No health-based violations on EPA record since 2016.
Serves about 6,168 people (2,056 connections) with groundwater bought from Harris County MUD 360 and Harris County MUD 365.
From EPA's record for TX1013132. PurityMap is independent of Harris County MUD 364.
Are you this utility? Correct this listing →
No health-based violations in the last 10 years, from EPA's SDWIS compliance database.
EPA required this system to test for 26 unregulated and emerging contaminants, in October 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 37.2 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 | 2025-10-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 364 (TX1013132) |
| 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 | 2025-10-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 364 (TX1013132) |
| 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 | 2025-10-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 364 (TX1013132) |
| 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 | 2025-10-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 364 (TX1013132) |
| 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 | 2025-10-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 364 (TX1013132) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-10-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 364 (TX1013132) |
| 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 | 2025-10-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 364 (TX1013132) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-10-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 364 (TX1013132) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-10-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 364 (TX1013132) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-10-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 364 (TX1013132) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-10-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 364 (TX1013132) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-10-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 364 (TX1013132) |
| 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 | 2025-10-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 364 (TX1013132) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-10-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 364 (TX1013132) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-10-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 364 (TX1013132) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-10-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 364 (TX1013132) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-10-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 364 (TX1013132) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-10-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 364 (TX1013132) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-10-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 364 (TX1013132) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2025-10-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 364 (TX1013132) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-10-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 364 (TX1013132) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-10-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 364 (TX1013132) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-10-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 364 (TX1013132) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-10-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 364 (TX1013132) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-10-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 364 (TX1013132) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-10-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 364 (TX1013132) |
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure
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 364's phone number on EPA record is 346-440-1147. Its mailing address is 1401 ENCLAVE PKWY STE 625, HOUSTON, TX 77077-2874.
According to EPA's record, Harris County MUD 364 uses groundwater bought from Harris County MUD 360 and Harris County MUD 365.
No health-based violations on EPA record since 2016. The record comes from EPA's SDWIS compliance database.
Lead was not detected at the 90th percentile of tap samples in Harris County MUD 364's latest lead and copper round, which ended in December 2025. The federal action level is 15 µg/L.
PurityMap has no verified website for Harris County MUD 364. Its phone number on EPA record is 346-440-1147. Its mailing address on EPA record is 1401 ENCLAVE PKWY STE 625, HOUSTON, TX 77077-2874. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.