No health-based violations on EPA record since 2016.
Serves about 8,465 people (3,323 connections) with surface water bought from Bay Area Water System.
From EPA's record for MI0000485. PurityMap is independent of Bay Co. Dept of Water & Sewer.
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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 January 2025 to October 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| 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 | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| 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 | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| 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 | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| 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 | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| 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 | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| 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 | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| 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 | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-10-13 | UCMR5 Analytical Results: BAY CO. DEPT OF WATER & SEWER (MI0000485) |
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 →Bay Co. Dept of Water & Sewer's phone number on EPA record is 989-684-3883. Its mailing address is 3933 PATTERSON RD, BAY CITY, MI 48706.
According to EPA's record, Bay Co. Dept of Water & Sewer uses surface water bought from Bay Area Water System.
No health-based violations on EPA record since 2016. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Bay Co. Dept of Water & Sewer's latest lead and copper round, which ended in December 2025, was 3.5 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Bay Co. Dept of Water & Sewer. Its phone number on EPA record is 989-684-3883. Its mailing address on EPA record is 3933 PATTERSON RD, BAY CITY, MI 48706. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.