No health-based violations on EPA record since 2016.
Serves about 4,854 people (1,618 connections) with surface water bought from Harris County WCID 110 and North Harris County Regional Water Autho.
From EPA's record for TX1011534. PurityMap is independent of Harris County MUD 104.
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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 February 2024 to November 2024.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 12.8 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 | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| Perfluorobutanoic acid (PFBA) | 6.1 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| Perfluoropentanoic acid (PFPeA) | 4.4 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| 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 | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| 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 | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| 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 | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| 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 | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| 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 | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| 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 | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-09 to 2024-11-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 104 (TX1011534) |
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 104'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 104 uses surface water bought from Harris County WCID 110 and North Harris County Regional Water Autho.
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 104's latest lead and copper round, which ended in December 2025, was 10.9 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Harris County MUD 104. 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.