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August 2 , 2021 Press Release AMERICAN WATER Exhibit 99.1 Edward Vallejo Vice President , Investor Relations 856-955-4445 edward.vallejo@amwater.com Maureen Duffy Senior Vice President , Communications and External Affairs 856-955-4163 maureen.duffy@amwater.com • AMERICAN WATER REPORTS SECOND QUARTER 2021 RESULTS AFFIRMS 2021 GUIDANCE RANGE • Second quarter 2021 diluted earnings of $ 1.14 per share , compared to $ 0.97 per share in 2020 , a 17.5 % increase ; Year - to - date 2021 diluted earnings of $ 1.87 per share , compared to $ 1.65 per share in 2020 , a 13.3 % increase о Quarter and year - to - date results reflect an estimated favorable impact of $ 0.03 per share from warmer and drier than normal weather in the second quarter of 2021 2021 earnings guidance range of $ 4.18 to $ 4.28 per share affirmed ; long - term earnings growth target range of 7-10 % affirmed • Invested $ 782 million in the first half of the year and added approximately 11,200 customer connections year - to - date through closed acquisitions and organic growth ; Capital plan remains on track to invest approximately $ 1.9 billion in 2021 CAMDEN , N.J. , August 2 , 2021 - American Water Works Company , Inc. ( NYSE : AWK ) today reported results for the quarter ended June 30 , 2021 , of $ 1.14 per share , compared to $ 0.97 per share in 2020 . " American Water employees delivered a strong second quarter with 2021 earnings per share up 17.5 % compared to 2020. These results demonstrate that we continue to grow our business through the consistent execution of our strategies , " said Walter Lynch , president and CEO of American Water . “ In the first six months in 2021 , we invested $ 782 million with the majority dedicated to needed infrastructure improvements to better serve our customers . We continued to minimize the customer bill impacts of these investments through operating and capital efficiencies and by leveraging the size and scale of our business . We added approximately 11,200 customer connections to date through closed acquisitions and organic growth . We also look forward to welcoming an additional 86,900 customer connections through pending acquisitions . ” PRESS RELEASE 1 www.amwater.com