You are mistaken. Petitions for writs of quo warranto within the District of Columbia must be filed in the U.S. District Court for the District of Columbia and not in a municipal court.
The Supreme Court has ruled that absent any legislation Writs of Quo Warrento can only be filed by the United States. The only place that has a law in place allowing for individuals to file such a writ is D.C. And they require it be filed in the D.C. Dstrict Court.