To authorize the International Boundary and Water Commission to accept funds for activities relating to wastewater treatment and flood control works, and for other purposes.

The bill would authorize the U.S. Section of the International Boundary and Water Commission (USIBWC) to accept funds from federal or nonfederal entities — including through grants or funding agreements — to study, design, construct, operate, or maintain wastewater treatment works, water conservation projects, flood control works, and related structures. Any accepted funds would be deposited into the designated USIBWC Treasury account and remain available until spent. The Commission would be required to submit an annual report to four congressional committees describing the activities carried out with those funds and associated costs.

The bill would cap reimbursements or credits given to nonfederal entities at $5 million per fiscal year. It would also prohibit the Commission from accepting funds from any nonfederal entity domiciled in, headquartered in, organized under the laws of, or principally operating in a foreign country of concern, or that has any agreement with such a country. "Foreign country of concern" carries the meaning set in 42 U.S.C. § 19237 (covering countries such as China, Russia, North Korea, and Iran).

The U.S. Section of the International Boundary and Water Commission, which would gain new authority to accept outside funding. State and local governments, water agencies, and nonfederal entities along the U.S.-Mexico border that could contribute funds or receive project credits under the new authority. Entities connected to foreign countries of concern would be explicitly excluded from participating.

Border-region water and flood infrastructure — including projects that address sewage flows from Mexico into California and Texas — often requires more funding than federal appropriations alone provide. This authority would let USIBWC tap state, local, and private contributions, potentially accelerating projects. The $5 million annual reimbursement cap and the foreign-country-of-concern exclusion limit the scope and safeguard national security.

The Commission would accept funds through grants or funding agreements, depositing all receipts into its standing Treasury account. Accepted funds remain available until expended, giving the agency flexibility across fiscal years. Each year, USIBWC must report to four congressional committees — Senate Foreign Relations and Appropriations, and House Transportation and Infrastructure and Appropriations — detailing activities funded and associated costs. The Commission would be responsible for screening nonfederal contributors against the foreign-country-of-concern definition before accepting any funds, and tracking reimbursements to stay within the $5 million annual cap.