UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                    FORM 10-Q/A

(Mark One)

[ X ]    QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                  For the quarterly period ended March 31, 1997

                                       OR

[    ]   TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                         Commission file number 0-16225

                                      EMCON

             (Exact name of Registrant as specified in its charter)


             California                                       94-1738964
 ----------------------------------                      ----------------------
(State or other jurisdiction of                          (I.R.S.Employer
incorporation or organization)                           Identification No.)

400 South El Camino Real, Suite 1200
San Mateo, California                                           94402
- ---------------------------------------                     -------------
(Address of  principal executive offices)                    (Zip Code)


       Registrant's telephone number, including area code: (415) 375-1522

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  registrant  was
required  to file  such  reports),  and  (2) has  been  subject  to such  filing
requirements for the past 90 days. Yes [ X ] No [ ]

8,535,372 shares of Common Stock Issued and Outstanding as of May 13, 1997.