NPDES Permit for Maher Cattle Company in South Dakota

Under National Pollutant Discharge Elimination System permit number SD-0034768, the Maher Cattle Company is authorized to discharge and must operate their facility in accordance with effluent limitations, monitoring requirements, and other provisions set forth herein. The facility is located on the Standing Rock Indian Reservation in Corson County, South Dakota.

• Learn more about the EPA's action at the Maher Cattle Company

Current Permit

• SD-0034768 Maher Cattle Company NPDES Permit (pdf) (684.64 KB, April 1, 2026)
• SD-0034768 Maher Cattle Company NPDES Permit - Appendix A (pdf) (235.03 MB, August 27, 2025)
• SD-0034768 Maher Cattle Company NPDES Permit - Appendix B (pdf) (1.49 MB, August 26, 2025)
• SD-0034768 Maher Cattle Company NPDES Permit - Appendix C (pdf) (441.4 KB, August 26, 2025)
• SD-0034768 Maher Cattle Company Statement of Basis (pdf) (1.34 MB, April 1, 2026)

Environmental Assessment/Finding of No Significant Impact

As part of the NPDES permitting process, the EPA also completed an environmental assessment and a finding of no significant impact. Documents related to this process are included below.

• Finding of No Significant Impact - Maher Cattle Company (pdf) (223.43 KB, April 1, 2026)
• EPA's Response to Comments on the Preliminary FONSI - Maher Cattle Company (pdf) (576.16 KB, April 1, 2026)
• Environmental Assessment - Maher Cattle Company - Final (pdf) (2.48 MB, December 1, 2025)
• Appendix A - NRCS National Conservation Practice Standard for Prescribed Grazing Code 528 (PDF) (121.73 KB, December 1, 2025)
• Appendix B - Administrative Compliance Order on Consent 05.07.2024_CWA_08-2024-0005 (pdf) (4.19 MB, December 1, 2025)
• Appendix C - Maher Inspection Report 07.14.2022 (pdf) (3.4 MB, December 1, 2025)
• Appendix D - Maher Sampling Inspection Report 06.27.2023 (pdf) (3.7 MB, December 1, 2025)
• Appendix E - EPA Response to Comments Received During Public Notice (pdf) (1 MB, December 1, 2025)