No health-based violations on EPA record since 2016.
Serves about 13,197 people (4,399 connections) with groundwater from its own wells, and buys water from Chelford One MUD and Harris County MUD 147.
From EPA's record for TX1010774. PurityMap is independent of Harris County MUD 120.
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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 May 2023 to November 2023.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 22.7 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 | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| 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 | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| 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 | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| 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 | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| 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 | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| 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 | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| 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 | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-03 to 2023-11-17 | UCMR5 Analytical Results: HARRIS COUNTY MUD 120 (TX1010774) |
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 120's phone number on EPA record is 713-860-6400. Its mailing address is 3200 SOUTHWEST FWY STE 2600, ALLEN BOONE HUMPHRIES ROBINSON LLP, HOUSTON, TX 77027-7537.
According to EPA's record, Harris County MUD 120 uses groundwater from its own wells, and buys water from Chelford One MUD and Harris County MUD 147.
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 120's latest lead and copper round, which ended in December 2025, was 1.92 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Harris County MUD 120. Its phone number on EPA record is 713-860-6400. Its mailing address on EPA record is 3200 SOUTHWEST FWY STE 2600, ALLEN BOONE HUMPHRIES ROBINSON LLP, HOUSTON, TX 77027-7537. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.