User Support and Agency Contacts
AQS User Support is provided through the
EPA Call Center, which is operated under contract to the EPA.
The toll free number is 1-866-411-4EPA (4372). TDD: 1-866-489-4900 International callers: 1-703-679-1070
Their hours of operation are 6:00am - 9:00pm E.T. (Monday - Friday, excluding Federal holidays). You may also contact the Call Center via email (EPACALLCENTER@epa.gov) or fax (703-674-1008).
Contact a National or Regional EPA representative or a State, Local, or Tribal Agency representative