- PWSID
- TX2360001
- State
- Texas
- System type
- community water system (CWS)
- Population served
- 48,522
- City
- Huntsville
- Counties
- Walker County
- Primary source water
- surface water (purchased)
- UCMR 5 sampling
- 2023-05-16 to 2024-03-11 · 4 entry point(s) · water types: GW;SW
- Service-area boundary
- authoritative
PFOS 1–3 × its limit highest single result
PFOS 1–3 × 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
- Tra Huntsville Regional Water Supply (TX2360058)
Seller not monitored under UCMR 5.
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) | 6 | 2.52 | 4 |
| PFOS (ppt) | 8.9 | 7.1 | 4 |
| Hazard Index | 0.833 | 0.677 | 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 2023-05-16 to 2024-03-11 · 4 entry point(s) · water types: GW;SW · 14 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2023-05-16 | Lower Pressure Plane Pump Station (GW) | SE1 | <4 | <4 | 0 | lithium 14.1 µg/L |
| 2023-05-16 | Palm St. Demand Wells (GW) | SE1 | <4 | 6.7 | 0.552 | PFBA 8.7, PFHpA 3.4, PFHxA 8.4, PFPeA 6.8, lithium 52.5 µg/L |
| 2023-05-16 | Spring Lake (GW) | SE1 | <4 | <4 | 0 | lithium 59.9 µg/L |
| 2023-05-16 | Tra Huntsville Water Intertie (SW) | SE1 | <4 | <4 | 0 | PFBA 6.8, lithium 60.2 µg/L |
| 2023-08-07 | Tra Huntsville Water Intertie (SW) | SE2 | n/a | n/a | n/a | lithium 10 µg/L |
| 2023-10-23 | Tra Huntsville Water Intertie (SW) | SE2 | 6 | 8.9 | 0.715 | PFBA 12.9, PFHpA 6.7, PFHxA 17.9, PFPeA 19.4 |
| 2023-11-27 | Lower Pressure Plane Pump Station (GW) | SE2 | n/a | n/a | n/a | none |
| 2023-11-27 | Palm St. Demand Wells (GW) | SE2 | n/a | n/a | n/a | none |
| 2023-11-27 | Spring Lake (GW) | SE2 | <4 | <4 | 0 | lithium 55.3 µg/L |
| 2023-11-27 | Tra Huntsville Water Intertie (SW) | SE3 | n/a | n/a | n/a | none |
| 2024-02-07 | Tra Huntsville Water Intertie (SW) | SE4 | <4 | 5.7 | 0.322 | PFHxA 4.1, PFPeA 4.1 |
| 2024-03-11 | Lower Pressure Plane Pump Station (GW) | SE2 | <4 | 7.4 | 0.833 | PFBA 8.2, PFHpA 3.6, PFHxA 9.7, PFPeA 11 |
| 2024-03-11 | Palm St. Demand Wells (GW) | SE2 | <4 | 7.5 | 0.803 | PFBA 7.6, PFHpA 3.6, PFHxA 10, PFPeA 11.6 |
| 2024-03-11 | Tra Huntsville Water Intertie (SW) | SE3 | 4.1 | 7.7 | 0.813 | PFBA 8.5, PFHpA 3.8, PFHxA 10, PFPeA 12.4 |
“<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
300 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.
