Can a city override a federal wetland designation? [Illinois]

r/

Location: Chicagoland

I’m consulting for a company who remediated a previously contaminated site, and is developing it

According to the Army Corps of Engineers, there are 2 wetlands on the property. All GIS maps align with this designation—including the city’s own maps

However the city refuses to recognize one of the wetlands, as a wetland. They have provided no reason for the denial, despite meeting all requirements

My understanding is that a city can have additional rules on top of federal, state, and county ones, but they cannot override the original designation

Is there some sort of exception or little-known rule they may be relying on to do this?

Or is this an overstep on their part & not legally permitted?

Thank you for your help!!