No health-based violations on EPA record since 2016.
Serves about 4,833 people (1,612 connections) with groundwater from its own wells.
From EPA's record for TX0200610. PurityMap is independent of Brazoria County MUD 21.
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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 2024 to August 2024.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 41.7 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 | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| 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 | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| 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 | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| 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 | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| 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 | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| 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 | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| 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 | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-07 to 2024-08-14 | UCMR5 Analytical Results: BRAZORIA COUNTY MUD 21 (TX0200610) |
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 →Brazoria County MUD 21's phone number on EPA record is 713-860-6400. Its mailing address is 3200 SOUTHWEST FWY STE 2600, HOUSTON, TX 77027-7537.
According to EPA's record, Brazoria County MUD 21 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 Brazoria County MUD 21's latest lead and copper round, which ended in December 2025, was 1.2 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Brazoria County MUD 21. Its phone number on EPA record is 713-860-6400. Its mailing address on EPA record is 3200 SOUTHWEST FWY STE 2600, HOUSTON, TX 77027-7537. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.