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                                                               Exhibit 11

                     CLEAN HARBORS, INC. AND SUBSIDIARIES


                      COMPUTATION OF NET INCOME PER SHARE
          FOR THE THIRD QUARTER ENDED MARCH 31, 1997 & MARCH 31, 1996
                                (in thousands)


                                                         THREE MONTHS ENDED
                                                              MARCH 31,
                                                       ----------------------
                                                         1997           1996
                                                       -------        -------
                                                                     
Net loss                                               $(1,983)       $(1,642)
   Less preferred dividends accrued                        112            112
                                                       -------        -------
Adjusted net loss                                       (2,095)        (1,754)
                                                       =======        =======
Loss per common and common equivalent share:                        
                                                                    
   Weighted average number of                                       
      shares outstanding                                 9,817          9,560
                                                                    
   Incremental shares for stock options                             
      under treasury stock method                           --             --
                                                       -------        -------
   Weighted average number of common and                            
      common equivalent shares outstanding               9,817          9,560
                                                       =======        =======
   Net loss per common and common equivalent share     $  (.21)       $  (.18)
                                                       =======        =======
                                                                    
Loss per common and common equivalent                               
   share - assuming full dilution:                                  
                                                                    
   Weighted average number of                                       
      shares outstanding                                 9,817          9,560
                                                                    
   Incremental shares for stock options                             
      under treasury stock method                           --             --
                                                       -------        -------
   Weighted average number of common                                
      and common equivalent shares                                  
      outstanding - assuming full dilution               9,817          9,560
                                                       =======        =======
   Net loss per common and common equivalent                        
      share - assuming full dilution                   $  (.21)       $  (.18)
                                                       =======        =======