Second Quarter/YTD 2023 Results

Science-Based Goals for Scope 1 and 2 GHG Emissions Reductions - Aligned with Paris Agreement • • AMERICAN WATER Medium-term: By 2035, reduce absolute Scope 1 and 2 emissions by 50% (2020 baseline¹) Long-term: Achieve Net Zero Scope 1 and 2 emissions by 2050 Medium- and long-term goals are science-based and aligned with the Paris Agreement Complements existing short-term target of reducing absolute Scope 1 and 2 emissions by 40% by 2025 (2007 baseline) Our focus: invest to improve sustainability while prioritizing customer affordability, resiliency & environmental justice American Water's Path to GHG Emissions Reduction in 2035 +6% Customer Growth 1 & Increased Energy Use ~$150M-$300M Total Capital Investment (40-45%) Greening of Electric Grid 2 (5-7%) Renewable Energy (5-7%) Water Use & Efficiency (3-5%) Pumping & Operational (1 -3%) Fleet & Building Efficiency Efficiency 854,000 ■Scope 2 Emissions MT CO2e (Rounded) Scope 1 Emissions MT CO2e (Rounded) 545,000 790,000 481,000 273,000 64.000 2007 64.000 2020 2035 Target 2050 Target 1 Includes organic growth; annual adjustments to baseline will occur to incorporate growth through acquisitions 2 Assumes States' renewable portfolio standards will be achieved and power providers will fulfill stated carbon transition plans 42

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