Company: AWK
Filing Date: 2025-02-27
Form Type: S-3ASR
Source: 0001410636-25-000050
Chunk: 0

Company: American Water Works Company, Inc.
Filing Date: 2025-02-27
Form: S-3ASR
Chunk 0
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<div align='center'>As filed with the Securities and Exchange Commission on February 27, 2025</div>

#### Registration No. 333- ______

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### FORM S-3

### REGISTRATION STATEMENT

#### UNDER
THE SECURITIES ACT OF 1933

#### AMERICAN WATER WORKS COMPANY, INC.
<div align='center'>(Exact name of registrant as specified in its charter)</div>

| Delaware(State or other jurisdiction of incorporation) |     | 51-0063696(I.R.S. Employer Identification No.) |

<div align='center'>1 Water Street
Camden, NJ 08102-1658
(856) 955-4001 (Address, including zip code, and telephone number, including area code, of
registrant’s principal executive offices)</div>

| M. Susan Hardwick                  
 Chief Executive Officer            
 American Water Works Company, Inc. 
 1 Water Street                     
 Camden, NJ 08102-1658              
 (856) 955-4001                     |     | Stacy A. Mitchell, Esq.                      
 Executive Vice President and General Counsel 
 American Water Works Company, Inc.           
 1 Water Street                               
 Camden, NJ 08102-1658                        
 (856) 955-4001                               |

<div align='center'>(Name, address, including zip code, and telephone number, including area code, of agent for service)

Copies to:</div>

| Joanne R. Soslow, Esq.      
 Morgan, Lewis & Bockius LLP 
 2222 Market Street          
 Philadelphia, PA 19103-2921 
 (215) 963-5000              |     | Jeffrey M. Taylor, Esq.                         
 Vice President, Chief SEC Counsel and Secretary 
 1 Water Street                                  
 Camden, NJ 08102-1658                           
 (856) 955-4001                                  |

Approximate date of commencement of proposed sale to the public: From time to time after the effective date of this registration statement.

If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box. ¨

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend