Second Quarter/YTD 2023 Results

Strong Balance Sheet and Credit Ratings AWK Long-Term Senior Unsecured Ratings S&P Global A (Stable Outlook) Moody's Baa1 (Stable Outlook) Low risk business profile ✓ Strong regulatory jurisdictions ✓ Supportive financial plans Ratings and Stable Outlook affirmed at S&P / Moody's (Feb. '23/Dec. '22) Consolidated Debt Maturity Profile as of June 30, 2023 (Rounded) ($ in millions) $1,500 Total Debt to Total Capital** AMERICAN WATER As of June 30, 2023 54% Long-Term Target <60% Liquidity Profile ($ in millions, rounded) Available Liquidity as of 6/30/23 $780 $700 $600 $475 $3,469 $794 $720 Cash $100 $2,675 Credit 2023 2024 2025 2026* 2027 *Proceeds of $720 million from the note related to the sale of HOS are due to the Company in December 2026 ** Percentage shown is net of cash and cash equivalents of $794 million Credit Facility Amended on 10/26/22 Increased Credit Facility capacity by $500 million to $2.75 billion from $2.25 billion Extended maturity to October 2027 Increased capacity to support growing business and capital investment plan 14

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