CDXCentral Data Exchange

Contact Us

Click here to view current status for all Program Services.

By Telephone:
Person-to-person telephone support is available from 8:00 am to 6:00 pm (ET). Call our toll-free line at 888-890-1995. (970) 494-5500 for International callers.

By E-mail:
Send e-mail to Technical Support at

By Chat:
Chat with the CDX Help Desk Exit to answer your questions.

Contact Form

EPA welcomes your comments, especially comments on how we can improve our Web site. We strive to respond to every comment with an answer or an appropriate referral as quickly as possible. Most comments will be responded to within 2-3 business days.

Please help us answer your request by including a correct e-mail address. We have answered thousands of requests, but we receive many messages that we can't respond to because of incorrect email addresses. Also, if you are referring to a specific page within the EPA CDX web site, please include a URL or title for the page. If your browser doesn't support forms, you can e-mail your comment to us at