An official website of the United States government.

We've made some changes to If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Surface Water / GWUDISW Change Form

This checklist includes all materials which should be completed and submitted to EPA Region 8 when a Wyoming or Tribal Public Water System using Surface Water or GWUDISW (a Subpart H System) is making a change to treatment or building a new treatment plant.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.