EEI 2017 Form 10-K

Exhibit 23.1 CONSENTOF INDEPENDENTREGISTEREDPUBLICACCOUNTINGFIRM We consent to the incorporation by reference in the Registration Statement (Form S-8 No. 333-30085) pertaining to the Ecology and Environment, Inc. 401(k) Plan of our report dated November 14, 2017, with respect to the consolidated financial statements of Ecology and Environment, Inc. included in this Annual Report (Form 10-K) for the year ended July 31, 2017. /s/ Ernst & Young LLP Buffalo, New York November 14, 2017