The Exchange Network

**IMPORTANT UPDATE April 13, 2020: Two new versions of the WQX data flow (v2.2 and v3.0) are now available and in production. EPA will continue to support existing versions of the WQX data flow. WQX Version 2.2 is 100% backwards compatible with v2.1 and provides expanded data element lengths for various key description text type elements.  See the …View Data Exchange »