The Ridgefield Planning and Zoning Commission and the Inland Wetlands Board have signed off on plans for improvements to the sewer plant. Ridgefield residents approved a 48 million dollar sewer project in the fall. The new approvals are to reduce nitrogen and phosphorous discharges at the District I plant. That would lead to consolidation of plants. Wastewater treatment for District II in the Route 7 and 35 area would be piped to the District I plant on South Street. The renovated plant will have an odor control system.