Siouxland Subarea

31 counties surrounding Sioux City, IA - Region VII


Site Contact:

Megan Schuette

31 counties surrounding Sioux City, IA 51101

Latitude: 42.3998828
Longitude: -96.3284683

The Siouxland Subarea is a collaborative effort of federal and state agencies, emergency managers, tribes, and local emergency responders within the geographic area surrounding the Missouri River and its tributaries from river mile marker 860 to 642. Planning and outreach activities were initiated by EPA Region 7 and partner agencies to facilitate a timely, effective, and cooperative response to a discharge of oil or release of hazardous substances that may pose a threat to public health and sensitive environments within the Sub-Area.

To guide these efforts, the Siouxland Subarea Contingency Plan was developed to coordinate the response to a substantial discharge or threat of a discharge through integrating the actions of the unique combination of private industry and local, state and federal entities that have jurisdiction within the Sub-Area. The Siouxland Subarea includes the following counties and tribal entities:

Iowa: Buena Vista, Cherokee, Clay, Dickinson, Harrison, Ida, Lyon, Monona, O’Brien, Osceola, Plymouth, Pocahontas, Sioux, and Woodbury Counties

Minnesota: Lyon, Jackson, Nobles, Pipestone, and Rock Counties

Nebraska: Burt, Cedar, Dakota, Dixon, Knox, Thurston, and Wayne Counties, as well as the Omaha Tribe of Nebraska, Ponca Tribe of Nebraska, Winnebago Tribe of Nebraska, and Santee Sioux Nation of Nebraska

South Dakota: Clay, Lincoln, Minnehaha, Union, and Yankton Counties

Our vision is to ensure the readiness of all responders in this jurisdictionally complex area to better prepare for discharges of oil, releases of hazardous substances, and to protect the public and the environment from impacts.

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NOTE: You only need to follow this registration process (Step 1) once, but you will still need to contact each OSC for the states you want access to individually (Steps 2-3). If you have never accessed a resource on, you will be redirected to your profile page on your first login attempt. Simply go back in your browser and click the link again.

  • 1. After pressing the button above, go to your Inbox and check for an email message from to confirm your account by following the link provided in that message. You have 48 hours to do this!.
  • 2. Then, send an email message with your request to Megan Schuette ( and provide a description of why you want access to this resource, including your first name, last name, email address, organization, and phone number.
  • 3. Once you receive communication from Megan Schuette (, return to this Web page, and click the button below to open the map.