<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED CONDENSED FINANCIAL STATEMENTS OF CLEAN HARBORS, INC. AMENDED FOR
THE THIRD QUARTER ENDED SEPTEMBER 30, 1994 AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLAR
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1994
<PERIOD-START>                             JAN-01-1994
<PERIOD-END>                               SEP-30-1994
<EXCHANGE-RATE>                                      1
<CASH>                                             929
<SECURITIES>                                         0
<RECEIVABLES>                                   47,763
<ALLOWANCES>                                     1,571
<INVENTORY>                                      2,607
<CURRENT-ASSETS>                                52,657
<PP&E>                                         117,912
<DEPRECIATION>                                  46,907
<TOTAL-ASSETS>                                 162,032
<CURRENT-LIABILITIES>                           29,278
<BONDS>                                         62,483
<COMMON>                                            95
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          1
<OTHER-SE>                                      68,690
<TOTAL-LIABILITY-AND-EQUITY>                   162,032
<SALES>                                        154,226
<TOTAL-REVENUES>                               154,226
<CGS>                                          106,764
<TOTAL-COSTS>                                  106,764
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               5,528
<INCOME-PRETAX>                                  5,335
<INCOME-TAX>                                     2,405
<INCOME-CONTINUING>                              2,930
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                  1,220
<CHANGES>                                            0
<NET-INCOME>                                     1,710
<EPS-PRIMARY>                                      .14
<EPS-DILUTED>                                        0