| 
        
          |  | Region |  |  
          | Amendment Type | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | Total |  
          | Use Attainability Analyses | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |  
          | Water Quality Objectives | 1 | 1 | 0 | 0 | 4 | 0 | 0 | 0 | 0 | 6 |  
          | TMDLs | 1 | 1 | 0 | 1 | 1 | 0 | 1 | 0 | 1 | 6 |  
          | Implementation Provisions | 34 | 21 | 0 | 31 | 20 | 0 | 9 | 0 | 21 | 136 |  
          | Prohibitions | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 3 |  
          | Non-Regulatory | 0 | 1 | 1 | 0 | 2 | 1 | 0 | 0 | 0 | 5 |  
          | Total by Region | 37 | 24 | 1 | 33 | 27 | 1 | 10 | 0 | 23 | 156 |  |  |