No health-based violations on EPA record since 2016.
Serves about 7,671 people (3,197 connections) with groundwater from its own wells.
From EPA's record for TX1011649. PurityMap is independent of Northwest Harris County MUD 10.
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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 2025 to October 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 42.8 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 | 2025-02-12 to 2025-08-11 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| 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 | 2025-02-12 to 2025-08-11 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| 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 | 2025-02-12 to 2025-08-11 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| 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 | 2025-02-12 to 2025-08-11 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| 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 | 2025-02-12 to 2025-08-11 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-12 to 2025-08-11 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| 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 | 2025-02-12 to 2025-08-11 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-12 to 2025-08-11 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-12 to 2025-10-07 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-12 to 2025-10-07 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-12 to 2025-08-11 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-12 to 2025-08-11 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-12 to 2025-08-11 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-12 to 2025-08-11 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| 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 | 2025-02-12 to 2025-08-11 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-12 to 2025-08-11 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-12 to 2025-08-11 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-12 to 2025-08-11 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-12 to 2025-08-11 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-12 to 2025-08-11 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-12 to 2025-08-11 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2025-02-12 to 2025-08-11 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-12 to 2025-08-11 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-12 to 2025-08-11 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-12 to 2025-08-11 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-12 to 2025-08-11 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-12 to 2025-08-11 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-12 to 2025-10-07 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-12 to 2025-10-07 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-12 to 2025-08-11 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 10 (TX1011649) |
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 →Northwest Harris County MUD 10'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, Northwest Harris County MUD 10 uses groundwater from its own wells.
No health-based violations on EPA record since 2016. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Northwest Harris County MUD 10's latest lead and copper round, which ended in December 2023, was 0.601 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Northwest Harris County MUD 10. 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.