Company: AWK
Filing Date: 2025-12-29
Form Type: S-4/A
Source: 0001193125-25-332292
Chunk: 421

Company: American Water Works Company, Inc.
Filing Date: 2025-12-29
Form: S-4/A
Chunk 421
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 officer or controlling person of    
 the registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the registrant will, unless in the opinion of its counsel the 
 matter has been settled by controlling precedent, 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 29th day of December, 2025.

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

Pursuant to the requirements of the Securities Act of 1933, as amended, this registration statement has been signed by the following persons in the capacities and on the dates indicated.

| Name                 
 John C. Griffith     |     | Title                                                
 /s/ JOHN C. GRIFFITH                                 |     | Date              
 December 29, 2025 |
|:---------------------|:----|:-----------------------------------------------------|:----|:------------------|
|                      |     | President and Chief Executive Officer                
 (Principal Executive Officer) and Director