Company: AWK
Filing Date: 2025-12-17
Form Type: S-4
Source: 0001193125-25-321389
Chunk: 427

Company: American Water Works Company, Inc.
Filing Date: 2025-12-17
Form: S-4
Chunk 427
---
 submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act of 1933 and will be governed by the final     
 adjudication of such issue.                                                                                                                                                                                                                               |

| (e) | The undersigned registrant hereby undertakes to respond to requests for information that is incorporated by                                                                                                  
 reference into the prospectus pursuant to Items 4, 10(b), 11 or 13 of this Form S-4, within one business day of receipt of such request, and to send the incorporated documents by first class mail or other 
 equally prompt means. This includes information contained in documents filed subsequent to the effective date of the registration statement through the date of responding to the request.                   |

| (f) | The undersigned registrant hereby undertakes to supply by means of a post-effective amendment all information                                                               
 concerning a transaction, and the company being acquired involved therein, that was not the subject of and included in the registration statement when it became effective. |

II-7

SIGNATURES Pursuant to the requirements of the Securities Act of 1933, as amended, the registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Camden, State of New Jersey, on the 16th day of December, 2025.

| AMERICAN WATER WORKS COMPANY, INC. |     |                                       |
| By:                                |     | /s/ JOHN C. GRIFFITH                  |
|                                    |     | John C. Griffith                      |
|                                    |     | President and Chief Executive Officer |

POWER OF ATTORNEY KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints John C. Griffith, David M. Bowler, Stacy A. Mitchell and Jeffrey M. Taylor, or any of them, as his, her, or its true and lawful attorneys-in-fact andagents, with full power of substitution and resubstitution, for him or her and in his, her, or its name, place and stead, in any and all capacities, to file and sign any and all amendments to this registration statement, including post-effective amendments, to this registration statement, and any registration statement relating to the offering covered by this registration statement and filed pursuant to Rule 462 under the Securities Act of 1933, as amended, with the U.S. Securities and Exchange Commission, granting unto said attorneys-in