EXHIBIT 11
 
                     CLEAN HARBORS, INC. AND SUBSIDIARIES
 
                  COMPUTATION OF NET INCOME (LOSS) PER SHARE
 
                  FOR THE THREE YEARS ENDED DECEMBER 31, 1995
                    (IN THOUSANDS EXCEPT PER SHARE AMOUNTS)
 


                                                                        FULLY
      TYPE OF SECURITY                                        PRIMARY  DILUTED
      ----------------                                        -------  -------
                                                                 
1993
Weighted average common stock outstanding in 1993............   9,327    9,327
Stock options exercised in 1993..............................      82       82
Stock options and warrants outstanding during 1993...........     475      475
                                                              -------  -------
Weighted average shares of common stock outstanding..........   9,884    9,884
                                                              =======  =======
Net income................................................... $ 3,131  $ 3,131
Less preferred stock dividends accrued.......................     350      350
                                                              -------  -------
Adjusted net income.......................................... $ 2,781  $ 2,781
                                                              =======  =======
Earnings per share........................................... $   .28  $   .28
                                                              =======  =======
1994
Weighted average common stock outstanding in 1994............   9,426    9,426
Stock options exercised in 1994..............................       4        4
Stock options and warrants outstanding during 1994...........     205      205
                                                              -------  -------
Weighted average shares of common stock outstanding..........   9,635    9,635
                                                              =======  =======
Net income................................................... $   475  $   475
Less preferred stock dividends accrued.......................     441      441
                                                              -------  -------
Adjusted net income.......................................... $    34  $    34
                                                              =======  =======
Earnings per share........................................... $   .00  $   .00
1995
Weighted average common stock outstanding in 1995............   9,457    9,457
Stock options exercised in 1995..............................       3        3
Stock options and warrants outstanding during 1995...........      15       15
                                                              -------  -------
Weighted average shares of common stock outstanding..........   9,475    9,475
                                                              =======  =======
Net loss..................................................... $(6,893) $(6,893)
Less preferred stock dividends accrued.......................     447      447
                                                              -------  -------
Adjusted net loss............................................ $(7,340) $(7,340)
                                                              =======  =======
Loss per share............................................... $  (.77) $  (.77)
                                                              =======  =======