Wayne County, Michigan: drinking water report. Wayne County includes Detroit and dozens of surrounding communities, with a population of about 1.7 million.
Wayne County includes Detroit and dozens of surrounding communities, with a population of about 1.7 million. The Great Lakes Water Authority (GLWA) treats Lake Huron water and distributes it to Detroit and over 100 wholesale customers across southeastern Michigan. The treatment system is massive – GLWA operates one of the largest water treatment plants in the world – but the distribution infrastructure, particularly within the City of Detroit, includes pipes that are well over a century old.
Michigan's experience with the Flint water crisis made lead in drinking water a statewide concern, and Wayne County is not immune. While Detroit's water chemistry is managed to minimize lead leaching, older homes with lead service lines remain at risk. The Michigan Department of Environment, Great Lakes, and Energy estimates that thousands of lead service lines remain in service across Wayne County communities.
On PFAS, Michigan has been one of the most aggressive states in testing and regulation. The state has adopted MCLs for seven PFAS compounds – among the most of any state. UCMR5 data for Wayne County shows low-level detections in the GLWA system, with higher readings in some communities drawing supplemental groundwater near Willow Run Airport and other industrial sites.
Lead is the primary household-level concern in Wayne County, particularly in homes built before 1950. PFAS levels in the Lake Huron-sourced supply are generally low, but vary for communities using supplemental groundwater.
Check your water to see data for your specific provider. If lead is a concern, a pitcher filter certified to NSF/ANSI 53 for lead reduction is an affordable first step. Our water filter guide covers options for both lead and PFAS. Pull your detailed report for historical data, and visit our Michigan page for statewide context.
Drinking water is one exposure route. These federal datasets also cover Wayne County, MI.
The EPA places Wayne County, MI in Zone 3 - the EPA's lowest-risk category, with a predicted average indoor radon level below 2 pCi/L. Zone maps predict an area's radon potential from geology and existing indoor readings; they say nothing about a specific house. Testing is the only way to know your own level.
81% of homes in Wayne County, MI were built before 1980, and 35% before 1950. Residential lead paint was banned in 1978, so housing age is the strongest available proxy for lead-paint exposure. This describes the county's housing stock, not any one home.
Modelled annual fine-particle pollution (PM2.5) in Wayne County, MI averages 9.5 µg/m³, above the EPA's annual standard of 9 µg/m³. These are CDC modelled county estimates rather than readings from a specific monitor.
How radon zones work · Air quality by county · Lead exposure guide