Exhibit 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos. 333-142527, 333-159971, 333-154711, 333-173779, 333-66714, 333-66712, 333-134251, 333-134252 and 333-190315) of Aegion Corporation of our report dated February 28, 2014, relating to the financial statements and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/PricewaterhouseCoopers LLP

St. Louis, Missouri

February 28, 2014