Company: AWK
Filing Date: 2025-02-27
Form Type: S-3ASR
Source: 0001410636-25-000050
Chunk: 6

Company: American Water Works Company, Inc.
Filing Date: 2025-02-27
Form: S-3ASR
Chunk 6
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 in your name through the Plan when you enroll, as described immediately below.

• You may become a registered owner by enrolling in and purchasing American Water common stock through the Plan. The minimum initial purchase is $100.00. Complete the enrollment form and mail the form to Equiniti, together with a check payable to “Equiniti Trust Company, LLC” at the address designated for transaction processing provided in Question 3. You can request an enrollment form by telephoning Equiniti at 1-888-556-0423. All payments must be in U.S. dollars and drawn on a U.S. bank. If you are not in the United States, contact your bank to verify that it can provide you with a check that clears through a U.S. bank and can print the dollar amount in U.S. funds. Due to the longer clearance period, neither American Water nor Equiniti are able to accept checks clearing through non-U.S. banks. Please do not send cash.

#### 3. Who is the Plan Administrator?
Equiniti, American Water’s transfer agent, is the administrator for the Plan (the “Plan Administrator”). Equiniti keeps records, sends quarterly statements of account and transaction statements to you and performs other administrative duties relating to the Plan. Shares of American Water common stock that you purchase under the Plan or transfer into the Plan will be registered in the name of Equiniti or its nominee, as custodian, and will be credited to your Equiniti account.

You may contact Equiniti by:

| Telephone: |     | 1-888-556-0423                 |
| Mail:      |     | Equiniti Trust Company, LLC    |
|            |     | P.O. Box 10027                 |
|            |     | Newark, NJ 07101               |
|            |     | Attention: Plan Administration |
| Internet:  |     | www.equiniti.com/us            |

Customer service representatives are available between the hours of 8:00 a.m. and 8:00 p.m., Eastern Time, Monday through Friday.

#### 4. What are my dividend reinvestment options?
When you enroll, you will indicate on the enrollment form whether you want the dividends on your shares reinvested. If you choose to reinvest the dividends on your shares, you must elect to reinvest a minimum of 10% of the dividends (if any) paid on shares in your account. If you do not indicate a preference