No health-based violations on EPA record since 2016.
Serves about 7,848 people (2,616 connections) with groundwater from its own wells, and buys water from Mills Road MUD and Cypress Creek Utility District.
From EPA's record for TX1011599. PurityMap is independent of Northwest Harris County MUD 9.
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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 March 2023 to August 2023.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 9.85 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Within the referenced health-based guidance value | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| 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 | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| 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 | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| 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 | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| 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 | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| 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 | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| 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 | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-15 to 2023-08-08 | UCMR5 Analytical Results: NORTHWEST HARRIS COUNTY MUD 9 (TX1011599) |
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 9's phone number on EPA record is 281-646-2340. Its mailing address is 2727 ALLEN PKWY STE 1100, HOUSTON, TX 77019-2191.
According to EPA's record, Northwest Harris County MUD 9 uses groundwater from its own wells, and buys water from Mills Road MUD and Cypress Creek Utility District.
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.
The 90th-percentile lead result in Northwest Harris County MUD 9's latest lead and copper round, which ended in June 2026, was 43.8 µg/L, above the federal action level of 15 µg/L.
PurityMap has no verified website for Northwest Harris County MUD 9. Its phone number on EPA record is 281-646-2340. 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.