A settling tank at Norwalk's wastewater treatment plant. It would be upgraded with a spiral scraper in a long range plan developed by engineering firm .
Norwalk WPCA plans wastewater treatment plant upgrade; $25M is temporary figure nancyonnorwalk.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from nancyonnorwalk.com Daily Mail and Mail on Sunday newspapers.