No open health-based violations on EPA record in the last 10 years; latest legal-limit breach in the period starting January 2020.
Serves about 7,773 people (2,591 connections) with surface water bought from Mayde Creek MUD and West Harris County Regional Water Author.
From EPA's record for TX1012361. PurityMap is independent of Harris County MUD 238.
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6 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From January 2020 | Gross alpha particles | 16 pCi/L | 15 pCi/L | Resolved |
| From October 2019 | Gross alpha particles | 16 pCi/L | 15 pCi/L | Resolved |
| From January 2019 | Gross alpha particles | 16 pCi/L | 15 pCi/L | Resolved |
| From October 2018 | Gross alpha particles | 17 pCi/L | 15 pCi/L | Resolved |
| From July 2018 | Gross alpha particles | 17 pCi/L | 15 pCi/L | Resolved |
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From April 2018 | Gross alpha particles | 16 pCi/L | 15 pCi/L | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from March 2024 to May 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 20.7 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 | 2024-03-12 to 2024-12-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| Perfluorohexanoic acid (PFHxA) | 4.8 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2024-03-12 to 2025-05-05 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| Perfluorobutanoic acid (PFBA) | 8.3 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2024-03-12 to 2025-05-05 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| Perfluoropentanoic acid (PFPeA) | 5.8 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2024-03-12 to 2025-05-05 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| 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 | 2024-03-12 to 2025-05-05 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| 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 | 2024-03-12 to 2025-05-05 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| 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 | 2024-03-12 to 2025-05-05 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| 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 | 2024-03-12 to 2025-05-05 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-12 to 2025-05-05 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| 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 | 2024-03-12 to 2025-05-05 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-03-12 to 2025-05-05 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-12 to 2024-12-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-12 to 2024-12-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-12 to 2025-05-05 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-12 to 2025-05-05 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-12 to 2025-05-05 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-12 to 2025-05-05 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| 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 | 2024-03-12 to 2025-05-05 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-12 to 2025-05-05 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-12 to 2025-05-05 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-12 to 2025-05-05 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-12 to 2025-05-05 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-03-12 to 2025-05-05 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-03-12 to 2025-05-05 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-03-12 to 2025-05-05 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-03-12 to 2025-05-05 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-12 to 2025-05-05 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-12 to 2024-12-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-12 to 2024-12-10 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-12 to 2025-05-05 | UCMR5 Analytical Results: HARRIS COUNTY MUD 238 (TX1012361) |
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 →Harris County MUD 238's phone number on EPA record is 832-390-2268. Its mailing address is 480 WILDWOOD FOREST DR STE 140, THE WOODLANDS, TX 77380-3772.
According to EPA's record, Harris County MUD 238 uses surface water bought from Mayde Creek MUD and West Harris County Regional Water Author.
EPA's record shows 6 health-based violations for Harris County MUD 238 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 January 2020. EPA also lists 2 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Harris County MUD 238's latest lead and copper round, which ended in December 2023, was 0.534 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Harris County MUD 238. Its phone number on EPA record is 832-390-2268. Its mailing address on EPA record is 480 WILDWOOD FOREST DR STE 140, THE WOODLANDS, TX 77380-3772. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.