- PWSID
- TX2270161
- State
- Texas
- System type
- community water system (CWS)
- Population served
- 21,231
- City
- Austin
- Counties
- Travis County
- Primary source water
- surface water (purchased)
- UCMR 5 sampling
- 2024-09-26 to 2025-05-19 · 6 entry point(s) · water types: GW
- 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
- City Of Austin Water & Wastewater (TX2270001)
Seller's highest results: PFOA <MRL · PFOS 4.8 ppt · HI 0.623 · detected: PFBA;PFBS;PFHxA;PFHxS;PFOS;PFPeA - City Of Pflugerville (TX2270014)
Seller's highest results: PFOA 6.3 ppt · PFOS 14.4 ppt · HI 3.195 · detected: PFBA;PFBS;PFHpA;PFHxA;PFHxS;PFNA;PFOA;PFOS;PFPeA;PFUnA
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) | 7.5 | 7.35 | 4 |
| Hazard Index | 0.655 | 0.634 | 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 2024-09-26 to 2025-05-19 · 6 entry point(s) · water types: GW · 16 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2024-09-26 | Heatherwilde Treatment Plant (GW) | SE1 | n/a | n/a | n/a | lithium 21.3 µg/L |
| 2024-09-26 | Well 1 (GW) | SE1 | n/a | n/a | n/a | lithium 10.9 µg/L |
| 2024-09-26 | Well 10 (GW) | SE1 | <4 | <4 | 0 | lithium 33.7 µg/L |
| 2024-09-26 | Well 5 (GW) | SE1 | n/a | n/a | n/a | none |
| 2024-09-26 | Well 7 (GW) | SE1 | n/a | n/a | n/a | lithium 31.5 µg/L |
| 2024-10-03 | Well 8 (GW) | SE1 | <4 | 7.2 | 0.644 | PFHxA 3.3, PFPeA 4.1 |
| 2025-01-07 | Well 1 (GW) | SE1 | <4 | <4 | 0.503 | PFBA 5, PFPeA 3.4 |
| 2025-04-03 | Well 1 (GW) | SE2 | <4 | 4 | 0.534 | PFPeA 4.4, lithium 9.5 µg/L |
| 2025-04-03 | Well 10 (GW) | SE2 | <4 | <4 | 0 | lithium 30.9 µg/L |
| 2025-04-03 | Well 5 (GW) | SE2 | <4 | 7.2 | 0.655 | PFBA 5.7, PFHxA 3.4, PFPeA 5 |
| 2025-04-03 | Well 7 (GW) | SE2 | <4 | 4.1 | 0.432 | PFPeA 3, lithium 25.9 µg/L |
| 2025-04-03 | Well 8 (GW) | SE2 | <4 | 7.5 | 0.604 | PFBA 5.1, PFHxA 3.6, PFPeA 4.9 |
| 2025-05-19 | Well 1 (GW) | SE2 | n/a | n/a | n/a | none |
| 2025-05-19 | Well 5 (GW) | SE1 | <4 | 7 | 0.614 | PFBA 5.3, PFHxA 3.9, PFPeA 5.9 |
| 2025-05-19 | Well 7 (GW) | SE1 | <4 | <4 | 0.402 | PFPeA 3.2 |
| 2025-05-19 | Well 8 (GW) | SE2 | 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
305 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.
