No health-based violations on EPA record since 2016.
Serves about 10,584 people (3,528 connections) with surface water bought from City of Houston and Trail of the Lakes MUD.
From EPA's record for TX1012835. PurityMap is independent of Harris County MUD 278.
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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 March 2024 to March 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 21 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 | 2024-03-11 to 2024-12-11 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| Perfluorohexanoic acid (PFHxA) | 4.2 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2024-04-10 to 2025-01-08 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| Perfluorobutanoic acid (PFBA) | 6 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2024-04-10 to 2025-01-08 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| Perfluoropentanoic acid (PFPeA) | 5.8 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2024-04-10 to 2025-01-08 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| 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 | 2024-04-10 to 2025-01-08 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| 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 | 2024-04-10 to 2025-01-08 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| 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 | 2024-04-10 to 2025-01-08 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| 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 | 2024-04-10 to 2025-01-08 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-10 to 2025-01-08 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| 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 | 2024-04-10 to 2025-01-08 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-04-10 to 2025-01-08 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-10 to 2025-03-26 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-10 to 2025-03-26 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-10 to 2025-01-08 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-10 to 2025-01-08 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-10 to 2025-01-08 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-10 to 2025-01-08 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| 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 | 2024-04-10 to 2025-01-08 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-10 to 2025-01-08 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-10 to 2025-01-08 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-10 to 2025-01-08 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-10 to 2025-01-08 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-04-10 to 2025-01-08 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-04-10 to 2025-01-08 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-04-10 to 2025-01-08 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-04-10 to 2025-01-08 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-10 to 2025-01-08 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-10 to 2025-03-26 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-10 to 2025-03-26 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-10 to 2025-01-08 | UCMR5 Analytical Results: HARRIS COUNTY MUD 278 (TX1012835) |
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 →Harris County MUD 278's phone number on EPA record is 713-860-6400. Its mailing address is 3200 SOUTHWEST FWY STE 2600, HOUSTON, TX 77027-7537.
According to EPA's record, Harris County MUD 278 uses surface water bought from City of Houston and Trail of the Lakes MUD.
No health-based violations on EPA record since 2016. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Harris County MUD 278's latest lead and copper round, which ended in December 2025, was 1.2 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Harris County MUD 278. Its phone number on EPA record is 713-860-6400. Its mailing address on EPA record is 3200 SOUTHWEST FWY STE 2600, HOUSTON, TX 77027-7537. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.