No health-based violations on EPA record since 2016.
Serves about 7,389 people (2,463 connections) with groundwater bought from Harris County MUD 418.
From EPA's record for TX1013335. PurityMap is independent of Harris County MUD 419.
Are you this utility? Correct this listing →
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 November 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorohexanoic acid (PFHxA) | 4.1 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| Perfluorobutanoic acid (PFBA) | 6.1 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| Perfluoropentanoic acid (PFPeA) | 4.4 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| 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 | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| 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 | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| 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 | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| 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 | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| 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 | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| Lithium | < 9 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2025-04-22 to 2025-11-06 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| 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 | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-22 | UCMR5 Analytical Results: HARRIS COUNTY MUD 419 (TX1013335) |
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure
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 419's phone number on EPA record is 713-623-4531. Its mailing address is 1300 POST OAK BLVD STE 2400, HOUSTON, TX 77056-3044.
According to EPA's record, Harris County MUD 419 uses groundwater bought from Harris County MUD 418.
No health-based violations on EPA record since 2016. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Harris County MUD 419's latest lead and copper round, which ended in December 2024, was 1.11 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Harris County MUD 419. Its phone number on EPA record is 713-623-4531. Its mailing address on EPA record is 1300 POST OAK BLVD STE 2400, HOUSTON, TX 77056-3044. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.