Company: AWK
Filing Date: 2025-02-27
Form Type: S-3ASR
Source: 0001410636-25-000050
Chunk: 28

Company: American Water Works Company, Inc.
Filing Date: 2025-02-27
Form: S-3ASR
Chunk 28
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center'>II-6</div>

### POWER OF ATTORNEY
Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed by the following persons in the capacities and on the dates indicated.

Each person in so signing also makes, constitutes and appoints M. Susan Hardwick, David M. Bowler and Jeffrey M. Taylor, and each of them acting alone, his or her true and lawful attorney-in-fact, with full power of substitution, to do any and all acts and things in his or her name and on his or her behalf in his or her capacity as a director and/or officer and to execute any and all documents for him or her in such capacity, which said attorneys and agents, or any of them, may deem necessary or advisable to enable the registrant to comply with the Securities Act of 1933, as amended, and any rules, regulations and requirements of the Securities and Exchange Commission in connection with this Registration Statement, including, without limitation, the execution and filing with the Securities and Exchange Commission of any and all amendments and post-effective amendments to this Registration Statement, with exhibits thereto and other documents in connection therewith, and hereby ratifies and confirms all that said attorney-in-fact or his or her substitute or substitutes may do or cause to be done by virtue hereof.

| Signature                
 /s/ M. SUSAN HARDWICK    |     | Title                                                                              
 Chief Executive Officer (Principal Executive Officer and Director)                 |     | Date              
 February 27, 2025 |
|:-------------------------|:----|:-----------------------------------------------------------------------------------|:----|:------------------|
| M. Susan Hardwick        |     |                                                                                    |     |                   |
| /s/ DAVID M. BOWLER      |     | Executive Vice President and Chief Financial Officer (Principal Financial Officer) |     | February 27, 2025 |
| David M. Bowler          |     |                                                                                    |     |                   |
| /s/ MELISSA K. WIKLE     |     | Senior Vice President, Chief Accounting Officer                                    
 (Principal Accounting Officer)                                                     |     | February 27, 2025 |
| Melissa K. Wikle         |     |                                                                                    |     |                   |
| /s/ JEFFREY N. EDWARDS   |     | Director                                                                           |     | February 27, 2025 |
| Jeffrey N. Edwards       |     |                                                                                    |     |                   |
| /