Outstanding International Resource Waters

All surface waters of the Lake Superior basin that are not identified as Outstanding State Resource Waters (OSRWs) are designated as Lake Superior basin - outstanding international resource waters (LSBOIRW). Under the LSB-OIRW designation, new or increased loadings from point sources to the surface waters of the Lake Superior basin are prohibited unless the new or increased loading is consistent with the requirements of Part 31, Water Resources Protection, of the Natural Resources and Environmental Protection Act (NREPA)1994 PA 451, and specifically Rule 98 of Part 4, Water Quality Standards (WQS), promulgated under Part 31 of the NREPA.