Grand Traverse County beach monitoring begins Monday for summer safety

A calm-looking beach on East or West Grand Traverse Bay can turn unsafe after a storm, which is why Grand Traverse County is launching its annual beach monitoring program Monday, June 22. The county checks five public beaches so families can make a safer call before a swim, a wade, or a day of water play.

The Environmental Health Division works with the Watershed Center Grand Traverse Bay, the City of Traverse City, and Traverse City State Park to watch the county’s public shoreline. Grand Traverse County’s posted beach reports say samples are collected once a week and analyzed for E. coli, the bacteria most closely tied to sewage and runoff contamination in recreational water. Officials say that routine schedule matters because levels can change between sampling days, especially after a storm.

The county uses a composite sampling method approved by the Michigan Department of Environment, Great Lakes, and Energy. When results come back, they are entered into BeachGuard by local health departments and now sit inside EGLE’s MiEnviro Portal, giving residents a statewide place to check beach test results. That system gives the public a clearer picture than a simple open-or-closed sign, because the county says advisories depend on measured bacteria levels, not on whether the water looks clear.

Health Department of Northwest Michigan guidance says beach advisories go out when bacteria levels rise above what is considered safe for partial contact, full-body contact, or any water contact at all. The same system posts updates when conditions return to a safe level, which can help keep families from missing a good beach day or, just as important, from stepping into water that could carry avoidable illness risk. In a county where public shoreline is part of summer life, that kind of warning system is a public-health service, not a bureaucratic extra.

The monitoring effort also fits into a broader regional network. In 2025, the Watershed Center Grand Traverse Bay said it would test 21 beaches across Benzie, Grand Traverse, and Leelanau counties every Wednesday through September 10. In 2024, it tested 20 beaches beginning June 12 and continuing through September 4. For Grand Traverse County, the beach reports are part of the hidden infrastructure of summer, helping protect residents, visitors, and the public beaches that anchor the local waterfront economy.