No open health-based violations on EPA record in the last 10 years; latest legal-limit breach in the period starting April 2019.
Serves about 5,961 people (1,973 connections) with groundwater from its own wells, and buys water from Harris County MUD 168 and West Harris County MUD 10.
From EPA's record for TX1011798. PurityMap is independent of West Harris County MUD 9.
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4 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From April 2019 | Gross alpha particles | 16 pCi/L | 15 pCi/L | Resolved |
| From January 2019 | Gross alpha particles | 18 pCi/L | 15 pCi/L | Resolved |
| From October 2018 | Gross alpha particles | 18 pCi/L | 15 pCi/L | Resolved |
| From July 2018 | Gross alpha particles | 16 pCi/L | 15 pCi/L | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from June 2023 to March 2024.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 14.1 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 | 2023-06-19 to 2023-12-13 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| 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 | 2023-06-19 to 2023-12-13 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| 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 | 2023-06-19 to 2023-12-13 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| 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 | 2023-06-19 to 2023-12-13 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| 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 | 2023-06-19 to 2023-12-13 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-19 to 2023-12-13 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| 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 | 2023-06-19 to 2023-12-13 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-19 to 2023-12-13 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-19 to 2024-03-20 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-19 to 2024-03-20 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-19 to 2023-12-13 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-19 to 2023-12-13 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-19 to 2023-12-13 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-19 to 2023-12-13 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| 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 | 2023-06-19 to 2023-12-13 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-19 to 2023-12-13 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-19 to 2023-12-13 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-19 to 2023-12-13 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-19 to 2023-12-13 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-19 to 2023-12-13 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-19 to 2023-12-13 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-06-19 to 2023-12-13 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-19 to 2023-12-13 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-19 to 2023-12-13 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-19 to 2023-12-13 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-19 to 2023-12-13 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-19 to 2023-12-13 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-19 to 2024-03-20 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-19 to 2024-03-20 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-19 to 2023-12-13 | UCMR5 Analytical Results: WEST HARRIS COUNTY MUD 9 (TX1011798) |
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 →West Harris County MUD 9's phone number on EPA record is 713-739-1060. Its mailing address is 6363 WOODWAY DR STE 800, HOUSTON, TX 77057-1762.
According to EPA's record, West Harris County MUD 9 uses groundwater from its own wells, and buys water from Harris County MUD 168 and West Harris County MUD 10.
EPA's record shows 4 health-based violations for West Harris County MUD 9 in the 10 years to July 9, 2026. No open health-based violations on EPA record in the last 10 years. The latest legal-limit breach on record was in the period starting April 2019. The record comes from EPA's SDWIS compliance database.
Lead was not detected at the 90th percentile of tap samples in West Harris County MUD 9'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 West Harris County MUD 9. Its phone number on EPA record is 713-739-1060. Its mailing address on EPA record is 6363 WOODWAY DR STE 800, HOUSTON, TX 77057-1762. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.