| Exhibit Number | | | | | | Exhibit Description | | |
| 3.1 | | | | | | Restated Certificate of Incorporation of American Water Works Company, Inc. (incorporated by reference to Exhibit 3.1 to American Water Works Company, Inc.’s Quarterly Report on Form 10-Q, File No. 001-34028, filed November 6, 2008). | | |
| 3.2 | | | | | | Amended and Restated Bylaws of American Water Works Company, Inc. (incorporated by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K, File No. 001-34028, filed December 10, 2020). | | |
| 4.1 | | | | | | Indenture, dated as of December 4, 2009, between American Water Capital Corp. and Wells Fargo Bank, National Association (incorporated by reference to Exhibit 4.1 to American Water Works Company, Inc.’s Current Report on Form 8-K, File No. 001-34028, filed December 3, 2010). | | |
| 4.2 | | | | | | Officers’ Certificate of American Water Capital Corp., dated May 5, 2022, establishing the terms and authorizing the issuance of the 4.450% Senior Notes due 2032 (incorporated by reference to Exhibit 4.1 to American Water Works Company, Inc.’s Current Report on Form 8-K, File No. 001-34028, filed May 5, 2022). | | |
| *10.1 | | | | | | Offer Letter for Employment, dated April 27, 2022, between American Water Works Company, Inc. and John C. Griffith. | | |
| *10.2 | | | | | | American Water Works Company, Inc. 2017 Omnibus Equity Compensation Plan 2022 Stock Unit Grant Form for Non-Employee Directors. | | |
| *22.1 | | | | | | Guaranteed Securities. | | |
| *31.1 | | | | | | Certification of M. Susan Hardwick, President and Chief Executive Officer, pursuant to Section 302 of the Sarbanes-Oxley Act. | | |
| *31.2 | | | | | | Certification of John C. Griffith, Executive Vice President and Chief Financial Officer, pursuant to Section 302 of the Sarbanes-Oxley Act. | | |
| **32.1 | | | | | | Certification of M. Susan Hardwick, President and Chief Executive Officer, pursuant to Section 906 of the Sarbanes-Oxley Act. | | |
| **32.2 | | | | | | Certification of John C. Griffith, Executive Vice President and Chief Financial Officer, pursuant to Section 906 of the Sarbanes-Oxley Act. | | |
| 101.INS | | | | | | XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document. | | |
| 101.SCH | | | | | | Inline XBRL Taxonomy Extension Schema Document. | | |
| 101.CAL | | | | | | Inline XBRL Taxonomy Extension Calculation Linkbase Document. | | |
| 101.DEF | | | | | | Inline XBRL Taxonomy Extension Definition Linkbase Document. | | |
| 101.LAB | | | | | | Inline XBRL Taxonomy Extension Label Linkbase Document. | | |
| 101.PRE | | | | | | Inline XBRL Taxonomy Extension Presentation Linkbase Document. | | |
| 104 | | | | | | Cover Page Interactive Data File (formatted as Inline XBRL with applicable taxonomy extension information contained in Exhibits 101). | | |