FLINT, Mich. - A Michigan federal judge on March 3 denied a motion to dismiss and granted a motion for class certification in a case filed by residential communities in the City of Detroit challenging the city's policy of charging them the higher commercial rates for water and sewage instead of residential rates (LaSalle Town Houses Cooperative Association, et al. v. City of Detroit, et al., No. 12-13747, E.D. Mich.; 2014 U.S. Dist. LEXIS 26490).