X0306 4/A 2022-01-14 2022-01-18 0001783400 US Ecology, Inc. ECOL 0001272449 WELLING STEVEN D 101 S. CAPITOL BLVD. SUITE 1000 BOISE ID 83702 1 EVP Sales & Marketing Common Stock 2022-01-14 4 F 0 379 31.90 D 47533 D The amendment is being filed to amend the disclosure in Table I Column 4 in the Form 4 previously filed on January 18, 2022, by the reporting person, in order to disclose the withholding of an additional 42 shares due to an adjustment related to the tax withholding originally reported on January 18, 2022. /s/ Wayne Ipsen, by Power of Attorney 2022-01-26