After the Seminole Tribe of Florida launched a legal challenge earlier in the month, Miami and a paper-mill industry group also are taking aim at controversial new state water-quality standards.

The city and the group Florida Pulp and Paper Association Environmental Affairs Inc. filed separate challenges during the past week in the state Division of Administrative Hearings, records show. The challenges raise substantially different arguments in fighting the standards, which were developed by the Florida Department of Environmental Protection and approved in July by the state Environmental Regulation Commission.