The Kalona Cheese House remains open. The factory portion of the business was closed by majority owner Proliant Dairy on Thursday. According to Proliant spokesperson Jeff Staton, the plant would have required a substantial capital investment to meet environmental and food safety standards. The factory has exceeded its pollutant discharge limits for nearly a decade. To bring the factory into compliance, the Environmental Protection Agency has been negotiating with Twin Counties Dairy LLC for the past nine months.