<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)