Company: AWK
Filing Date: 2025-03-21
Form Type: 11-K
Source: 0001410636-25-000065
Chunk: 5

Company: American Water Works Company, Inc.
Filing Date: 2025-03-21
Form: 11-K
Chunk 5
---
 not intended to qualify as an “Employee Stock Purchase Plan,” as set forth in section 423 of the Internal Revenue Code of 1986, as amended. Participants are subject to any required tax withholding by the Company on the taxable compensation earned under the Plan. Taxable compensation is recognized as imputed income by participants equal to the difference between the aggregate discounted price paid by the participant and the aggregate market price of the shares on the date of the purchase.

<div align='center'>7</div>

### EXHIBIT INDEX
| Exhibit 
 Number  |     | Description                                                                |
| 23.1*   |     | Consent of Kreischer Miller, Independent Registered Public Accounting Firm |

* Filed herewith.

<div align='center'>8</div>

### SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the trustees (or other persons who administer the employee benefit plan) have duly caused this annual report to be signed on its behalf by the undersigned hereunto duly authorized.

| Date: |     | March 21, 2025 |     | American Water Works Company, Inc. and its Designated       
 Subsidiaries 2017 Nonqualified Employee Stock Purchase Plan 
 By:                                                         |     | /s/ AARON MARTIN                                                    |
|:------|:----|:---------------|:----|:------------------------------------------------------------|:----|:--------------------------------------------------------------------|
|       |     |                |     |                                                             |     | Aaron Martin                                                        |
|       |     |                |     |                                                             |     | Vice President, Total Rewards of American Water Works Company, Inc. |

<div align='center'>9</div>