Investor Presentaiton

Reconciliation Table: Rate Base AMERICAN WATER Estimated Rate Base (1) ($ in billions) Net Utility Plant $14.8 As of As of As of 12/31/2016 12/31/2017 12/31/2018 $16.0 As of 12/31/2019 $17.1 $18.6 Less Advances for Construction $0.3 $0.3 $0.3 $0.2 CIAC Contributions in Aid of Construction $1.2 $1.3 $1.3 $1.4 Net Deferred income taxes $2.6 $2.8 $3.0 $3.2 Rate Base Sub Total TOTAL $4.1 $4.3 $4.6 $4.8 $10.7 $11.7 $12.5 $13.7 (1) An approximation of rate base, which includes Net Utility Plant not yet included in rate base pending rate case filings/outcomes. 40

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