No health-based violations on EPA record since 2016.
Serves about 3,645 people (1,215 connections) with groundwater from its own wells, and buys water from Fallbrook Utility District, Harris County MUD 33 and Forest Hills MUD.
From EPA's record for TX1010426. PurityMap is independent of Harris County MUD 11.
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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 April 2024 to February 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 28.6 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 | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| 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 | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| 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 | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| 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 | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| 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 | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| 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 | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| 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 | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-25 to 2025-02-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 11 (TX1010426) |
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 11'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 11 uses groundwater from its own wells, and buys water from Fallbrook Utility District, Harris County MUD 33 and Forest Hills MUD.
No health-based violations on EPA record since 2016. EPA also lists 1 missed or late test or report in 10 years. The record comes from EPA's SDWIS compliance database.
Lead was not detected at the 90th percentile of tap samples in Harris County MUD 11's latest lead and copper round, which ended in December 2023. The federal action level is 15 µg/L.
PurityMap has no verified website for Harris County MUD 11. 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.