Second Quarter/YTD 2023 Results

New Sustainability Report and Disclosures Highlights AWK's ESG Leadership and Commitment to Transparency American Water Sustainability Report 2021-2022 AMERICAN WATER WE KEEP LIFE FLOWING AMERICAN WATER American Water 2021-2022 Sustainability Report • Highlights our commitment to excellent water quality, customer affordability, and investing in infrastructure, among other key topics identified in the Company's most recent materiality assessment Prepared in accordance with Global Reporting Initiative (GRI), Sustainability Accounting Standards Board (SASB), Task Force on Climate-Related Financial Disclosures (TCFD), and other leading standards Additional Recent Disclosures and Recognition . Inclusion, Diversity & Equity website, DiversityatAW.com, refreshed with employee and Board diversity results through June 30, 2023 First time disclosure of the estimated racial diversity of the communities we serve¹ compared to the racial diversity of our employees as self-identified Received an upgraded MSCI ESG Rating, improving from "A" to "AA" Annual Sustainability Report Publication Will Begin in 2024 (Containing FY 2023 Actuals) 1 Estimated based on residential customer zip code matching of United States 2022 American Community Survey data 29

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