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State Implementation Plan (SIP)

Federally enforceable State Implementation Plans
State Air Quality Regulations Web pages
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State Attainment/Maintenance Plans Web pages
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This Web page contains information on the EPA-approved State Implementation Plans (SIP) for Colorado, Montana, North Dakota, South Dakota, Utah, and Wyoming. SIPs typically consist of narratives, or rules, or both. Sometimes SIPs include other forms of requirements such as stipulations, agreements, or permits. See General SIP Requirements. The states prepare SIPs and submit them to EPA for approval to meet specific requirements of the Clean Air Act, including the requirement to attain and maintain the National Ambient Air Quality Standards (NAAQS). SIP narratives describe how the plan, including any rules or other requirements, will comply with these requirements and maintain the NAAQS. SIP narratives also sometimes include state promises for future action, which we call commitments. Once EPA approves a SIP, EPA and citizens may enforce the SIP rules, requirements, and commitments in Federal court.

This Web page includes the EPA-approved SIP rules and requirements for the listed states, along with SIP commitments.

We also provide links to state Web sites (listed to the right) to enable you to view the current state air quality rules. Please note that the air quality rules on these state Web sites may differ from what is contained in our database. This may happen because a state has yet to submit a rule or rule revision to us for approval, or we have not approved a rule or rule revision that a state has submitted. Without our approval, a state’s change to a rule contained in the EPA-approved SIP has no affect on our or citizens’ authority to enforce the EPA-approved rule in Federal court.

This Web page does not include the narrative portion of all SIPs. The fact that SIP narratives may not be included in this database is not intended to alter citizens' or our ability to enforce requirements, if any, contained in those SIP narratives. To review specific SIP narratives not included in this database, please contact us.


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