610019
- State
- Texas
- System type
- community water system (CWS)
- Population served
- 12,720
- City
- Argyle
- Counties
- Denton County
- Primary source water
- surface water (purchased)
- UCMR 5 sampling
- 2023-02-21 to 2024-01-31 · 6 entry point(s) · water types: GW;MX;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
- Utrwd Regional Water Treatment Plant (TX0610213)
Seller not monitored under UCMR 5. - Cross Timbers Wsc (TX0610020)
Seller's highest results: PFOA <MRL · PFOS <MRL · HI 0.88 · detected: 6:2 FTS;PFBA;PFBS;PFHxA;PFHxS;PFPeA - Town Of Northlake (TX0610235)
Seller's highest results: PFOA <MRL · PFOS <MRL · HI 0 · detected: 6:2 FTS;PFBA;PFHxA;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) | <MRL | 0 | 4 |
| PFOS (ppt) | <MRL | 0 | 4 |
| Hazard Index | 0.002 | 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 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 2023-02-21 to 2024-01-31 · 6 entry point(s) · water types: GW;MX;SW · 24 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2023-02-21 | ARGYLE WSC (GW) | SE1 | <4 | <4 | 0 | lithium 37 µg/L |
| 2023-02-21 | ARGYLE WSC - East connection Upper Trinity GST (SW) | SE1 | <4 | <4 | 0 | PFBA 7.3, PFHxA 5.5, PFPeA 5.6 |
| 2023-02-21 | ARGYLE WSC - West connection Upper Trinity GST (SW) | SE1 | <4 | <4 | 0 | PFBA 7.4, PFHxA 5.7, PFPeA 5.3 |
| 2023-02-22 | ARGYLE WSC (GW) | SE1 | <4 | <4 | 0 | lithium 41 µg/L |
| 2023-02-22 | ARGYLE WSC - PS1 (GW) | SE1 | <4 | <4 | 0 | lithium 37 µg/L |
| 2023-02-28 | PS 8 - 200 C TAYLOR RD TP410726 (MX) | SE1 | <4 | <4 | 0 | PFBA 6.1, PFHxA 4.3, PFPeA 4.3, lithium 10 µg/L |
| 2023-05-09 | ARGYLE WSC - East connection Upper Trinity GST (SW) | SE2 | n/a | n/a | n/a | none |
| 2023-05-09 | ARGYLE WSC - West connection Upper Trinity GST (SW) | SE2 | n/a | n/a | n/a | lithium 17.6 µg/L |
| 2023-05-09 | PS 8 - 200 C TAYLOR RD TP410726 (MX) | SE2 | n/a | n/a | n/a | lithium 27.2 µg/L |
| 2023-06-05 | ARGYLE WSC - East connection Upper Trinity GST (SW) | SE2 | n/a | n/a | n/a | none |
| 2023-06-05 | ARGYLE WSC - West connection Upper Trinity GST (SW) | SE2 | <4 | <4 | 0 | none |
| 2023-06-05 | PS 8 - 200 C TAYLOR RD TP410726 (MX) | SE2 | <4 | <4 | 0 | none |
| 2023-08-14 | ARGYLE WSC (GW) | SE2 | <4 | <4 | 0 | lithium 34.7 µg/L |
| 2023-08-14 | ARGYLE WSC (GW) | SE2 | <4 | <4 | 0 | lithium 32.5 µg/L |
| 2023-08-14 | ARGYLE WSC - East connection Upper Trinity GST (SW) | SE2 | <4 | <4 | 0.002 | PFBA 77.2, PFHxA 4.9, PFPeA 5.7 |
| 2023-08-14 | ARGYLE WSC - East connection Upper Trinity GST (SW) | SE3 | <4 | <4 | 0.002 | PFBA 5.1, PFHxA 4.6, PFPeA 4.2, lithium 10.8 µg/L |
| 2023-08-14 | ARGYLE WSC - PS1 (GW) | SE2 | <4 | <4 | 0 | lithium 30.6 µg/L |
| 2023-08-14 | ARGYLE WSC - West connection Upper Trinity GST (SW) | SE3 | <4 | <4 | 0 | PFHxA 4.6, PFPeA 4.1, lithium 10.7 µg/L |
| 2023-08-14 | PS 8 - 200 C TAYLOR RD TP410726 (MX) | SE3 | n/a | n/a | n/a | lithium 14.4 µg/L |
| 2023-11-08 | PS 8 - 200 C TAYLOR RD TP410726 (MX) | SE3 | <4 | <4 | 0.002 | PFBA 6.8, PFHxA 5.6, PFPeA 5.2 |
| 2023-11-14 | ARGYLE WSC - East connection Upper Trinity GST (SW) | SE4 | n/a | n/a | n/a | none |
| 2023-11-14 | ARGYLE WSC - West connection Upper Trinity GST (SW) | SE4 | <4 | <4 | 0.002 | PFBA 6.9, PFHxA 7.5, PFPeA 5.6 |
| 2023-11-14 | PS 8 - 200 C TAYLOR RD TP410726 (MX) | SE4 | <4 | <4 | 0.002 | PFBA 5.7, PFHxA 7.7, PFPeA 5.4 |
| 2024-01-31 | ARGYLE WSC - East connection Upper Trinity GST (SW) | SE4 | <4 | <4 | 0.002 | PFBA 10.7, PFHxA 4.6, 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
540 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.
