Total trihalomethanes (TTHM) above the legal limit in the period starting April 2026; 1 open health-based violation on EPA record.
Serves about 5,207 people (1,988 connections) with groundwater from its own wells, and buys water from City of Lufkin.
From EPA's record for TX0030001. PurityMap is independent of City of Diboll.
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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 |
|---|---|---|---|---|
| Apr–Jun 2026 | Total trihalomethanes (TTHM) | 0.099 mg/L | 0.080 mg/L | Unaddressed |
| Jan–Mar 2026 | Total trihalomethanes (TTHM) | 0.093 mg/L | 0.080 mg/L | Archived |
| Oct–Dec 2025 | Total trihalomethanes (TTHM) | 0.088 mg/L | 0.080 mg/L | Archived |
| From October 2024 | Lead and copper rule revisions | – | – | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from January 2025 to July 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 48.9 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 | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| 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 | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| 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 | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| 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 | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| 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 | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| 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 | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| 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 | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-08 to 2025-07-08 | UCMR5 Analytical Results: CITY OF DIBOLL (TX0030001) |
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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 →City of Diboll's phone number on EPA record is 936-829-4757. Its mailing address is PO BOX 340, DIBOLL, TX 75941-0340.
According to EPA's record, City of Diboll uses groundwater from its own wells, and buys water from City of Lufkin.
EPA's record shows 4 health-based violations for City of Diboll in the 10 years to July 9, 2026. Total trihalomethanes (TTHM) were above the legal limit in the period starting April 2026. EPA's record also shows 1 open health-based violation. 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 City of Diboll'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 City of Diboll. Its phone number on EPA record is 936-829-4757. Its mailing address on EPA record is PO BOX 340, DIBOLL, TX 75941-0340. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.