No open health-based violations on EPA record in the last 10 years; latest legal-limit breach in the period starting July 2019.
Serves about 5,082 people (1,694 connections) with groundwater from its own wells.
From EPA's record for TX2500039. PurityMap is independent of Lake Fork WSC.
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3 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Jul–Sep 2019 | Total trihalomethanes (TTHM) | 0.095 mg/L | 0.080 mg/L | Resolved |
| Apr–Jun 2019 | Total trihalomethanes (TTHM) | 0.104 mg/L | 0.080 mg/L | Resolved |
| Jan–Mar 2019 | Total trihalomethanes (TTHM) | 0.101 mg/L | 0.080 mg/L | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from January 2023 to September 2023.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 16.8 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 | 2023-01-25 to 2023-07-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| 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 | 2023-06-27 to 2023-07-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| 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 | 2023-06-27 to 2023-07-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| 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 | 2023-06-27 to 2023-07-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| 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 | 2023-06-27 to 2023-07-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-27 to 2023-07-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| 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 | 2023-06-27 to 2023-07-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-27 to 2023-07-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-15 to 2023-09-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-15 to 2023-09-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-27 to 2023-07-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-27 to 2023-07-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-27 to 2023-07-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-27 to 2023-07-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| 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 | 2023-06-27 to 2023-07-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-27 to 2023-07-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-27 to 2023-07-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-27 to 2023-07-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-27 to 2023-07-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-27 to 2023-07-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-27 to 2023-07-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-06-27 to 2023-07-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-27 to 2023-07-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-27 to 2023-07-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-27 to 2023-07-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-27 to 2023-07-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-27 to 2023-07-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-15 to 2023-09-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-15 to 2023-09-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-27 to 2023-07-25 | UCMR5 Analytical Results: LAKE FORK WSC (TX2500039) |
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 →Lake Fork WSC's phone number on EPA record is 903-383-7643. Its mailing address is PO BOX 275, YANTIS, TX 75497-0275.
According to EPA's record, Lake Fork WSC uses groundwater from its own wells.
EPA's record shows 3 health-based violations for Lake Fork WSC in the 10 years to July 9, 2026. No open health-based violations on EPA record in the last 10 years. The latest legal-limit breach on record was in the period starting July 2019. EPA also lists 9 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 Lake Fork WSC's latest lead and copper round, which ended in December 2024. The federal action level is 15 µg/L.
PurityMap has no verified website for Lake Fork WSC. Its phone number on EPA record is 903-383-7643. Its mailing address on EPA record is PO BOX 275, YANTIS, TX 75497-0275. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.