No health-based violations on EPA record since 2016.
Serves about 43,552 people (2,502 connections) with groundwater from its own wells, and buys water from City of San Marcos.
From EPA's record for TX1050003. PurityMap is independent of Texas State University.
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No health-based violations in the last 10 years, from EPA's SDWIS compliance database.
EPA required this system to test for 30 unregulated and emerging contaminants, from October 2024 to April 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 9.5 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Within the referenced health-based guidance value | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| 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 | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| 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 | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| 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 | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| 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 | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| 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 | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| Perfluorobutanesulfonic acid (PFBS) | < 3 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-17 to 2025-04-09 | UCMR5 Analytical Results: TEXAS STATE UNIVERSITY - SAN MARCOS (TX1050003) |
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
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Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
Get PurityMap updates about this water system.
Follow this water →Texas State University's phone number on EPA record is 512-245-8629. Its mailing address is 601 UNIVERSITY DR, SAN MARCOS, TX 78666-4684.
According to EPA's record, Texas State University uses groundwater from its own wells, and buys water from City of San Marcos.
No health-based violations on EPA record since 2016. EPA also lists 4 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Texas State University's latest lead and copper round, which ended in December 2023, was 1.3 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Texas State University. Its phone number on EPA record is 512-245-8629. Its mailing address on EPA record is 601 UNIVERSITY DR, SAN MARCOS, TX 78666-4684. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.