<ARTICLE> 5 <LEGEND> THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE FINANCIAL STATEMENTS OF CLEAN HARBORS, INC. FOR THE SIX MONTH PERIOD ENDED JUNE 30, 2000. </LEGEND> <CIK> 0000822818 <NAME> CLEAN HARBORS, INC. <MULTIPLIER> 1,000 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-1999 <PERIOD-START> JAN-01-2000 <PERIOD-END> JUN-30-2000 <CASH> 3,096 <SECURITIES> 1,658 <RECEIVABLES> 52,495 <ALLOWANCES> 1,293 <INVENTORY> 2,873 <CURRENT-ASSETS> 60,645 <PP&E> 142,236 <DEPRECIATION> 85,074 <TOTAL-ASSETS> 154,231 <CURRENT-LIABILITIES> 92,817 <BONDS> 23,561 <PREFERRED-MANDATORY> 0 <PREFERRED> 1 <COMMON> 111 <OTHER-SE> 36,438 <TOTAL-LIABILITY-AND-EQUITY> 154,231 <SALES> 0 <TOTAL-REVENUES> 114,979 <CGS> 0 <TOTAL-COSTS> 81,904 <OTHER-EXPENSES> 25,701 <LOSS-PROVISION> 342 <INTEREST-EXPENSE> 4,603 <INCOME-PRETAX> 2,429 <INCOME-TAX> 230 <INCOME-CONTINUING> 2,199 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 2,199 <EPS-BASIC> 0.18 <EPS-DILUTED> 0.18