Home Fairfield Lonza not long for Norwalk FairfieldHudson ValleyPremium ContentReal EstateWestchester Lonza not long for Norwalk By Alexander Soule - April 20, 2012 Six months after acquiring Arch Chemicals, Lonza is leaving Norwalk. This content is for Westfair Online members only. Please Sign in / Join to view this content. Become a member by Registering Here.