ARGYLE WSC facility EP003 · sample point TRTTAP · groundwater
| Compound | MRL | 2023-02-22 SE1 | 2023-08-14 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 | 41 | 34.7 |
ARGYLE WSC facility EP005 · sample point TRTTAP · groundwater
| Compound | MRL | 2023-02-21 SE1 | 2023-08-14 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 | 37 | 32.5 |
ARGYLE WSC - East connection Upper Trinity GST facility EP006 · sample point TRTTAP · surface water
| Compound | MRL | 2023-02-21 SE1 | 2023-05-09 SE2 | 2023-06-05 SE2 | 2023-08-14 SE2 | 2023-08-14 SE3 | 2023-11-14 SE4 | 2024-01-31 SE4 |
|---|---|---|---|---|---|---|---|---|
| PFBA | 5 ppt | 7.3 | – | – | 77.2 | 5.1 | – | 10.7 |
| PFBS | 3 ppt | < 3 | – | – | 3.9 | 3.2 | – | 3.3 |
| PFHxA | 3 ppt | 5.5 | – | – | 4.9 | 4.6 | – | 4.6 |
| PFPeA | 3 ppt | 5.6 | – | – | 5.7 | 4.2 | – | 4.9 |
| 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 | – |
| 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 | < 9 | < 9 | – | – | 10.8 | < 9 | – |
ARGYLE WSC - PS1 facility EP001 · sample point TRTTAP · groundwater
| Compound | MRL | 2023-02-22 SE1 | 2023-08-14 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 | 37 | 30.6 |
ARGYLE WSC - West connection Upper Trinity GST facility EP007 · sample point TRTTAP · surface water
| Compound | MRL | 2023-02-21 SE1 | 2023-05-09 SE2 | 2023-06-05 SE2 | 2023-08-14 SE3 | 2023-11-14 SE4 |
|---|---|---|---|---|---|---|
| PFBA | 5 ppt | 7.4 | – | < 5 | < 5 | 6.9 |
| PFBS | 3 ppt | < 3 | – | < 3 | < 3 | 4.1 |
| PFHxA | 3 ppt | 5.7 | – | < 3 | 4.6 | 7.5 |
| PFPeA | 3 ppt | 5.3 | – | < 3 | 4.1 | 5.6 |
| 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 |
| 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 | < 9 | 17.6 | – | 10.7 | < 9 |
PS 8 - 200 C TAYLOR RD TP410726 facility EP008 · sample point EP008 · MX
| Compound | MRL | 2023-02-28 SE1 | 2023-05-09 SE2 | 2023-06-05 SE2 | 2023-08-14 SE3 | 2023-11-08 SE3 | 2023-11-14 SE4 |
|---|---|---|---|---|---|---|---|
| PFBA | 5 ppt | 6.1 | – | < 5 | – | 6.8 | 5.7 |
| PFBS | 3 ppt | < 3 | – | < 3 | – | 4 | 4.3 |
| PFHxA | 3 ppt | 4.3 | – | < 3 | – | 5.6 | 7.7 |
| PFPeA | 3 ppt | 4.3 | – | < 3 | – | 5.2 | 5.4 |
| 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 |
| 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 | 10 | 27.2 | – | 14.4 | – | < 9 |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| lithium | 18 | 67% | 41 2023-02-22 | 16.86–19.86 | 10.8 | 32.5 | 37 | 41 |
| PFHxA | 18 | 56% | 7.7 2023-11-14 | 3.06–4.39 | 4.3 | 5.5 | 7.5 | 7.7 |
| PFPeA | 18 | 56% | 5.7 2023-08-14 | 2.79–4.13 | 4.1 | 5.3 | 5.6 | 5.7 |
| PFBA | 18 | 50% | 77.2 2023-08-14 | 7.4–9.9 | <MRL | 6.9 | 10.7 | 77.2 |
| PFBS | 18 | 33% | 4.3 2023-11-14 | 1.27–3.27 | <MRL | 3.3 | 4.1 | 4.3 |
Never detected (25): 11Cl-PF3OUdS, 4:2 FTS, 6:2 FTS, 8:2 FTS, 9Cl-PF3ONS, ADONA, HFPO-DA, NEtFOSAA, NFDHA, NMeFOSAA, PFDA, PFDoA, PFEESA, PFHpA, PFHpS, PFHxS, 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.