- PWSID
- TX0610020
- State
- Texas
- System type
- community water system (CWS)
- Population served
- 8,751
- City
- Argyle
- Counties
- Denton County
- Primary source water
- surface water (purchased)
- UCMR 5 sampling
- 2023-03-06 to 2024-02-12 · 4 entry point(s) · water types: 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. - Denton County Fwsd 7 (TX0610228)
Seller's highest results: PFOA <MRL · PFOS <MRL · HI 0.002 · detected: PFBA;PFBS;PFHxA;PFPeA - Argyle Wsc (TX0610019)
Seller's highest results: PFOA <MRL · PFOS <MRL · HI 0.002 · detected: PFBA;PFBS;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 | 0.88 | 0.22 | 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 2023-03-06 to 2024-02-12 · 4 entry point(s) · water types: SW · 24 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2023-03-06 | Connection to Upper Trinity (SW) | SE1 | <4 | <4 | 0 | none |
| 2023-03-06 | Jernigan (SW) | SE1 | <4 | <4 | 0 | lithium 46.9 µg/L |
| 2023-03-06 | Stargate (SW) | SE1 | n/a | n/a | n/a | lithium 36.9 µg/L |
| 2023-03-06 | Stonewood (SW) | SE1 | n/a | n/a | n/a | lithium 42.2 µg/L |
| 2023-06-14 | Connection to Upper Trinity (SW) | SE2 | <4 | <4 | 0 | PFHxA 3.5, PFPeA 3.6 |
| 2023-06-14 | Jernigan (SW) | SE2 | <4 | <4 | 0 | lithium 40.2 µg/L |
| 2023-06-14 | Stargate (SW) | SE1 | <4 | <4 | 0 | none |
| 2023-06-14 | Stargate (SW) | SE2 | <4 | <4 | 0 | lithium 34.3 µg/L |
| 2023-06-14 | Stonewood (SW) | SE1 | <4 | <4 | 0.88 | none |
| 2023-06-14 | Stonewood (SW) | SE2 | <4 | <4 | 0 | lithium 34.4 µg/L |
| 2023-09-19 | Connection to Upper Trinity (SW) | SE2 | n/a | n/a | n/a | none |
| 2023-09-19 | Connection to Upper Trinity (SW) | SE3 | n/a | n/a | n/a | none |
| 2023-09-19 | Stargate (SW) | SE3 | <4 | <4 | 0 | lithium 32.8 µg/L |
| 2023-09-19 | Stargate (SW) | SE2 | n/a | n/a | n/a | none |
| 2023-09-20 | Stonewood (SW) | SE3 | <4 | <4 | 0 | lithium 37.5 µg/L |
| 2023-09-20 | Stonewood (SW) | SE2 | n/a | n/a | n/a | none |
| 2023-10-02 | Jernigan (SW) | SE2 | n/a | n/a | n/a | none |
| 2023-11-29 | Connection to Upper Trinity (SW) | SE4 | <4 | <4 | 0.002 | PFHxA 5.4, PFPeA 4.8, lithium 13.9 µg/L |
| 2023-11-29 | Jernigan (SW) | SE3 | <4 | <4 | 0 | lithium 42.1 µg/L |
| 2023-11-29 | Stargate (SW) | SE4 | <4 | <4 | 0 | 6:2 FTS 441, lithium 35.6 µg/L |
| 2023-11-29 | Stonewood (SW) | SE4 | <4 | <4 | 0 | lithium 40.4 µg/L |
| 2023-12-18 | Connection to Upper Trinity (SW) | SE3 | <4 | <4 | 0.002 | PFBA 9, PFHxA 3.8, PFPeA 4.1 |
| 2024-02-12 | Jernigan (SW) | SE4 | <4 | <4 | 0 | lithium 45.8 µg/L |
| 2024-02-12 | Stonewood (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
480 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.
Connection to Upper Trinity facility EP007 · sample point TRTTAP · surface water
| Compound | MRL | 2023-03-06 SE1 | 2023-06-14 SE2 | 2023-09-19 SE2 | 2023-09-19 SE3 | 2023-11-29 SE4 | 2023-12-18 SE3 |
|---|---|---|---|---|---|---|---|
| PFBA | 5 ppt | < 5 | < 5 | – | – | < 5 | 9 |
| PFBS | 3 ppt | < 3 | < 3 | – | – | 3.6 | 3.5 |
| PFHxA | 3 ppt | < 3 | 3.5 | – | – | 5.4 | 3.8 |
| PFPeA | 3 ppt | < 3 | 3.6 | – | – | 4.8 | 4.1 |
| 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 | – | < 9 | 13.9 | – |
Jernigan facility EP004 · sample point TRTTAP · surface water
| Compound | MRL | 2023-03-06 SE1 | 2023-06-14 SE2 | 2023-10-02 SE2 | 2023-11-29 SE3 | 2024-02-12 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 | 46.9 | 40.2 | – | 42.1 | 45.8 |
Stargate facility EP008 · sample point TRTTAP · surface water
| Compound | MRL | 2023-03-06 SE1 | 2023-06-14 SE1 | 2023-06-14 SE2 | 2023-09-19 SE2 | 2023-09-19 SE3 | 2023-11-29 SE4 |
|---|---|---|---|---|---|---|---|
| 6:2 FTS | 5 ppt | – | < 5 | < 5 | – | < 5 | 441 |
| 11Cl-PF3OUdS | 5 ppt | – | < 5 | < 5 | – | < 5 | < 5 |
| 4:2 FTS | 3 ppt | – | < 3 | < 3 | – | < 3 | < 3 |
| 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 | 36.9 | – | 34.3 | – | 32.8 | 35.6 |
Stonewood facility EP001 · sample point TRTTAP · surface water
| Compound | MRL | 2023-03-06 SE1 | 2023-06-14 SE1 | 2023-06-14 SE2 | 2023-09-20 SE2 | 2023-09-20 SE3 | 2023-11-29 SE4 | 2024-02-12 SE4 |
|---|---|---|---|---|---|---|---|---|
| PFHxS | 3 ppt | – | 8.8 | < 3 | – | < 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 |
| 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 | – |
| 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 | 42.2 | – | 34.4 | – | 37.5 | 40.4 | – |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| lithium | 16 | 81% | 46.9 2023-03-06 | 30.19–31.88 | 35.6 | 40.4 | 45.8 | 46.9 |
| PFHxA | 16 | 19% | 5.4 2023-11-29 | 0.79–3.23 | <MRL | <MRL | 3.8 | 5.4 |
| PFPeA | 16 | 19% | 4.8 2023-11-29 | 0.78–3.22 | <MRL | <MRL | 4.1 | 4.8 |
| PFBS | 16 | 12% | 3.6 2023-11-29 | 0.44–3.07 | <MRL | <MRL | 3.5 | 3.6 |
| 6:2 FTS | 16 | 6% | 441 2023-11-29 | 27.56–32.25 | <MRL | <MRL | <MRL | 441 |
| PFBA | 16 | 6% | 9 2023-12-18 | 0.56–5.25 | <MRL | <MRL | <MRL | 9 |
| PFHxS | 16 | 6% | 8.8 2023-06-14 | 0.55–3.36 | <MRL | <MRL | <MRL | 8.8 |
Never detected (23): 11Cl-PF3OUdS, 4:2 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.