LCRA Environmental Laboratory Services
A NELAP laboratory providing quality testing to safeguard public health and ensure regulatory compliance.
Per- and Polyfluoroalkyl Substances (PFAS)
We are accredited by TCEQ to analyze EPA-regulated PFAS analytes in drinking water.
ELS offers PFAS testing on drinking water, surface water, groundwater and wastewater samples.
TCEQ-accredited methods
- EPA 533
- EPA 537.1
See the list of contaminants, minimum reporting levels and methods.
National Primary Drinking Water Regulations (NPDWR) Per- and Polyfluoroalkyl Substances
| Contaminant | Chemical Abstract Service Registry Number (CASRN) | Minimum Reporting Level | Analytical Methods |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | 763051-92-9 | 0.005 µg/L | EPA Method 533 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (9Cl-PF3ONS) | 756426-58-1 | 0.002 µg/L | EPA Method 533 |
| 4,8-dioxa-3H-perfluorononanoic acid (ADONA) | 919005-14-4 | 0.003 µg/L | EPA Method 533 |
| hexafluoropropylene oxide dimer acid (HFPO DA) | 13252-13-6 | 0.005 µg/L | EPA Method 533 |
| nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | 151772-58-6 | 0.02 µg/L | EPA Method 533 |
| perfluorobutanoic acid (PFBA) | 375-22-4 | 0.005 µg/L | EPA Method 533 |
| perfluorobutanesulfonic acid (PFBS) | 375-73-5 | 0.003 µg/L | EPA Method 533 |
| 1H,1H, 2H, 2H-perfluorodecane sulfonic acid (8:2FTS) | 39108-34-4 | 0.005 µg/L | EPA Method 533 |
| perfluorodecanoic acid (PFDA) | 335-76-2 | 0.003 µg/L | EPA Method 533 |
| perfluorododecanoic acid (PFDoA) | 307-55-1 | 0.003 µg/L | EPA Method 533 |
| perfluoro(2-ethoxyethane)sulfonic acid (PFEESA) | 113507-82-7 | 0.003 µg/L | EPA Method 533 |
| perfluoroheptanesulfonic acid (PFHpS) | 375-92-8 | 0.003 µg/L | EPA Method 533 |
| perfluoroheptanoic acid (PFHpA) | 375-85-9 | 0.003 µg/L | EPA Method 533 |
| 1H,1H, 2H, 2H-perfluorohexane sulfonic acid (4:2FTS) | 757124-72-4 | 0.003 µg/L | EPA Method 533 |
| perfluorohexanesulfonic acid (PFHxS) | 355-46-4 | 0.003 µg/L | EPA Method 533 |
| perfluorohexanoic acid (PFHxA) | 307-24-4 | 0.003 µg/L | EPA Method 533 |
| perfluoro-3-methoxypropanoic acid (PFMPA) | 377-73-1 | 0.004 µg/L | EPA Method 533 |
| perfluoro-4-methoxybutanoic acid (PFMBA) | 863090-89-5 | 0.003 µg/L | EPA Method 533 |
| perfluorononanoic acid (PFNA) | 375-95-1 | 0.004 µg/L | EPA Method 533 |
| 1H,1H, 2H, 2H-perfluorooctane sulfonic acid (6:2FTS) | 27619-97-2 | 0.005 µg/L | EPA Method 533 |
| perfluorooctanesulfonic acid (PFOS) | 1763-23-1 | 0.004 µg/L | EPA Method 533 |
| perfluorooctanoic acid (PFOA) | 335-67-1 | 0.004 µg/L | EPA Method 533 |
| perfluoropentanoic acid (PFPeA) | 2706-90-3 | 0.003 µg/L | EPA Method 533 |
| perfluoropentanesulfonic acid (PFPeS) | 2706-91-4 | 0.004 µg/L | EPA Method 533 |
| perfluoroundecanoic acid (PFUnA) | 2058-94-8 | 0.002 µg/L | EPA Method 533 |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | 2991-50-6 | 0.005 µg/L | EPA Method 537.1 |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | 2355-31-9 | 0.006 µg/L | EPA Method 537.1 |
| perfluorotetradecanoic acid (PFTA) | 376-06-7 | 0.008 µg/L | EPA Method 537.1 |
| perfluorotridecanoic acid (PFTrDA) | 72629-94-8 | 0.007 µg/L | EPA Method 537.1 |
*Included in the EPA’s final NPDWR.
TCEQ PFAS Initial Monitoring
In April 2024, the EPA announced the final National Primary Drinking Water Regulation (NPDWR) that established legally enforceable levels, called Maximum Contaminant Levels (MCLs), for two PFAS in drinking water. Under the final rule, public water systems must monitor these substances. If monitoring shows that drinking water levels exceed the MCLs, the public water systems must implement solutions that reduce the PFAS.
TCEQ is requiring public water systems complete initial PFAS monitoring to establish compliance schedules by April 26, 2027. The PFAS rule excludes purchase water systems.
Initial monitoring requirements
For groundwater community and non-transient, non-community systems with populations greater than 10,000 and all systems using surface water and groundwater under the influence of surface water:
- One sample per entry point, per quarter, collected every two to four months, for four quarters. Quarters do not have to be consecutive.
For public water systems with populations less than or equal to 10,000, contact TCEQ at [email protected] for more information on initial monitoring.
If a public water system participated in UCMR 5, the data may possibly be used for initial monitoring requirements but would need to be reprocessed to meet the lower MCL requirements.
Additional sampling may be needed for UCMR 5 participants if:
- Sampling events did not represent each calendar quarter, spaced two to four months apart.
- New or existing entry point(s) were not included in UCMR 5.
- Groundwater entry points only had two sampling events occur during UCMR 5.
Meet TCEQ initial monitoring requirements
- Request a quote or order bottle kit.
- Sign and return quote to LCRA ELS.
- LCRA ELS will ship bottle kits or schedule sampling events and analyze samples.
- LCRA ELS will deliver the final report through the Client Data Portal.
Hours and Contact Info
8 a.m. to 5 p.m.
Monday through Friday
Holiday closure schedule
3505 Montopolis Drive, Austin, TX 78744
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