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Updated May 10, 2024
Department of the Interior Support for Tribal Water Projects

Congress regulates tribal affairs, including tribal access to
water resources, pursuant to its constitutional authority. In
addition, the federal government has a federal trust
responsibility to protect tribal treaty rights, lands, assets,
and water resources on behalf of federally recognized
Tribes (hereinafter Tribes) and tribal members. The
Department of the Interior (DOI) supports water projects
and activities for Tribes through multiple departmental
agencies and programs, including the Bureau of
Reclamation (BOR) and the Bureau of Indian Affairs
(BIA). This In Focus discusses major DOI efforts to support
tribal water projects, including Indian water rights
settlements (IWRS), Indian irrigation projects, and rural
water projects.
Indan       ater Rights Settlements
Since a 1908 Supreme Court ruling (Winters v. United
States, 207 U.S. 564, 575-77), courts generally have held
that many Tribes have a reserved right to water sufficient to
fulfill the purpose of their reservations and that this right
took effect on the date the reservations were established.
This means that, in the context of a state water law system
of prior appropriation (common in many U.S. western
states), many Tribes have priority water rights over non-
tribal users with water rights established subsequent to the
reservations' creation. The quantification of these rights in
many cases remains subject to state legal processes.
IWRS are a means of dispute resolution that allow Tribes to
quantify their unresolved water rights, while also procuring
access to water through infrastructure and other related
expenses. In exchange, non-tribal users gain assurances
related to water rights and potential litigation.
The federal government, through the Secretary of the
Interior's Indian Water Rights Office, takes a leadership
role in coordinating the negotiation and implementation of
individual settlements. In addition to Tribes and federal
government representatives, settlement negotiations may
involve states, water districts, and private water users (i.e.,
water rights holders), among others. Although IWRS are a
popular approach to solving Indian water rights disputes,
disagreements may arise regarding specific compromises in
individual settlements that are deemed unacceptable by one
or more parties.
Approval and implementation of IWRS typically require
federal action-often in the form of congressional approval
in enacting legislation. As of early 2024, Congress had
enacted 35 such settlements. Of these, the federal
government currently has an active implementation role in
19 settlements. Another 20 settlements are currently in the
negotiation phase.

Congress passed authorizing legislation that has directed
the federal government-in concert with tribal
stakeholders-to implement various activities and
infrastructure specific to (and deemed appropriate for)
individual IWRS. This includes funding and support for
major water storage and conveyance infrastructure,
groundwater management, irrigation projects, and
municipal water systems, among other things. Congress
also has approved funding for the ongoing operation and
maintenance (O&M) of some tribal water systems.
In authorizing legislation Congress has, in some cases,
included permanent (mandatory) funding for selected
activities and projects associated with individual
settlements. Congress also has approved broader mandatory
funds available to fund enacted IWRS, subject to specific
criteria. Major mandatory funding sources for IWRS are
depicted below in Figure 1. The Reclamation Water
Settlements Fund (enacted in 2010 in P.L. 111-11), is
available to fund certain priority IWRS, and the Indian
Water Rights Settlement Completion Fund (P.L. 117-58) is
available to fund all 35 settlements approved as of the date
of that bill's enactment (November 15, 2021).
Figure I. Mandatory Appropriations for IWRS
(nominal $ in millions)
Individual Settlement Funds2
Indian Water Rights
Settlement Completion Fund
Redamation Wate
Settlements Fund
Source: Congressional Research Service.
Notes: Settlements generally receive no-year funding, meaning it
remains available until expended, without limitation as to fiscal year.
As of FY2024, much of these funds has not been obligated. Congress
may supplement these funds in future legislation.
Federal funding outside of these sources is typically
provided through annual discretionary appropriations for
the BOR or BIA. For example, BIA's Indian Land and
Water Claim Settlements and Miscellaneous Payments to
Indians (ILWC) account includes funding to implement
IWRS. The BOR also funds individual settlements through
discretionary funding for its Water and Related Resources
Account. For more information, see CRS Report R44148,
Indian Water Rights Settlements, by Charles V. Stern; and
CRS Report R47723, Bureau of Indian Affairs: Overview of

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