No open health-based violations on EPA record in the last 10 years.
Serves about 6,009 people (2,003 connections) with surface water from its own intake, and buys water from Southmost Regional Water Authority.
From EPA's record for TX0310004. PurityMap is independent of City of Los Fresnos.
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4 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From October 2016 | Interim Enhanced Surface Water Treatment Rule | – | – | Resolved |
| From September 2016 | Interim Enhanced Surface Water Treatment Rule | – | – | Resolved |
| From August 2016 | Interim Enhanced Surface Water Treatment Rule | – | – | Resolved |
| From August 2016 | Interim Enhanced Surface Water Treatment Rule | – | – | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from January 2023 to November 2023.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 50.5 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 | 2023-01-16 to 2023-10-10 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| 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 | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| 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 | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| 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 | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| 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 | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| 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 | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| 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 | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-16 to 2023-11-06 | UCMR5 Analytical Results: CITY OF LOS FRESNOS (TX0310004) |
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 →City of Los Fresnos's phone number on EPA record is 956-233-5768. Its mailing address is 520 E OCEAN BLVD, LOS FRESNOS, TX 78566-3246.
According to EPA's record, City of Los Fresnos uses surface water from its own intake, and buys water from Southmost Regional Water Authority.
EPA's record shows 4 health-based violations for City of Los Fresnos in the 10 years to July 9, 2026. No open health-based violations on EPA record in the last 10 years. EPA also lists 7 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in City of Los Fresnos's latest lead and copper round, which ended in December 2023, was 1.76 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for City of Los Fresnos. Its phone number on EPA record is 956-233-5768. Its mailing address on EPA record is 520 E OCEAN BLVD, LOS FRESNOS, TX 78566-3246. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.