- PWSID
- TX0570048
- State
- Texas
- System type
- community water system (CWS)
- Population served
- 201,843
- City
- Grand Prairie
- Counties
- Dallas County, Ellis County, Tarrant County
- Primary source water
- surface water (purchased)
- UCMR 5 sampling
- 2024-05-07 to 2025-02-03 · 5 entry point(s) · water types: SW
- Service-area boundary
- authoritative
PFOS ≥ 3 × its limit highest single result
PFOS ≥ 3 × 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 Arlington (TX2200001)
Seller's highest results: PFOA <MRL · PFOS 4.6 ppt · HI 0.003 · detected: PFBA;PFBS;PFHxA;PFOS;PFPeA - City Of Mansfield (TX2200018)
Seller's highest results: PFOA <MRL · PFOS <MRL · HI 0 · detected: PFBA;PFHxA;PFPeA - Dallas Water Utility (TX0570004)
Seller's highest results: PFOA 6.3 ppt · PFOS 5.1 ppt · HI 0.384 · detected: PFBA;PFBS;PFHpA;PFHxA;PFHxS;PFOA;PFOS;PFPeA - City Of Grand Prairie (TX0570048)
Seller's highest results: PFOA 4.9 ppt · PFOS 82 ppt · HI 0.333 · detected: PFBA;PFBS;PFHpA;PFHxA;PFHxS;PFOA;PFOS;PFPeA - City Of Fort Worth (TX2200012)
Seller's highest results: PFOA 8.3 ppt · PFOS 7.3 ppt · HI 2.583 · detected: PFBA;PFBS;PFHxA;PFHxS;PFOA;PFOS;PFPeA - City Of Midlothian (TX0700005)
Seller's highest results: PFOA 4.8 ppt · PFOS <MRL · HI 0.002 · detected: PFBA;PFBS;PFHpA;PFHxA;PFOA;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) | 4.9 | 1.23 | 4 |
| PFOS (ppt) | 82 | 22.6 | 4 |
| Hazard Index | 0.333 | 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 2024-05-07 to 2025-02-03 · 5 entry point(s) · water types: SW · 21 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2024-05-07 | City of Dallas South (SW) | SE1 | <4 | 4.1 | 0.002 | PFBA 9.2, PFHxA 5.5, PFPeA 6 |
| 2024-05-07 | Dallas Water Intertie (SW) | SE1 | <4 | <4 | 0.002 | PFBA 7.8, PFHxA 6.3, PFPeA 6.5 |
| 2024-05-07 | Fort Worth Water Intertie (SW) | SE1 | <4 | <4 | 0 | PFBA 5.8 |
| 2024-05-07 | I/C CITY OF MANSFIELD (SW) | SE1 | <4 | <4 | 0 | PFBA 6.2, PFHxA 3, PFPeA 3.3 |
| 2024-05-07 | Midlothian I/C (SW) | SE1 | <4 | <4 | 0.002 | PFBA 6.1, PFHxA 5.3, PFPeA 6.3 |
| 2024-08-13 | City of Dallas South (SW) | SE2 | <4 | 82 | 0.002 | PFBA 8.6, PFHxA 4.2, PFPeA 4.6 |
| 2024-08-13 | Dallas Water Intertie (SW) | SE2 | n/a | n/a | n/a | none |
| 2024-08-13 | Fort Worth Water Intertie (SW) | SE2 | <4 | <4 | 0 | PFBA 6.3 |
| 2024-08-13 | I/C CITY OF MANSFIELD (SW) | SE2 | <4 | <4 | 0 | PFBA 6.2 |
| 2024-08-13 | Midlothian I/C (SW) | SE2 | 4.1 | <4 | 0.002 | PFBA 8.8, PFHpA 3.5, PFHxA 8.7, PFPeA 9.6, lithium 11.3 µg/L |
| 2024-09-16 | Dallas Water Intertie (SW) | SE2 | 4.9 | 5.2 | 0.333 | PFBA 12.2, PFHpA 3.6, PFHxA 11.5, PFPeA 11.7 |
| 2024-11-05 | City of Dallas South (SW) | SE3 | <4 | 4.3 | 0 | PFBA 7, PFHxA 3.3 |
| 2024-11-05 | Dallas Water Intertie (SW) | SE3 | <4 | <4 | 0.002 | PFBA 10.9, PFHxA 5.8, PFPeA 6.2 |
| 2024-11-05 | Fort Worth Water Intertie (SW) | SE3 | <4 | <4 | 0 | PFBA 6.4 |
| 2024-11-05 | I/C CITY OF MANSFIELD (SW) | SE3 | <4 | <4 | 0 | PFBA 8.6, PFPeA 3.1 |
| 2024-11-05 | Midlothian I/C (SW) | SE3 | <4 | 4.5 | 0 | PFBA 7.2, PFHxA 3.3, PFPeA 3, lithium 12.1 µg/L |
| 2025-02-03 | City of Dallas South (SW) | SE4 | <4 | <4 | 0.002 | PFBA 9.3, PFHxA 4.8, PFPeA 5 |
| 2025-02-03 | Dallas Water Intertie (SW) | SE4 | <4 | <4 | 0.002 | PFBA 8.1, PFHxA 6.9, PFPeA 7 |
| 2025-02-03 | Fort Worth Water Intertie (SW) | SE4 | <4 | <4 | 0 | PFBA 6.1 |
| 2025-02-03 | I/C CITY OF MANSFIELD (SW) | SE4 | <4 | <4 | 0 | none |
| 2025-02-03 | Midlothian I/C (SW) | 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
600 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.
