| Date | Comments |
| 5-27-25 | Comments on Modification of Pattison Sand Company Water Use Permit |
| 4-23-25 | Comments to EPA on Waters of the United States Rulemaking |
| 12-13-24 | Comments to EPA on the 2024 List of Iowa Impaired Waters |
| 10-17-24 | Response to CTM Motion for Judgment on the Pleadings |
| 10-2-24 | Motion to Intervene to Defend Swampbuster and Sodbuster |
| 9-24-24 | Iowa DNR Regulatory Analysis – Chapters 71 |
| 9-24-24 | Iowa DNR Regulatory Analysis – Chapter 70 |
| 9-24-24 | Iowa DNR Regulatory Analysis – Chapter 63 |
| 9-24-24 | Iowa DNR Regulatory Analysis – Chapter 60, 64, and 66 |
| 9-24-24 | Iowa DNR Regulatory Analysis – Chapters 40 and 42 |
| 9-24-24 | Iowa DNR Regulatory Analysis – Chapters 38 and 49 |
| 7-17-24 | Comments to the DNR for Water Quality Testing Following Flood Events |
| 5-3-34 | Comments on the Draft NPDES Permit for Interstate Power & Light Ottumwa Generating Station |
| 4-16-24 | Petition for EPA Emergency Action Pursuant to the Safe Drinking Water Act |
| 4-12-24 | MEC Antidegradation Comments |
| 4-4-24 | Comments on the Draft 2024 List of Impaired Waters |
| 2-23-24 | Joint comments on CAFO rules |
| 2-14-24 | Oral comments made at the Public Hearing for Chapter 65 Rules |
| 12-6-23 | Oral comments made at the 38th Public Meeting of the Gulf Hypoxia Task Force |
| 11-29-23 | Written comments submitted for the 38th Public Meeting of the Gulf Hypoxia Task Force |
| 9-26-23 | Joint Comments on the September 2023 CAFO Rules |
| 8-14-23 | Comments on Supreme Beef Nutrient Management Plan |
| 6-23-23 | Comments regarding Iowa DNR rulemaking - Chapter 10 |
| 6-15-23 | Joint Comments on 2023 CAFO Rules |
| 12-8-22 | Comments for the 37th Public Meeting of the Gulf Hypoxia Task Force |
| 11-7-22 | Intent to Withdraw the Nitrate TMDL in the Cedar River Watershed |
| 10-18-22 | Joint Comments on DNR draft rules regulating animal feeding operations |
| 7-8-22 | IEC Comments on the Implementation Plans for the Bipartisan Infrastructure Law funding through the Clean Water and Drinking Water State Revolving Funds |
| 3-18-22 | IEC Comments on Iowa DNR's 2022 303(d) Impaired Waters List |
| 6-30-21 | IEC Comments on DNR Triennial Review |
| 4-2-21 | IEC Comments on 401 Rule Making |
| 3-8-21 | IEC comments on NMP for Supreme Beef, LLC |
| 12-15-20 | IEC comments on Iowa DNR's 2020 303(d) Impaired Waters List |
| 12-10-20 | IEC comments on 2020 Nationwide Permit Certification |
| 11-16-20 | IEC 2020 NWP Regional Conditions Comments |
| 10-23-20 | Comments on 401 Certifications for Permits 40 and 41 |
| 9-11-20 | Comments on 401 certification rule making |
| 3-11-20 | Comments on draft 'Iowa Nutrient Reduction Strategy: 2018-2019 Annual Progress Report |
| 2-22-19 | Comments on Batch #5 Phase 5 Rec UAA |
| 12-20 -19 | Comments on draft 2018 List of Impaired Waters |
| 11-1-18 | Petition by IEC and the Environmental Law and Policy Center for the adoption of rules relating to numeric water quality standards for significant public recreational lakes. Brief in support of petition |
| 3-26-18 | Part 1: Comments on 2018-2020 Triennial Review, Part I: Numeric Nutrient Criteria Appendix A, Appendix B, Appendix C Part 2: Comments on 2018-2020 Triennial Review, Part II: UAAs/Lake Use Designations Appendix A, Appendix B |
| 9-8-17 | Council Comments on Proposed revision of Iowa’s recreational water quality criteria for E. coli |
| 9-8-17 | Recreational Water Quality - Appendix A |
| 9-8-17 | Waters Affected by Proposed Change to Bacteria Water Quality Standards |
| 8-10-16 | Council Comments on Proposed Anti-degradation Amendments - Aug EPC Meeting |
| 6-29-16 | Council Comments on Proposed Anti-degradation Amendments - Public Comments |
| 6-3-16 | Council Comments Opposing Proposed Animal Feeding Operation Rule Changes |
| 5-17-16 | Council Comments on Proposed Anti-degradation Amendments - May EPC Meeting |
| 5-25-16 | Letter to Iowa DNR Re Proposed CAFO in Allamakee County |
| 4-17-15 | Land and Water Conservation Fund Coalition Statement |
| 3-27-15 | Comments on Proposed Rules Regarding Iowa Topsoil Preservation Requirements |
| 2-24-15 | Letter to Gov. Branstad in Support of Protections for Turtles |
| 10-30-13 | Letter Supporting Farm Bill Conservation |
| 8-20-13 | Petition for Numeric Water Quality Standards for Significant Public Recreational Lakes |