No health-based violations on EPA record since 2016.
Serves about 6,663 people (7,477 connections) with surface water bought from Fort Bend County MUD 122 and North Fort Bend Water Authority.
From EPA's record for TX0790430. PurityMap is independent of Grand Mission MUD 1.
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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 January 2025 to October 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 16.6 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 | 2025-01-13 to 2025-10-20 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| Perfluorohexanoic acid (PFHxA) | 4.2 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| Perfluorobutanoic acid (PFBA) | 6.3 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| Perfluoropentanoic acid (PFPeA) | 5.1 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| 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 | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| 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 | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| 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 | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| 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 | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| 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 | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| 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 | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-16 | UCMR5 Analytical Results: GRAND MISSION MUD 1 (TX0790430) |
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 →Grand Mission MUD 1's phone number on EPA record is 713-651-0111. Its mailing address is 9 GREENWAY PLZ STE 1100, HOUSTON, TX 77046-0905.
According to EPA's record, Grand Mission MUD 1 uses surface water bought from Fort Bend County MUD 122 and North Fort Bend Water Authority.
No health-based violations on EPA record since 2016. The record comes from EPA's SDWIS compliance database.
Lead was not detected at the 90th percentile of tap samples in Grand Mission MUD 1's latest lead and copper round, which ended in December 2025. The federal action level is 15 µg/L.
PurityMap has no verified website for Grand Mission MUD 1. Its phone number on EPA record is 713-651-0111. Its mailing address on EPA record is 9 GREENWAY PLZ STE 1100, HOUSTON, TX 77046-0905. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.