American Water Works Company, Inc.

ITEM 1. LEGAL PROCEEDINGS

The following information updates and amends the information provided in the Company’s Form 10-K in Item 3—Legal Proceedings, and in the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2025 in Part II, Item 1—Legal Proceedings. Capitalized terms used but not otherwise defined herein have the meanings set forth in the Company’s Form 10-K, and in the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2025. In accordance with the SEC’s disclosure rules, the Company has elected to disclose environmental proceedings involving the Company and a governmental authority if the amount of potential monetary sanctions, exclusive of interest and costs, that the Company reasonably believes will result from such proceeding is $1 million or more.

Alternative Water Supply in Lieu of Carmel River Diversions

Monterey Peninsula Water Supply Project

CPUC Final Approval of Water Supply Project

On May 21, 2025, the CPUC issued a decision authorizing an increase to the cost cap of$11 million for certain of the Water Supply Project’s extraction wells.

On May 9, 2025, the CPUC issued a proposed decision in the Phase 2 that is focusing on updated supply and demand estimates for the Water Supply Project, finding that without the Water Supply Project, projected demand will outstrip supply by approximately 2,500 acre-feet per year. On June 18, 2025, the CPUC issued a decision extending the Phase 2 statutory deadline to October 31, 2025. This Phase 2 matter remains pending.

Coastal Development Permit Application

On March 28, 2025, the Monterey County Superior Court issued an intended decision to deny in full the joint petition for writ of mandate by the City, MCWD and MPWMD. As permitted by the court, written statements were filed identifying issues that were believed to have not been addressed in the intended decision. On May 12, 2025, the court entered its final decision denying the petition in full.

Water Supply Project Land Acquisition and Slant Well Site Use

On June 25, 2025, the SWRCB administrative hearing officer transmitted a final report of an advisory opinion to the SWRCB’s board for approval, as well as to the parties and the Monterey County Superior Court. The final report analyzes potential impacts to the groundwater basin and groundwater users based on predictive modeling presented by the parties’ experts, and concludes, among other things, that the slant well pumping is not expected to materially impact MCWD’s water rights, or its ability to draw water from its wells. The report also finds that although some harm to the groundwater basin may occur in the form of increased seawater intrusion and lowering of groundwater levels, any such harm should be balanced against the benefits of the project, and could be avoided or remedied by a physical solution. A trial in the City’s May 2020 lawsuit against Cal Am and CEMEX is set to begin in November 2025.

Regional Water Quality Control Board Approval of NPDES Permit Amendment

Following submission of the application to amend the relevant NPDES permit to the RWQCB, Cal Am’s and Monterey One Water’s consultants developed a less environmentally impactful alternative that reduces the number of outfall modifications required to accommodate brine discharge. The alternatives analysis was approved by Monterey One Water’s board on June 30, 2025, and was submitted to the RWQCB on July 1, 2025.

Dunbar, West Virginia Class Action Litigation Proposed Settlement

On May 2, 2025, the parties jointly filed for approval by the Circuit Court a proposed class action settlement agreement (the “Dunbar Settlement”) with respect to claims by the Jeffries plaintiffs, and, on May 5, 2025, the Circuit Court issued an order granting preliminary approval of the Dunbar Settlement. The actual total amount to be paid to claimants through the Dunbar Settlement will depend upon the claims submitted and approved through the claims process that is now underway, which includes, among other things: notice that has been provided to the class; obtaining, reviewing and processing properly-submitted claims from potential claimants; and handling any requests to opt out from or object to the Dunbar Settlement. Following the completion of the claims process, the Circuit Court will hold a hearing regarding its final approval of the Dunbar Settlement, which is currently scheduled for September 11, 2025. No contribution by the Company or WVAWC for claims associated with the Dunbar Settlement will be funded unless and until, and to the extent required by, a settlement agreement that receives final approval from the Circuit Court.

As of June 30, 2025, the Company received an initial settlement payment from defendant 3M Company of $34 million, net of legal fees and administrative costs. As of June 30, 2025, these funds were held in a law firm escrow account and are awaiting distribution to the Company’s utility subsidiaries that are parties to the MDL. The Company intends to seek regulatory approval from its respective PUCs to apply the net proceeds for the benefit of customers. The Company anticipates receiving, during the remainder of 2025, additional settlement payments from the defendants named above.