No health-based violations on EPA record since 2016.
Serves about 4,881 people (1,627 connections) with surface water bought from Harris County MUD 367, Harris County MUD 119 and North Harris County Regional Water Autho.
From EPA's record for TX1013213. PurityMap is independent of Harris County MUD 383.
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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 April 2025 to October 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 47.6 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 | 2025-04-25 to 2025-10-16 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| Perfluorohexanoic acid (PFHxA) | 3.6 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| Perfluorobutanoic acid (PFBA) | 5.5 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| Perfluoropentanoic acid (PFPeA) | 4.2 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| 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 | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| 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 | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| 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 | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| 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 | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| 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 | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| 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 | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-25 | UCMR5 Analytical Results: HARRIS COUNTY MUD 383 (TX1013213) |
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 383's phone number on EPA record is 713-983-3000. Its mailing address is 3200 SOUTHWEST FWY STE 2600, HOUSTON, TX 77027-7537.
According to EPA's record, Harris County MUD 383 uses surface water bought from Harris County MUD 367, Harris County MUD 119 and North Harris County Regional Water Autho.
No health-based violations on EPA record since 2016. 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 383's latest lead and copper round, which ended in December 2023, was 0.987 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Harris County MUD 383. Its phone number on EPA record is 713-983-3000. 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.