On December 30, 2021, Brian R. Hoesterey provided Evoqua Water Technologies Corp. notice of his decision to resign from the Board of Directors of the Company, effective December 31, 2021. On December 30, 2021, the Board approved a reduction in the size of the Board from ten to nine directors and a reduction in the number of Class III directors from three to two directors, effective December 31, 2021, following the effective time of Mr. Hoesterey's resignation.