An official website of the United States government.

We've made some changes to EPA.gov. 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.

Approved Air Quality Implementation Plans in Region 8

Colorado, Montana, North Dakota, South Dakota, Utah, Wyoming and Tribal Nations

Use the tabs below to find approved State Implementation Plans (SIPs), Tribal Implementation Plans (TIPs), and Federal Implementation Plans (FIPs) within EPA Region 8 states listed above.

State Implementation Plans

Approved regulations, sources specific requirements, and non-regulatory provisions.

EPA-approved regulations and planning documents.  

Tribal Implementation Plans

Region 8 currently has no approved TIPs.

Federal Implementation Plans

The following links exit the site Exit

Fort Berthold Indian Reservation (Madan, Hidatsa, and Arikara Nations)