The St. Clair County Health Department issued a swimming advisory for Holland Beach in Port Huron after tests found high levels of E. coli bacteria in the water. This bacteria, often linked to fecal contamination, can cause stomach illness and skin infections. Officials say bacteria levels can rise after storms or strong winds due to runoff and waves stirring up the water. Until tests show safe levels, swimming is not recommended. Local beachgoers can stay updated on advisories through the county’s social page and the state’s Beachguard website.