<ARTICLE>      5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THERMO
TERRATECH INC.'S REPORT ON FORM 10-Q FOR THE PERIOD ENDED JULY 4, 1998 AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER>   1,000
       
                     
<PERIOD-TYPE>                    3-MOS
<FISCAL-YEAR-END>                APR-03-1999
<PERIOD-END>                     JUL-04-1998
<CASH>                                27,596
<SECURITIES>                           1,998
<RECEIVABLES>                         64,116
<ALLOWANCES>                           4,567
<INVENTORY>                            1,486
<CURRENT-ASSETS>                     124,480
<PP&E>                               149,098
<DEPRECIATION>                        53,492
<TOTAL-ASSETS>                       345,298
<CURRENT-LIABILITIES>                 57,030
<BONDS>                              150,111
<PREFERRED-MANDATORY>                      0
<PREFERRED>                                0
<COMMON>                               1,958
<OTHER-SE>                            97,018
<TOTAL-LIABILITY-AND-EQUITY>         345,298
<SALES>                                    0
<TOTAL-REVENUES>                      76,693
<CGS>                                      0
<TOTAL-COSTS>                         61,045
<OTHER-EXPENSES>                         145
<LOSS-PROVISION>                         363
<INTEREST-EXPENSE>                     2,257
<INCOME-PRETAX>                        2,460
<INCOME-TAX>                           1,299
<INCOME-CONTINUING>                    1,001
<DISCONTINUED>                             0
<EXTRAORDINARY>                            0
<CHANGES>                                  0
<NET-INCOME>                           1,001
<EPS-PRIMARY>                           0.05
<EPS-DILUTED>                           0.05