Is There PFAS in Hornsby Bend Tap Water?
Hornsby Bend, TX: PFHxS 4.2 ng/L detected, below EPA's 10 ng/L limit, in 2024 testing. Every PFAS result and filter certifications per compound.
5 of 29 PFAS detected
Each result is read against its own reference. Only PFHxS has a federal limit. PFBA and PFPeA have no federal or state limit and are shown for transparency, not graded.
- PFHxSFederal MCLPerfluorohexanesulfonic acid4.2ng/LDetected, below its limit · limit under EPA review · sampled 2025-06-23 to 2025-12-16Evidence
- PFBSEPA health advisoryPerfluorobutanesulfonic acid5.9ng/LDetected, below its EPA health advisory · sampled 2025-06-23 to 2025-12-16Evidence
- PFHxAState MCL · MichiganPerfluorohexanoic acid3.7ng/LDetected, below its state limit · sampled 2025-06-23 to 2025-12-16Evidence
- PFPeANo limitPerfluoropentanoic acid12ng/L
No federal or state limit: shown for transparency, not graded.
Detected, no limit · sampled 2025-06-23 to 2025-12-16Evidence - PFBANo limitPerfluorobutanoic acid5ng/L
No federal or state limit: shown for transparency, not graded.
Detected, no limit · sampled 2025-06-23 to 2025-12-16Evidence
- PFOAMCLNot detected
- PFOSMCLNot detected
- PFHxSMCL4.2 ng/L
- PFNAMCLNot detected
- HFPO-DA (GenX)MCLNot detected
- PFBS5.9 ng/L
- PFHxA3.7 ng/L
- PFBA5 ng/L
- PFPeA12 ng/L
- 11Cl-PF3OUdSNot detected
- 4:2 FTSNot detected
- 6:2 FTSNot detected
- 8:2 FTSNot detected
- 9Cl-PF3ONSNot detected
- ADONANot detected
- NEtFOSAANot detected
- NFDHANot detected
- NMeFOSAANot detected
- PFDANot detected
- PFDoANot detected
- PFEESANot detected
- PFHpANot detected
- PFHpSNot detected
- PFMBANot detected
- PFMPANot detected
- PFPeSNot detected
- PFTANot detected
- PFTrDANot detected
- PFUnANot detected
MCL marks the 5 PFAS given a federal limit in EPA's 2024 rule. EPA has proposed rescinding three of those limits; they apply until a final rule.
Results as a table29 results with limit, status, sample date and source
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorohexanesulfonic acid (PFHxS) | 4.2 ng/L | 10 ng/L federal MCL (2024) | Within a historical reference; current applicability unverified | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| Perfluorobutanesulfonic acid (PFBS) | 5.9 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Within the referenced health-based guidance value | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| Perfluorohexanoic acid (PFHxA) | 3.7 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| Perfluorobutanoic acid (PFBA) | 5 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| Perfluoropentanoic acid (PFPeA) | 12 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-06-23 to 2025-12-16 | UCMR5 Analytical Results: AUSTINS COLONY (TX2270255) |
PFOS across 764 cities with a detected value
3,396 more were below the lab's 4 ng/L reporting limit and aren't plotted, and 34 have no result on record. 66 cities above 25 ng/L are grouped in the last bar. A position here is not a verdict on the water.
- AUSTINS COLONY's water system as a whole, as reported to EPA UCMR 5.
- 29 PFAS compounds, each with its own result.
- Samples taken 2025-06-23 to 2025-12-16.
- The water at your tap. Building plumbing isn't in this record.
- PFAS not listed in the 29 above were not reported in these records.
- Levels since the last sample have not been published.
Test first, then match a certified method.
A tap test can confirm levels at your home before you choose treatment.
- PFBS · detected below the limit
- PFHxA · detected below the limit
- PFHxS · detected below the limit
- PFBA · detected, no federal or state limit
- PFPeA · detected, no federal or state limit
- Reverse osmosisOpen the method →
- Activated carbon (GAC)Open the method →
- Anion exchangeOpen the method →
PFAS filters
As an Amazon Associate, PurityMap earns from qualifying purchases. A product appears here only when a current certification record covers at least one identified concern; every concern stays listed. The retail offer is looked up afterwards and never changes which products appear or their order. Affiliate disclosure.
- Browse, not a match:
- Clearly Filtered Pitcher (lab-tested, not NSF 53 certified)
Frequently asked
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Is there PFAS in Hornsby Bend tap water?
In EPA's UCMR 5 testing of AUSTINS COLONY (2025-06-23 to 2025-12-16): PFBA 5 ng/L (no federal or state limit), PFBS 5.9 ng/L (EPA health advisory 2,000), PFHxA 3.7 ng/L (state limit 400,000), PFHxS 4.2 ng/L (limit 10), PFPeA 12 ng/L (no federal or state limit) and the other 24 PFAS tested not detected. "Not detected" means below the lab's reporting limit, not proven zero.
What are the federal PFAS limits?
EPA's 2024 drinking-water rule set maximum contaminant levels of 4.0 ng/L for PFOA and for PFOS, and 10 ng/L for PFHxS, PFNA and HFPO-DA (GenX). In May 2026 EPA proposed keeping the PFOA and PFOS limits, with the option of until 2031 to comply, and rescinding the other three. Until a final rule, all five limits apply. Results above them today are above the limits in force.
How do I remove PFAS from my tap water?
Reverse-osmosis systems and filters certified to NSF/ANSI 53 or 58 for PFOA/PFOS reduction are the proven options at the tap. Check the certifier's listing (NSF, WQA or IAPMO) for the exact model, and replace cartridges on schedule.
- UCMR5 Analytical ResultsUCMR5 Analytical Results: AUSTINS COLONY (TX2270255)US EPA · 2026-01-15View source ↗
- State SDWIS Compliance RecordLead & Copper Rule 90th-percentile: AUSTINS COLONY (TX2270255)US EPA SDWIS · 2026-07-09View source ↗