No health-based violations on EPA record since 2016.
Serves about 7,365 people (2,455 connections) with groundwater bought from Sienna Regional MUD.
From EPA's record for TX0790376. PurityMap is independent of Sienna MUD 3.
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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 2023 to November 2023.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 25 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 | 2023-02-20 to 2023-08-23 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| Perfluorobutanesulfonic acid (PFBS) | 3.2 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Within the referenced health-based guidance value | 2023-02-20 to 2023-11-27 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| Perfluorohexanoic acid (PFHxA) | 4.7 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2023-02-20 to 2023-11-27 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| Perfluorobutanoic acid (PFBA) | 23 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-02-20 to 2023-11-27 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| Perfluoropentanoic acid (PFPeA) | 130 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-02-20 to 2023-11-27 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| 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 | 2023-02-20 to 2023-11-27 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| 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 | 2023-02-20 to 2023-11-27 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| 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 | 2023-02-20 to 2023-11-27 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| 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 | 2023-02-20 to 2023-11-27 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-27 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| 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 | 2023-02-20 to 2023-11-27 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-20 to 2023-11-27 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-08-23 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-08-23 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-27 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-27 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-27 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-27 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-27 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-27 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-27 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-27 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-20 to 2023-11-27 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-20 to 2023-11-27 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-20 to 2023-11-27 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-20 to 2023-11-27 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-27 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-08-23 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-08-23 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-27 | UCMR5 Analytical Results: SIENNA MUD 3 (TX0790376) |
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 →Sienna MUD 3'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, Sienna MUD 3 uses groundwater bought from Sienna Regional MUD.
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 Sienna MUD 3's latest lead and copper round, which ended in December 2025, was 0.5 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Sienna MUD 3. 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.