The perc NESHAP was implemented in the early 1990s, and has been amended or updated by EPA to reduce perc emissions and protect worker health and the environment. As a result, EPA estimates its most recent rule reduced perc emissions by an estimated 5,700 tons per year. Today most dry cleaners are moving away from perc and using less-toxic alternatives. At a minimum, perc dry cleaners must comply with the following: 

• File an initial notification for the perc NESHAP. 
• Use modern dry-to-dry machines equipped with a refrigerated condenser or equivalent control device. 
• Inspect the system weekly for perc leaks, using a perc gas analyzer for this inspection at least once each month. 
• Maintain records of perc purchases and monthly perc purchase running totals. 
• Repair or address any air leaks within 24 hours. 
• Manage all separator-water issues. 
• Maintain records for at least five years.