The SO₂ Data Requirements Rule (DRR) required agencies to notify EPA of their selected approach, or "pathway," for characterizing air quality around each SO₂ source subject the DRR by July 1, 2016. The DRR provided air agencies with the following four pathways:

• submit air quality modeling;
• conduct air quality monitoring;
• adopt federally enforceable emission limits for a source to reduce emissions below 2,000 tpy, unless further air quality characterization is required in the judgment of the air agency or EPA; or,
• submit documentation that a source has permanently shut down by January 13, 2017;

Below are links to state submittals to meet the DRR pathway notification requirement and EPA response documents. In some cases, in addition to the pathway notification letters, the files below may include modeling protocols, monitoring plans or other information submitted by the state.

The "DRR Source List with Pathway Notification and State Submittal" file is a summary table of state submittals to meet the DRR pathway notification requirement and modeling, monitoring, emissions limit, and shut down information submitted by the states prior to January 13, 2017. This table was originally posted in September 2016 and has been updated to reflect materials submitted to EPA  as of March 2017. 

For questions concerning a state’s pathway notification submittal, please contact the respective EPA regional office. Contact information is available in the "EPA SO₂ Regional Modeling Contacts" file below.

• DRR Source List with Pathway Notification and State Submittal (PDF)(12 pp, 315 K, March 9. 2017)
• EPA SO2 Regional Modeling Contacts (PDF)(1 pg, 228 K)
• Alabama Source Characterization Submittal (PDF)(3 pp, 2 MB)
• Alabama Source Characterization Submittal Update (PDF)(2 pp, 844 K, December 15, 2016)
• EPA Response to Alabama Source Characterization Submittal Update (PDF)(1 pg, 206 K, December 16, 2016)
• Arizona Source Characterization Submittal (PDF)(2 pp, 70 K)
• Arkansas Source Characterization Submittal 1 (PDF)(11 pp, 2 MB)
• Arkansas Source Characterization Submittal 2 (PDF)(10 pp, 2 MB)
• California Source Characterization Submittal (PDF)(3 pp, 684 K)
• Colorado Source Characterization Submittal (PDF)(2 pp, 987 K)
• Connecticut Source Characterization Submittal (PDF)(1 pg, 71 K)
• Florida Source Characterization Submittal (PDF)(5 pp, 387 K)
• Georgia Source Characterization Submittal (PDF)(2 pp, 99 K)
• Guam Source Characterization Submittal (PDF)(1 pg, 78 K)
• Hawaii Source Characterization Submittal (PDF)(1 pg, 108 K)
• Illinois Source Characterization Submittal (PDF)(2 pp, 288 K)
• Indiana Source Characterization Submittal (PDF)(104 pp, 8 MB)
• Iowa Source Characterization Submittal (PDF)(3 pp, 3 MB)
• Kansas Source Characterization Submittal (PDF)(19 pp, 9 MB)
• Kentucky Source Characterization Submittal (PDF)(2 pp, 61 K)
• Louisiana Source Characterization Submittal (PDF)(57 pp, 12 MB)
• Louisiana Source Characterization Submittal Update (PDF)(2 pp, 756 K, January 3, 2017)
• Louisiana Source Characterization Submittal Update - Appendix A (PDF)(23 pp, 3 MB)
• Louisiana Source Characterization Submittal Update - Appendix B (PDF)(33 pp, 7 MB)
• Maine Source Characterization Submittal (PDF)(2 pp, 4 MB)
• Maryland Source Characterization Submittal (PDF)(2 pp, 515 K)
• Michigan Source Characterization Submittal (PDF)(1 pg, 63 K)
• Minnesota Source Characterization Submittal (PDF)(2 pp, 1 MB)
• Mississippi Source Characterization Submittal (PDF)(2 pp, 108 K)
• Mississippi Source Characterization Submittal Update (PDF)(1 pg, 37 K, December 15, 2016)
• EPA Response to Mississippi Source Characterization Submittal Update (PDF)(1 pg, 189 K, December 16, 2016)
• Missouri Source Characterization Submittal (PDF)(3 pp, 1 MB)
• Montana Source Characterization Submittal (PDF)(1 pg, 615 K)
• Navajo Nation Source Characterization Submittal (PDF)(2 pp, 999 K)
• Nebraska Source Characterization Submittal (PDF)(3 pp, 144 K)
• Nevada Source Characterization Submittal (PDF)(2 pp, 92 K)
• New Hampshire Source Characterization Submittal (PDF)(2 pp, 354 K)
• New Mexico Source Characterization Submittal (PDF)(2 pp, 237 K)
• New York Source Characterization Submittal (PDF)(2 pp, 1 MB)
• North Carolina Source Characterization Submittal (PDF)(3 pp, 156 K)
• North Carolina Source Characterization Submittal Update (PDF)(1 pg, 842 K, December 28, 2016)
• EPA Response to North Carolina Source Characterization Submittal Update (PDF)(1 pg, 208 K)
• North Dakota Source Characterization Submittal (PDF)(2 pp, 85 K)
• Ohio Source Characterization Submittal (PDF)(22 pp, 9 MB)
• Oklahoma Source Characterization Submittal (PDF)(4 pp, 1 MB)
• Oregon Source Characterization Submittal (PDF)(1 pg, 68 K)
• Pennsylvania Source Characterization Submittal (PDF)(3 pp, 1 MB)
• Pennsylvania Source Characterization Submittal Update (PDF)(1 pg, 301 K, December 14, 2016)
• EPA Response to Pennsylvania Source Characterization Submittal Update (PDF)(1 pg, 237 K, January 10, 2017)
• Puerto Rico Source Characterization Submittal (PDF)(2 pp, 1 MB)
• South Carolina Source Characterization Submittal (PDF)(4 pp, 991 K)
• Tennessee Source Characterization Submittal (PDF)(5 pp, 309 K)
• Texas Source Characterization Submittal (PDF)(2 pp, 74 K)
• Utah Source Characterization Submittal (PDF)(2 pp, 95 K)
• Virginia Source Characterization Submittal (PDF)(2 pp, 696 K)
• Washington Source Characterization Submittal (PDF)(2 pp, 450 K)
• West Virginia Source Characterization Submittal (PDF)(2 pp, 404 K)
• Wisconsin Source Characterization Submittal (PDF)(2 pp, 635 K)
• Wyoming Source Characterization Submittal (PDF)(6 pp, 2 MB)