EXHIBIT 15

April 29, 2022

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The Board of Directors and Stockholders of US Ecology, Inc.

101 S. Capitol Blvd. Suite #1000

Boise, Idaho 83702

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We are aware that our report dated April 29, 2022 on our review of the interim financial information of US Ecology, Inc. appearing in this Quarterly Report on Form 10-Q for the quarter ended March 31, 2022, is incorporated by reference in Registration Statement Nos. 333-261704, 333-235835 and 333-234424 on Form S-8 filed by US Ecology, Inc., Registration Statement No. 333-235824 on Form S-3 filed by US Ecology Inc. and Registration Statement No. 333-232930 on Form S-4 filed by US Ecology Parent Inc.

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/s/ Deloitte & Touche LLP

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Boise, Idaho