Your compliance testing schedule is based upon the total number of people served directly by a water system. Typically, your state will help you determine population served for compliance purposes. If your state did not send you a letter with your testing schedule, contact your state to find out. Note that your testing schedule should be the same as your IDSE schedule. Stage 2 DBPR IDSE Standard Monitoring Factsheet, Stage 2 DBPR IDSE System Specific Study Factsheet, Stage 2 DBPR IDSE 40/30 Certification and Very Small System Wavier Factsheet Download Stage 2 Compliance Deadlines.