| 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). | | |
| *10.1 | | | | | | American Water Works Company, Inc. 2017 Omnibus Equity Compensation Plan 2022 Restricted Stock Unit Grant. | | |
| *10.2 | | | | | | American Water Works Company, Inc. 2017 Omnibus Equity Compensation Plan 2022 Restricted Stock Unit Grant (for M. Susan Hardwick). | | |
| *10.3 | | | | | | American Water Works Company, Inc. 2017 Omnibus Equity Compensation Plan 2022 Restricted Stock Unit Grant (for Cheryl Norton). | | |
| *10.4 | | | | | | American Water Works Company, Inc. 2017 Omnibus Equity Compensation Plan 2022 Performance Stock Unit Grant Form A. | | |
| *10.5 | | | | | | American Water Works Company, Inc. 2017 Omnibus Equity Compensation Plan 2022 Performance Stock Unit Grant Form A (for M. Susan Hardwick). | | |
| *10.6 | | | | | | American Water Works Company, Inc. 2017 Omnibus Equity Compensation Plan 2022 Performance Stock Unit Grant Form A (for Cheryl Norton). | | |
| *10.7 | | | | | | American Water Works Company, Inc. 2017 Omnibus Equity Compensation Plan 2022 Performance Stock Unit Grant Form B. | | |
| *10.8 | | | | | | American Water Works Company, Inc. 2017 Omnibus Equity Compensation Plan 2022 Performance Stock Unit Grant Form B (for M. Susan Hardwick). | | |
| *10.9 | | | | | | American Water Works Company, Inc. 2017 Omnibus Equity Compensation Plan 2022 Performance Stock Unit Grant Form B (for Cheryl Norton). | | |
| 10.10 | | | | | | Offer Letter for Employment, dated as of February 2, 2022, between American Water Works Company, Inc. and M. Susan Hardwick (incorporated by reference to Exhibit 10.3 to American Water Works Company, Inc.’s Annual Report on Form 10-K, File No. 001-34028, filed February 16, 2022). | | |
| *10.11 | | | | | | Offer Letter for Employment, dated January 21, 2022, between American Water Works Company, Inc. and James H. Gallegos. | | |
| 10.12 | | | | | | Separation Agreement and General Release, dated as of February 2, 2022, between American Water Works Service Company, Inc. and Walter J. Lynch (incorporated by reference to Exhibit 10.7 to American Water Works Company, Inc.’s Annual Report on Form 10-K, File No. 001-34028, filed February 16, 2022). | | |
| 22.1 | | | | | | Guaranteed Securities (incorporated by reference to Exhibit 22.1 to American Water Works Company, Inc.’s Registration Statement on Form S-3, File No. 333-263068, filed February 28, 2022). | | |
| *31.1 | | | | | | Certification of M. Susan Hardwick, President, Chief Executive Officer and Chief Financial Officer, pursuant to Section 302 of the Sarbanes-Oxley Act. | | |
| **32.1 | | | | | | Certification of M. Susan Hardwick, President, Chief Executive Officer 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). | | |
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