American Water Works (AWK) 10-K2020 FY Annual report

Consent of Independent Registered Public Accounting Firm

We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos. 333-235598, 333-219682, 333-217975, 333-168543 and 333-150381) and Form S-3 (Nos. 333-229994 and 333-224558) of American Water Works Company, Inc. of our report dated February 24, 2021 relating to the financial statements and the effectiveness of internal control over financial reporting, which appears in this Form 10‑K.