No health-based violations on EPA record since 2016.
Serves about 14,925 people (4,975 connections) with surface water bought from Harris County MUD 165, Harris County MUD 167, Harris County MUD 157 and 1 more.
From EPA's record for TX1011227. PurityMap is independent of Harris County MUD 105.
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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 May 2025 to November 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 45.5 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 | 2025-05-15 to 2025-11-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| Perfluorohexanoic acid (PFHxA) | 3.8 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| Perfluorobutanoic acid (PFBA) | 5.8 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| Perfluoropentanoic acid (PFPeA) | 4.1 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| 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 | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| 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 | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| 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 | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| 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 | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| 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 | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| 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 | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-15 | UCMR5 Analytical Results: HARRIS COUNTY MUD 105 (TX1011227) |
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 105'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 105 uses surface water bought from Harris County MUD 165, Harris County MUD 167, Harris County MUD 157 and 1 more.
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 105's latest lead and copper round, which ended in December 2024, was 1.58 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Harris County MUD 105. 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.