<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.

<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