City of Dallas South facility 34638 · sample point EP010 · surface water
| Compound | MRL | 2024-05-07 SE1 | 2024-08-13 SE2 | 2024-11-05 SE3 | 2025-02-03 SE4 |
|---|---|---|---|---|---|
| PFBA | 5 ppt | 9.2 | 8.6 | 7 | 9.3 |
| PFBS | 3 ppt | 4.3 | 3.3 | < 3 | 3.7 |
| PFHxA | 3 ppt | 5.5 | 4.2 | 3.3 | 4.8 |
| PFOS | 4 ppt | 4.1 | 82 | 4.3 | < 4 |
| PFPeA | 3 ppt | 6 | 4.6 | < 3 | 5 |
| 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 |
| 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 | < 9 |
Dallas Water Intertie facility 34639 · sample point EP001 · surface water
| Compound | MRL | 2024-05-07 SE1 | 2024-08-13 SE2 | 2024-09-16 SE2 | 2024-11-05 SE3 | 2025-02-03 SE4 |
|---|---|---|---|---|---|---|
| PFBA | 5 ppt | 7.8 | – | 12.2 | 10.9 | 8.1 |
| PFBS | 3 ppt | 3.6 | – | 5.1 | 3.3 | 4.1 |
| PFHpA | 3 ppt | < 3 | – | 3.6 | < 3 | < 3 |
| PFHxA | 3 ppt | 6.3 | – | 11.5 | 5.8 | 6.9 |
| PFHxS | 3 ppt | < 3 | – | 3.3 | < 3 | < 3 |
| PFOA | 4 ppt | < 4 | – | 4.9 | < 4 | < 4 |
| PFOS | 4 ppt | < 4 | – | 5.2 | < 4 | < 4 |
| PFPeA | 3 ppt | 6.5 | – | 11.7 | 6.2 | 7 |
| 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 |
| 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 | < 9 | – | < 9 | < 9 |
Fort Worth Water Intertie facility 34640 · sample point EP002 · surface water
| Compound | MRL | 2024-05-07 SE1 | 2024-08-13 SE2 | 2024-11-05 SE3 | 2025-02-03 SE4 |
|---|---|---|---|---|---|
| PFBA | 5 ppt | 5.8 | 6.3 | 6.4 | 6.1 |
| 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 |
| 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 | < 9 | < 9 | < 9 | < 9 |
I/C CITY OF MANSFIELD facility 11449 · sample point EP016 · surface water
| Compound | MRL | 2024-05-07 SE1 | 2024-08-13 SE2 | 2024-11-05 SE3 | 2025-02-03 SE4 |
|---|---|---|---|---|---|
| PFBA | 5 ppt | 6.2 | 6.2 | 8.6 | < 5 |
| PFHxA | 3 ppt | 3 | < 3 | < 3 | < 3 |
| PFPeA | 3 ppt | 3.3 | < 3 | 3.1 | < 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 |
| 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 | < 9 | < 9 | < 9 | < 9 |
Midlothian I/C facility 11448 · sample point EP015 · surface water
| Compound | MRL | 2024-05-07 SE1 | 2024-08-13 SE2 | 2024-11-05 SE3 | 2025-02-03 SE4 |
|---|---|---|---|---|---|
| PFBA | 5 ppt | 6.1 | 8.8 | 7.2 | < 5 |
| PFBS | 3 ppt | 3.2 | 3.9 | < 3 | < 3 |
| PFHpA | 3 ppt | < 3 | 3.5 | < 3 | < 3 |
| PFHxA | 3 ppt | 5.3 | 8.7 | 3.3 | < 3 |
| PFOA | 4 ppt | < 4 | 4.1 | < 4 | < 4 |
| PFOS | 4 ppt | < 4 | < 4 | 4.5 | < 4 |
| PFPeA | 3 ppt | 6.3 | 9.6 | 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 | 11.3 | 12.1 | < 9 |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| PFBA | 20 | 90% | 12.2 2024-09-16 | 7.04–7.54 | 7 | 8.6 | 9.3 | 10.9 |
| PFHxA | 20 | 60% | 11.5 2024-09-16 | 3.43–4.63 | 3.3 | 5.5 | 6.9 | 8.7 |
| PFPeA | 20 | 60% | 11.7 2024-09-16 | 3.62–4.82 | 3.1 | 6.2 | 7 | 9.6 |
| PFBS | 20 | 45% | 5.1 2024-09-16 | 1.73–3.38 | <MRL | 3.6 | 4.1 | 4.3 |
| PFOS | 20 | 25% | 82 2024-08-13 | 5–8.01 | <MRL | <MRL | 4.5 | 5.2 |
| PFHpA | 20 | 10% | 3.6 2024-09-16 | 0.35–3.06 | <MRL | <MRL | <MRL | 3.5 |
| PFOA | 20 | 10% | 4.9 2024-09-16 | 0.45–4.05 | <MRL | <MRL | <MRL | 4.1 |
| lithium | 20 | 10% | 12.1 2024-11-05 | 1.17–9.27 | <MRL | <MRL | <MRL | 11.3 |
| PFHxS | 20 | 5% | 3.3 2024-09-16 | 0.17–3.02 | <MRL | <MRL | <MRL | <MRL |
Never detected (21): 11Cl-PF3OUdS, 4:2 FTS, 6:2 FTS, 8:2 FTS, 9Cl-PF3ONS, ADONA, HFPO-DA, NEtFOSAA, NFDHA, NMeFOSAA, PFDA, PFDoA, PFEESA, PFHpS, 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 2026-06-16; 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.