Bedford Heights, Strongsville, and Lyndhurst are among those contesting the sewer district's authority, which includes the power to pass a fee along to landholders.
Under the program's rules, home and business owners throughout the district's service area were charged based on "impervious surfaces"-- defined as areas like rooftops, driveways, and garages.
District officials say that amounts to roughly five dollars a month for the average homeowner, and the group's attorney says previous legal findings allow the fee.
The Ohio Supreme Court will review whether or not the district is authorized to regionally manage stormwater not combined with sewage, and whether it can legally charge for such a program.
Following arguments, justices will review the case and hand down their decision, which may take up to several months.