Lower Pressure Plane Pump Station facility PBCU004 · sample point EP004MC · groundwater
| Compound | MRL | 2023-05-16 SE1 | 2023-11-27 SE2 | 2024-03-11 SE2 |
|---|---|---|---|---|
| PFBA | 5 ppt | < 5 | – | 8.2 |
| PFBS | 3 ppt | < 3 | – | 5.7 |
| PFHpA | 3 ppt | < 3 | – | 3.6 |
| PFHxA | 3 ppt | < 3 | – | 9.7 |
| PFHxS | 3 ppt | < 3 | – | 8.3 |
| PFOS | 4 ppt | < 4 | – | 7.4 |
| PFPeA | 3 ppt | < 3 | – | 11 |
| 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 | – |
| PFDA | 3 ppt | < 3 | – | < 3 |
| PFDoA | 3 ppt | < 3 | – | < 3 |
| PFEESA | 3 ppt | < 3 | – | < 3 |
| PFHpS | 3 ppt | < 3 | – | < 3 |
| PFMBA | 3 ppt | < 3 | – | < 3 |
| PFMPA | 4 ppt | < 4 | – | < 4 |
| PFNA | 4 ppt | < 4 | – | < 4 |
| PFOA | 4 ppt | < 4 | – | < 4 |
| PFPeS | 4 ppt | < 4 | – | < 4 |
| PFTA | 8 ppt | < 8 | < 8 | – |
| PFTrDA | 7 ppt | < 7 | < 7 | – |
| PFUnA | 2 ppt | < 2 | – | < 2 |
| lithium | 9 µg/L | 14.1 | < 9 | – |
Palm St. Demand Wells facility 59226 · sample point EP001MC · groundwater
| Compound | MRL | 2023-05-16 SE1 | 2023-11-27 SE2 | 2024-03-11 SE2 |
|---|---|---|---|---|
| PFBA | 5 ppt | 8.7 | – | 7.6 |
| PFBS | 3 ppt | 3.9 | – | 5.6 |
| PFHpA | 3 ppt | 3.4 | – | 3.6 |
| PFHxA | 3 ppt | 8.4 | – | 10 |
| PFHxS | 3 ppt | 5.5 | – | 8 |
| PFOS | 4 ppt | 6.7 | – | 7.5 |
| PFPeA | 3 ppt | 6.8 | – | 11.6 |
| 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 | – |
| PFDA | 3 ppt | < 3 | – | < 3 |
| PFDoA | 3 ppt | < 3 | – | < 3 |
| PFEESA | 3 ppt | < 3 | – | < 3 |
| PFHpS | 3 ppt | < 3 | – | < 3 |
| PFMBA | 3 ppt | < 3 | – | < 3 |
| PFMPA | 4 ppt | < 4 | – | < 4 |
| PFNA | 4 ppt | < 4 | – | < 4 |
| PFOA | 4 ppt | < 4 | – | < 4 |
| PFPeS | 4 ppt | < 4 | – | < 4 |
| PFTA | 8 ppt | < 8 | < 8 | – |
| PFTrDA | 7 ppt | < 7 | < 7 | – |
| PFUnA | 2 ppt | < 2 | – | < 2 |
| lithium | 9 µg/L | 52.5 | < 9 | – |
Spring Lake facility 59227 · sample point EP002MC · groundwater
| Compound | MRL | 2023-05-16 SE1 | 2023-11-27 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 | 59.9 | 55.3 |
Tra Huntsville Water Intertie facility 36016 · sample point EP001 · surface water
| Compound | MRL | 2023-05-16 SE1 | 2023-08-07 SE2 | 2023-10-23 SE2 | 2023-11-27 SE3 | 2024-02-07 SE4 | 2024-03-11 SE3 |
|---|---|---|---|---|---|---|---|
| PFBA | 5 ppt | 6.8 | – | 12.9 | – | < 5 | 8.5 |
| PFBS | 3 ppt | < 3 | – | 9.5 | – | 3 | 5.9 |
| PFHpA | 3 ppt | < 3 | – | 6.7 | – | < 3 | 3.8 |
| PFHxA | 3 ppt | < 3 | – | 17.9 | – | 4.1 | 10 |
| PFHxS | 3 ppt | < 3 | – | 7.1 | – | 3.2 | 8.1 |
| PFOA | 4 ppt | < 4 | – | 6 | – | < 4 | 4.1 |
| PFOS | 4 ppt | < 4 | – | 8.9 | – | 5.7 | 7.7 |
| PFPeA | 3 ppt | < 3 | – | 19.4 | – | 4.1 | 12.4 |
| 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 |
| 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 | 60.2 | 10 | – | < 9 | < 9 | – |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| PFBA | 10 | 60% | 12.9 2023-10-23 | 5.27–7.27 | 6.8 | 8.5 | 8.7 | 12.9 |
| PFBS | 10 | 60% | 9.5 2023-10-23 | 3.36–4.56 | 3 | 5.7 | 5.9 | 9.5 |
| PFHxA | 10 | 60% | 17.9 2023-10-23 | 6.01–7.21 | 4.1 | 10 | 10 | 17.9 |
| PFHxS | 10 | 60% | 8.3 2024-03-11 | 4.02–5.22 | 3.2 | 8 | 8.1 | 8.3 |
| PFOS | 10 | 60% | 8.9 2023-10-23 | 4.39–5.99 | 5.7 | 7.5 | 7.7 | 8.9 |
| PFPeA | 10 | 60% | 19.4 2023-10-23 | 6.53–7.73 | 4.1 | 11.6 | 12.4 | 19.4 |
| lithium | 10 | 60% | 60.2 2023-05-16 | 25.2–28.8 | 10 | 55.3 | 59.9 | 60.2 |
| PFHpA | 10 | 50% | 6.7 2023-10-23 | 2.11–3.61 | <MRL | 3.6 | 3.8 | 6.7 |
| PFOA | 10 | 20% | 6 2023-10-23 | 1.01–4.21 | <MRL | <MRL | 4.1 | 6 |
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.