Heatherwilde Treatment Plant facility 10001 · sample point EP007 · groundwater
| Compound | MRL | 2024-09-26 SE1 |
|---|---|---|
| NEtFOSAA | 5 ppt | < 5 |
| NMeFOSAA | 6 ppt | < 6 |
| PFTA | 8 ppt | < 8 |
| PFTrDA | 7 ppt | < 7 |
| lithium | 9 µg/L | 21.3 |
Well 1 facility 58774 · sample point EP001MC1 · groundwater
| Compound | MRL | 2024-09-26 SE1 | 2025-01-07 SE1 | 2025-04-03 SE2 | 2025-05-19 SE2 |
|---|---|---|---|---|---|
| PFBA | 5 ppt | – | 5 | < 5 | – |
| PFBS | 3 ppt | – | 6.5 | 7.4 | – |
| PFHxS | 3 ppt | – | 5 | 5.3 | – |
| PFOS | 4 ppt | – | < 4 | 4 | – |
| PFPeA | 3 ppt | – | 3.4 | 4.4 | – |
| 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 | – |
| PFHpA | 3 ppt | – | < 3 | < 3 | – |
| PFHpS | 3 ppt | – | < 3 | < 3 | – |
| PFHxA | 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 | 10.9 | – | 9.5 | – |
Well 10 facility 62025 · sample point EP008MC6 · groundwater
| Compound | MRL | 2024-09-26 SE1 | 2025-04-03 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 | 33.7 | 30.9 |
Well 5 facility 58775 · sample point EP003MC3 · groundwater
| Compound | MRL | 2024-09-26 SE1 | 2025-04-03 SE2 | 2025-05-19 SE1 |
|---|---|---|---|---|
| PFBA | 5 ppt | – | 5.7 | 5.3 |
| PFBS | 3 ppt | – | 9.2 | 8.1 |
| PFHxA | 3 ppt | – | 3.4 | 3.9 |
| PFHxS | 3 ppt | – | 6.5 | 6.1 |
| PFOS | 4 ppt | – | 7.2 | 7 |
| PFPeA | 3 ppt | – | 5 | 5.9 |
| 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 |
| PFHpA | 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 | < 9 | < 9 | – |
Well 7 facility 58778 · sample point EP006MC4 · groundwater
| Compound | MRL | 2024-09-26 SE1 | 2025-04-03 SE2 | 2025-05-19 SE1 |
|---|---|---|---|---|
| PFBS | 3 ppt | – | 4.8 | 4.1 |
| PFHxS | 3 ppt | – | 4.3 | 4 |
| PFOS | 4 ppt | – | 4.1 | < 4 |
| PFPeA | 3 ppt | – | 3 | 3.2 |
| 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 |
| 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 |
| 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 | 31.5 | 25.9 | – |
Well 8 facility 58780 · sample point EP005 · groundwater
| Compound | MRL | 2024-10-03 SE1 | 2025-04-03 SE2 | 2025-05-19 SE2 |
|---|---|---|---|---|
| PFBA | 5 ppt | < 5 | 5.1 | – |
| PFBS | 3 ppt | 8.8 | 8.1 | – |
| PFHxA | 3 ppt | 3.3 | 3.6 | – |
| PFHxS | 3 ppt | 6.4 | 6 | – |
| PFOS | 4 ppt | 7.2 | 7.5 | – |
| PFPeA | 3 ppt | 4.1 | 4.9 | – |
| 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 | – |
| PFHpA | 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 | < 9 | < 9 | – |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| PFBS | 10 | 80% | 9.2 2025-04-03 | 5.7–6.3 | 6.5 | 8.1 | 8.8 | 9.2 |
| PFHxS | 10 | 80% | 6.5 2025-04-03 | 4.36–4.96 | 5 | 6.1 | 6.4 | 6.5 |
| PFPeA | 10 | 80% | 5.9 2025-05-19 | 3.39–3.99 | 3.4 | 4.9 | 5 | 5.9 |
| lithium | 11 | 64% | 33.7 2024-09-26 | 14.88–18.15 | 10.9 | 30.9 | 31.5 | 33.7 |
| PFOS | 10 | 60% | 7.5 2025-04-03 | 3.7–5.3 | 4 | 7.2 | 7.2 | 7.5 |
| PFBA | 10 | 40% | 5.7 2025-04-03 | 2.11–5.11 | <MRL | 5.1 | 5.3 | 5.7 |
| PFHxA | 10 | 40% | 3.9 2025-05-19 | 1.42–3.22 | <MRL | 3.4 | 3.6 | 3.9 |
Never detected (23): 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, 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.