No health-based violations on EPA record since 2016.
Serves about 4,005 people (1,335 connections) with surface water bought from Harris County MUD 208, Harris County MUD 149, Harris County MUD 257 and 2 more.
From EPA's record for TX1012214. PurityMap is independent of Harris County MUD 186.
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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 March 2023 to December 2023.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 20.9 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 | 2023-03-20 to 2023-12-11 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| 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 | 2023-03-20 to 2023-12-19 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| Perfluorohexanoic acid (PFHxA) | 5.8 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2023-03-20 to 2023-12-19 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| Perfluorobutanoic acid (PFBA) | 7.3 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-03-20 to 2023-12-19 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| Perfluoropentanoic acid (PFPeA) | 6.5 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-03-20 to 2023-12-19 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| 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 | 2023-03-20 to 2023-12-19 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| 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 | 2023-03-20 to 2023-12-19 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| 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 | 2023-03-20 to 2023-12-19 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| 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 | 2023-03-20 to 2023-12-19 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-20 to 2023-12-19 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| 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 | 2023-03-20 to 2023-12-19 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-20 to 2023-12-19 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-20 to 2023-12-11 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-20 to 2023-12-11 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-20 to 2023-12-19 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-20 to 2023-12-19 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-20 to 2023-12-19 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-20 to 2023-12-19 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-20 to 2023-12-19 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-20 to 2023-12-19 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-20 to 2023-12-19 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-20 to 2023-12-19 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-20 to 2023-12-19 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-20 to 2023-12-19 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-20 to 2023-12-19 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-20 to 2023-12-19 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-20 to 2023-12-19 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-20 to 2023-12-11 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-20 to 2023-12-11 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-20 to 2023-12-19 | UCMR5 Analytical Results: HARRIS COUNTY MUD 186 (TX1012214) |
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 186's phone number on EPA record is 713-651-5401. Its mailing address is 1550 LAMAR ST STE 2000, HOUSTON, TX 77010-4106.
According to EPA's record, Harris County MUD 186 uses surface water bought from Harris County MUD 208, Harris County MUD 149, Harris County MUD 257 and 2 more.
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 Harris County MUD 186's latest lead and copper round, which ended in December 2024, was 1.8 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Harris County MUD 186. Its phone number on EPA record is 713-651-5401. Its mailing address on EPA record is 1550 LAMAR ST STE 2000, HOUSTON, TX 77010-4106. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.