Monday, March 26, 2012:

Friday, March 30, 2012 - 5:00 PM to Monday, April 2, 8:00 AM ET - Application Maintenance: Verify will be unavailable due to scheduled maintenance.

Friday, February 3, 2012:

Saturday, March 3, 2012 - 6:00 AM to 12:00 PM ET - Database Upgrades: CDX Web and the Exchange Network may experience intermittent outages due to database maintenance.

Thursday, February 2, 2012:

Saturday, February 11, 2012 - 8:00 AM to 2:00 PM ET - Database Upgrades: The CDX Pre-Production Environment may experience intermittent outages due to database maintenance.

Wednesday, December 28, 2011:

Wednesday, December 28, 2011 - 6:00 PM through Thursday, December 29, 2011 2:00 AM ET: The CDX Pre-Production Environment may experience intermittent outages due to electrical maintenance.

Saturday, December 3, 2011:

Saturday, December 3, 2011 - 6:00 AM to 12:00 PM ET - Database Upgrades: CDX Web and the Exchange Network may experience intermittent outages due to database maintenance.

Sunday, November 20, 2011:

November 20, 2011 - The Central Data Exchange (CDX) web site will be modernized to leverage newly approved EPA web standards for Agency Public Access websites. The material functionality within CDX will be unaffected by these updates; a preview of the updates is available here.

Saturday, November 19, 2011:

Saturday, November 19, 2011 - 8:00 AM to 2:00 PM ET - Database Upgrades: The CDX Pre-Production Environment may experience intermittent outages due to database maintenance.

Sunday, November 13, 2011:

Sunday, November 13, 2011 - 7:00 PM to 11:00 PM ET - CDX Web and the Exchange Network may experience intermittent outages due to server maintenance.