Friday, November 8, 2013:

Saturday, November 16, 2013 - 8:00 AM to 12:00 PM ET - Database Upgrades: CDX Web and the Exchange Network may experience intermittent outages due to database maintenance.

Thursday, October 31, 2013:

Saturday, November 2, 2013 - 8:00 AM to 12:00 PM ET - Database Upgrades: The CDX Pre-Production Environment may experience intermittent outages due to database maintenance.

Friday, September 13, 2013:

Sunday, September 15, 2013 - 9:00 AM to 5:00 PM ET - Software Updates at NCC: SDWIS, WQX, and other CDX backend flows will be unavailable due to Software Updates.

Friday, September 6, 2013:

Saturday, September 21, 2013 - 6:00 AM to 12:00 PM ET - Server Upgrades: CDX and the Exchange Network will be unavailable due to server upgrades.

Friday, September 6, 2013:

Sunday, September 8, 2013 - 8:00 PM to 12:00 AM ET - Server Maintenance at NCC: SDWIS, WQX, and other CDX backend flows in both the Staging and Production environments will be impacted due to server maintenance.

Friday, September 6, 2013:

Saturday, September 7, 2013 - 6:00 AM to 12:00 PM ET - Database Maintenance at NCC: SDWIS, WQX, and other CDX backend flows will be unavailable due to database maintenance.

Thursday, August 15, 2013:

Tuesday, August 20, 2013 - 5:00 AM to 6:30 AM ET - Server Maintenance: CDX and the Exchange Network may experience intermittent outages due to server maintenance.

Friday, July 26, 2013:

The EPA Environmental Appeals Board eFiling system will migrate to a new eFiling portal. All registered CDX users must register on the new system prior to use. For more details click here.