Company: AWK
Filing Date: 2025-02-19
Form Type: 10-K
Source: 0001410636-25-000022
Chunk: 162

Company: American Water Works Company, Inc.
Filing Date: 2025-02-19
Form: 10-K
Item: Item 7
Chunk 162
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 Accounting Policies and Note 15—Employee Benefits in the Notes to Consolidated Financial Statements for additional information regarding the description of and accounting for the defined benefit pension plans and postretirement benefit plans.

The Company’s pension and postretirement benefit costs are developed from actuarial valuations. Inherent in these valuations are key assumptions provided by the Company to its actuaries, including the discount rate and expected long-term rate of return on plan assets. Material changes in the Company’s pension and postretirement benefit costs may occur in the future due to changes in these assumptions as well as fluctuations in plan assets. The assumptions are selected to represent the average expected experience over time and may differ in any one year from actual experience due to changes in capital markets and the overall economy. These differences will impact the amount of pension and other postretirement benefit expense that the Company recognizes. The primary assumptions are:

•Discount Rate—The discount rate is used in calculating the present value of benefits, which are based on projections of benefit payments to be made in the future. The objective in selecting the discount rate is to measure the single amount that, if invested at the measurement date in a portfolio of high-quality debt instruments, would provide the necessary future cash flows to pay the accumulated benefits when due.

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•Expected Return on Plan Assets (“EROA”)—Management projects the future return on plan assets considering prior performance, but primarily based upon the plans’ mix of assets and expectations for the long-term returns on those asset classes. These projected returns reduce the net benefit costs the Company records currently.

•Rate of Compensation Increase—Management projects employees’ pay increases, which are used to project employees’ pension benefits at retirement.

•Health Care Cost Trend Rate—Management projects the expected increases in the cost of health care.

•Mortality— Management adopted the Society of Actuaries Pri-2012 base mortality table, the most recent table developed from private pension plan experience, which provides rates of mortality in 2012 and adopted the MP-2021 mortality improvement scale to gradually adjust future mortality rates downward due to increased longevity in each year after 2012.

The discount rate assumption, which is determined for the pension and postretirement benefit plans independently, is subject to change each year, consistent with changes in applicable high-quality, long-term corporate bond indices. The Company uses an approach that approximates the process of settlement of obligations tailored to the plans’ expected cash flows by matching the plans’ cash flows to the coupons and expected maturity values of individually selected bonds.