No open health-based violations on EPA record in the last 10 years.
Serves about 5,418 people (1,806 connections) with groundwater from its own wells, and buys water from Harris County MUD 109 and Harris County MUD 106.
From EPA's record for TX1010903. PurityMap is independent of Harris County MUD 46.
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1 health-based violation in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From October 2024 | Lead and copper rule revisions | – | – | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from May 2024 to November 2024.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 15.8 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 | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| 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 | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| 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 | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| 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 | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| 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 | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| 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 | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| 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 | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-06 to 2024-11-04 | UCMR5 Analytical Results: HARRIS COUNTY MUD 46 (TX1010903) |
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 46's phone number on EPA record is 713-651-0111. Its mailing address is 9 GREENWAY PLZ STE 1000, HOUSTON, TX 77046-0900.
According to EPA's record, Harris County MUD 46 uses groundwater from its own wells, and buys water from Harris County MUD 109 and Harris County MUD 106.
EPA's record shows 1 health-based violation for Harris County MUD 46 in the 10 years to July 9, 2026. No open health-based violations on EPA record in the last 10 years. EPA also lists 4 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Harris County MUD 46's latest lead and copper round, which ended in December 2023, was 0.5 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Harris County MUD 46. Its phone number on EPA record is 713-651-0111. Its mailing address on EPA record is 9 GREENWAY PLZ STE 1000, HOUSTON, TX 77046-0900. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.