Total trihalomethanes (TTHM) above the legal limit in the period starting January 2026.
Serves about 2,223 people (1,516 connections) with surface water bought from City of Rio Grande City.
From EPA's record for TX2140028. PurityMap is independent of El Sauz WSC.
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13 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Jan–Mar 2026 | Total trihalomethanes (TTHM) | 0.081 mg/L | 0.080 mg/L | Archived |
| Jan–Mar 2024 | Total trihalomethanes (TTHM) | 0.083 mg/L | 0.080 mg/L | Resolved |
| Jul–Sep 2023 | Total trihalomethanes (TTHM) | 0.082 mg/L | 0.080 mg/L | Resolved |
| Apr–Jun 2022 | Total trihalomethanes (TTHM) | 0.095 mg/L | 0.080 mg/L | Resolved |
| Jan–Mar 2022 | Total trihalomethanes (TTHM) | 0.108 mg/L | 0.080 mg/L | Resolved |
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Oct–Dec 2021 | Total trihalomethanes (TTHM) | 0.109 mg/L | 0.080 mg/L | Resolved |
| Jul–Sep 2021 | Total trihalomethanes (TTHM) | 0.109 mg/L | 0.080 mg/L | Resolved |
| Oct–Dec 2020 | Total trihalomethanes (TTHM) | 0.081 mg/L | 0.080 mg/L | Resolved |
| Jul–Sep 2020 | Total trihalomethanes (TTHM) | 0.082 mg/L | 0.080 mg/L | Resolved |
| Apr–Jun 2020 | Total trihalomethanes (TTHM) | 0.081 mg/L | 0.080 mg/L | Resolved |
| Apr–Jun 2017 | Total trihalomethanes (TTHM) | 0.087 mg/L | 0.080 mg/L | Resolved |
| Jan–Mar 2017 | Total trihalomethanes (TTHM) | 0.088 mg/L | 0.080 mg/L | Resolved |
| Oct–Dec 2016 | Total trihalomethanes (TTHM) | 0.084 mg/L | 0.080 mg/L | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from February 2025 to October 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 49.3 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Above the referenced health-based guidance value | 2025-02-24 to 2025-10-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| 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 | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| 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 | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| 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 | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| 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 | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| 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 | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| 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 | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-24 to 2025-07-21 | UCMR5 Analytical Results: EL SAUZ WSC (TX2140028) |
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.
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Follow this water →El Sauz WSC's phone number on EPA record is 956-486-2273. Its mailing address is 545 N FM 649, ROMA, TX 78584-6283.
According to EPA's record, El Sauz WSC uses surface water bought from City of Rio Grande City.
EPA's record shows 13 health-based violations for El Sauz WSC in the 10 years to July 9, 2026. Total trihalomethanes (TTHM) were above the legal limit in the period starting January 2026. EPA also lists 24 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
Lead was not detected at the 90th percentile of tap samples in El Sauz WSC's latest lead and copper round, which ended in December 2023. The federal action level is 15 µg/L.
PurityMap has no verified website for El Sauz WSC. Its phone number on EPA record is 956-486-2273. Its mailing address on EPA record is 545 N FM 649, ROMA, TX 78584-6283. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.