No health-based violations on EPA record since 2016.
Serves about 12,342 people (4,114 connections) with groundwater from its own wells, and buys water from Harris Montgomery Counties MUD 386, Northampton MUD and Northwest Harris County MUD 19.
From EPA's record for TX1010539. PurityMap is independent of Harris County MUD 1.
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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 June 2023 to August 2024.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 36.5 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 | 2023-06-14 to 2023-12-08 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| 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 | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| 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 | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| 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 | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| 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 | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| 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 | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| 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 | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-08-02 | UCMR5 Analytical Results: HARRIS COUNTY MUD 1 (TX1010539) |
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 1's phone number on EPA record is 713-652-6500. Its mailing address is 2727 ALLEN PKWY STE 1100, HOUSTON, TX 77019-2191.
According to EPA's record, Harris County MUD 1 uses groundwater from its own wells, and buys water from Harris Montgomery Counties MUD 386, Northampton MUD and Northwest Harris County MUD 19.
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 1's latest lead and copper round, which ended in December 2024, was 2.87 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Harris County MUD 1. Its phone number on EPA record is 713-652-6500. Its mailing address on EPA record is 2727 ALLEN PKWY STE 1100, HOUSTON, TX 77019-2191. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.