<ARTICLE> 5 <CIK> 0000822818 <NAME> CLEAN HARBORS, INC. <MULTIPLIER> 1,000 <PERIOD-TYPE> YEAR <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-END> DEC-31-1997 <CASH> 3,935 <SECURITIES> 1,088 <RECEIVABLES> 38,886 <ALLOWANCES> (1,050) <INVENTORY> 2,811 <CURRENT-ASSETS> 50,438 <PP&E> 128,299 <DEPRECIATION> 66,392 <TOTAL-ASSETS> 154,945 <CURRENT-LIABILITIES> 38,679 <BONDS> 68,020 <PREFERRED-MANDATORY> 0 <PREFERRED> 1 <COMMON> 101 <OTHER-SE> 39,922 <TOTAL-LIABILITY-AND-EQUITY> 154,945 <SALES> 183,767 <TOTAL-REVENUES> 183,767 <CGS> 140,542 <TOTAL-COSTS> 140,542 <OTHER-EXPENSES> (800) <LOSS-PROVISION> 683 <INTEREST-EXPENSE> 9,182 <INCOME-PRETAX> (8,883) <INCOME-TAX> 4,845 <INCOME-CONTINUING> (13,728) <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> (13,728) <EPS-PRIMARY> 1.42 <EPS-DILUTED> 1.42