Company: AWK
Filing Date: 2025-02-27
Form Type: S-3ASR
Source: 0001410636-25-000050
Chunk: 2

Company: American Water Works Company, Inc.
Filing Date: 2025-02-27
Form: S-3ASR
Chunk 2
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 if you are not currently an American Water shareholder.

• Reinvest your cash dividends in American Water common stock.

• Authorize automatic investments in American Water common stock from your checking or savings account.

See “How the Plan Works—What price will I pay for shares?” on page 5 of this prospectus for an explanation of how the price for shares purchased under American Water Stock Direct will be determined.

American Water’s common stock is listed on the New York Stock Exchange under the ticker symbol “AWK.” The mailing address of American Water’s principal executive offices is 1 Water Street, Camden, NJ 08102-1658, and the telephone number is (856) 955-4001.

Investing in American Water securities involves risk. See “

#### Risk Factors

#### ” on page 2 of this prospectus.
Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or accuracy of this prospectus. Any representation to the contrary is a criminal offense.

#### The date of this Prospectus is February 27, 2025
|                                  |     | Table ofContents                                                                                              |     |      |
|                                  |     |                                                                                                               |     | Page |
| PLAN SUMMARY                     |     |                                                                                                               |     |    1 |
| RISK FACTORS                     |     |                                                                                                               |     |    2 |
| HOW THE PLAN WORKS               |     |                                                                                                               |     |    2 |
| 1.                               |     | Who is eligible to participate in the Plan?                                                                   |     |    2 |
| 2.                               |     | How do I enroll in the Plan?                                                                                  |     |    2 |
| 3.                               |     | Who is the Plan Administrator?                                                                                |     |    3 |
| 4.                               |     | What are my dividend reinvestment options?                                                                    |     |    3 |
| 5.                               |     | How do I make an additional purchase?                                                                         |     |    4 |
| 6.                               |     | How are shares purchased for my account?                                                                      |     |    4 |
| 7.                               |     | When will shares be purchased?                                                                                |     |    5 |
| 8.                               |     | What price will I pay for shares?                                                                             |     |    5 |
| 9.                               |     | How do I transfer shares that I hold