No health-based violations on EPA record since 2016.
Serves about 3,749 people (1,420 connections) with groundwater from its own wells.
From EPA's record for MS0410033. PurityMap is independent of Old Union Water System.
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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 | 24.8 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 | 2025-04-15 to 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| 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 | 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| 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 | 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| 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 | 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| 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 | 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| 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 | 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-15 to 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-15 to 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| 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 | 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-15 to 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-15 to 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-10-15 | UCMR5 Analytical Results: OLD UNION WATER SYSTEM (MS0410033) |
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 →Old Union Water System's phone number on EPA record is 662-995-1269. Its mailing address is 1932-A CR 506, SHANNON, MS 38868.
According to EPA's record, Old Union Water System uses groundwater from its own wells.
No health-based violations on EPA record since 2016. EPA also lists 17 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Old Union Water System's latest lead and copper round, which ended in December 2025, was 0.7 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Old Union Water System. Its phone number on EPA record is 662-995-1269. Its mailing address on EPA record is 1932-A CR 506, SHANNON, MS 38868. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.