<ARTICLE> 5 <LEGEND> THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE CONSOLIDATED FINANCIAL STATEMENTS OF CLEAN HARBORS, INC. AND SUBSIDIARIES FOR THE QUARTER ENDED MARCH 31, 2000, AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS. </LEGEND> <CIK> 0000822818 <NAME> CLEAN HARBORS <MULTIPLIER> 1,000 <PERIOD-TYPE> 3-MOS <FISCAL-YEAR-END> DEC-31-1999 <PERIOD-START> JAN-01-2000 <PERIOD-END> MAR-31-2000 <CASH> 4,589 <SECURITIES> 1,346 <RECEIVABLES> 47,793 <ALLOWANCES> 1,182 <INVENTORY> 2,861 <CURRENT-ASSETS> 56,835 <PP&E> 139,419 <DEPRECIATION> 82,869 <TOTAL-ASSETS> 150,265 <CURRENT-LIABILITIES> 42,666 <BONDS> 73,446 <PREFERRED-MANDATORY> 0 <PREFERRED> 1 <COMMON> 110 <OTHER-SE> 32,763 <TOTAL-LIABILITY-AND-EQUITY> 150,265 <SALES> 0 <TOTAL-REVENUES> 52,737 <CGS> 0 <TOTAL-COSTS> 39,109 <OTHER-EXPENSES> 12,519 <LOSS-PROVISION> 171 <INTEREST-EXPENSE> 2,288 <INCOME-PRETAX> (1,350) <INCOME-TAX> 90 <INCOME-CONTINUING> (1,440) <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> (1,440) <EPS-BASIC> $(0.14) <EPS-DILUTED> $(0.14)