<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM CLEAN
HARBORS, INC. FORM 10-Q DATED SEPTEMBER 30, 2000 AS FILED WITH THE SECURITIES
AND EXCHANGE COMMISSION AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.

<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               SEP-30-2000
<CASH>                                           1,118
<SECURITIES>                                       504
<RECEIVABLES>                                   51,831
<ALLOWANCES>                                     1,368
<INVENTORY>                                      2,860
<CURRENT-ASSETS>                                56,921
<PP&E>                                         143,243
<DEPRECIATION>                                  87,121
<TOTAL-ASSETS>                                 149,165
<CURRENT-LIABILITIES>                           92,456
<BONDS>                                         16,808
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          1
<COMMON>                                           111
<OTHER-SE>                                      38,459
<TOTAL-LIABILITY-AND-EQUITY>                   149,165
<SALES>                                              0
<TOTAL-REVENUES>                               175,269
<CGS>                                                0
<TOTAL-COSTS>                                  124,289
<OTHER-EXPENSES>                                39,069
<LOSS-PROVISION>                                   513
<INTEREST-EXPENSE>                               6,998
<INCOME-PRETAX>                                  4,400
<INCOME-TAX>                                       294
<INCOME-CONTINUING>                              4,106
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     4,106
<EPS-BASIC>                                       0.34
<EPS-DILUTED>                                     0.33