No open health-based violations on EPA record in the last 10 years; latest legal-limit breach in the period starting October 2022.
Serves about 4,446 people (1,494 connections) with groundwater from its own wells.
From EPA's record for LA1099009. PurityMap is independent of United Water System.
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17 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From October 2022 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| From May 2022 | Groundwater Rule | – | – | Resolved |
| From May 2022 | Groundwater Rule | – | – | Resolved |
| From May 2022 | Groundwater Rule | – | – | Resolved |
| From April 2020 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From January 2020 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| From October 2019 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| From July 2019 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| From April 2019 | Arsenic | 0.012 mg/L | 0.010 mg/L | Resolved |
| From January 2019 | Arsenic | 0.013 mg/L | 0.010 mg/L | Resolved |
| From October 2018 | Arsenic | 0.014 mg/L | 0.010 mg/L | Resolved |
| From July 2018 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| From January 2018 | Arsenic | 0.012 mg/L | 0.010 mg/L | Resolved |
| From October 2017 | Arsenic | 0.012 mg/L | 0.010 mg/L | Resolved |
| From July 2017 | Lead and Copper Rule | – | TT | Resolved |
| From July 2017 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
| From April 2017 | Arsenic | 0.011 mg/L | 0.010 mg/L | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from August 2024 to February 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 11.2 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 | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| 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 | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| 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 | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| 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 | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| 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 | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| 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 | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| 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 | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-07 to 2025-02-03 | UCMR5 Analytical Results: UNITED WATER SYSTEM (LA1099009) |
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.
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Follow this water →United Water System's phone number on EPA record is 337-654-1551. Its mailing address is United Water System, 1004 Twin Oaks Drive, ARNAUDVILLE, LA 70512.
According to EPA's record, United Water System uses groundwater from its own wells.
EPA's record shows 17 health-based violations for United Water System 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 October 2022. EPA also lists 5 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in United Water System's latest lead and copper round, which ended in December 2023, was 2 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for United Water System. Its phone number on EPA record is 337-654-1551. Its mailing address on EPA record is United Water System, 1004 Twin Oaks Drive, ARNAUDVILLE, LA 70512. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.