Bay County, Michigan: drinking water report. Bay County sits where the Saginaw River empties into Saginaw Bay on Lake Huron, with a population of about…
Bay County sits where the Saginaw River empties into Saginaw Bay on Lake Huron, with a population of about 103,000. Bay City and surrounding communities draw water from the Saginaw River and Lake Huron through the Bay County Water Authority. The Saginaw River drains one of the largest watersheds in Michigan, collecting agricultural runoff and industrial discharges from across the central part of the state before reaching Bay County's intake.
The Saginaw River watershed has a long industrial history. According to the Michigan EGLE's 2024 surface water assessment, the river carries elevated levels of dioxins and PCBs from legacy chemical manufacturing upstream. Dow Chemical's Midland operations, roughly 30 miles upstream, contributed dioxin contamination that persists in river sediments decades after the original discharges.
The EPA's UCMR5 monitoring detected PFAS compounds in Bay County's water system during the 2023-2024 sampling period. Former Tri-City Airport and the defunct Dow military contracts site both used AFFF firefighting foam. A 2024 Michigan EGLE report found PFOS at 8 ppt in one Bay County monitoring point – below the federal MCL of 4 ppt individually but contributing to cumulative exposure when combined with other PFAS compounds present.
Bay County's position at the bottom of a large watershed means your water carries whatever the river picks up along the way. Treatment plants handle most regulated contaminants, but emerging compounds like PFAS require additional attention.
We recommend checking your water for the latest monitoring results at your address. For PFAS and legacy industrial contaminants, reverse osmosis at the tap provides the broadest household protection. Our water filter guide ranks systems by independent lab verification. Pull your detailed report for trend data, and visit our Michigan page for statewide patterns.