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<PAGE> Exhibit 23.1 CONSENT OF INDEPENDENT AUDITORS We consent to the incorporation by reference in this Registration Statement on Form S-8 of Envirogen, Inc. of our report dated February 15, 2000, with respect to the consolidated financial statements and financial statement schedule of Envirogen, Inc. included in its Annual Report (Form 10-K) for the year ended December 31, 1999, filed with the Securities and Exchange Commission. Ernst & Young LLP Metro Park, New Jersey June 12, 2000 -9-
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