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ActiveU.S. Environmental Protection Agency · 2026

Drinking Water Infrastructure Grants‑Tribal Set‑Aside (DWIG‑TSA) Emerging Contaminants Supplemental

Quick Facts

Agency: U.S. Environmental Protection Agency
Funding: $16,000,000
Deadline: Check Source
Status: Active
Eligibility: Federally recognized Tribes (or IHS acting on behalf of Tribes) operating community or non-profit non-community drinking water systems serving Tribal populations.
Grant Type: Equipment
Geographic Scope: National

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About This Grant

Drinking Water Infrastructure Grants‑Tribal Set‑Aside (DWIG‑TSA) Emerging Contaminants Supplemental is sponsored by U.S. Environmental Protection Agency. EPA’s DWIG‑TSA Emerging Contaminants Supplemental provides dedicated funding under the Infrastructure Investment and Jobs Act to address PFAS and other emerging contaminants in drinking water systems serving Tribes.

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Official Opportunity Details

Extracted from the official opportunity page/RFP to help you evaluate fit faster.

Drinking Water Infrastructure Grants - Tribal Set-Aside Program | US EPA Drinking Water Infrastructure Grants - Tribal Set-Aside Program Drinking Water Infrastructure Grants - Tribal Set-Aside Program Program eligibility requirements The 1996 amendments to the Safe Drinking Water Act (SWDA), established the Drinking Water State Revolving Fund (DWSRF) . The SDWA also authorized EPA to set-aside up to 1.

5% of the DWSRF for grants to improve the infrastructure of drinking water systems that serve Tribes (SDWA §1452i). Starting in 2010, Congress increased the Tribal set aside funds to 2%. Through this authority, EPA established the Drinking Water Infrastructure Grants Tribal Set-Aside (DWIG-TSA) Program.

Community water systems and non-profit, non-community water systems that serve a Tribal population are eligible to have projects funded, in whole or in part, with DWIG-TSA funds. Information about implementation of the DWIG-TSA program can be found in the Program Implementation section below. Examples of program successes can be found here: 20 Years of Protecting Public Health on Tribal Lands: EPA Drinking Water Infrastructure Grants .

The 2016 Water Infrastructure Improvements for the Nation Act (WIIN Act) expanded the activities that are now eligible for DWIG-TSA funds, to include training and operator certification programs.

The 2021 Infrastructure Investment and Jobs Act (IIJA) provided a historic $15 billion in dedicated funding through the DWSRF and DWIG-TSA appropriation for lead service line identification and replacement and $4 billion in dedicated funding for addressing perfluoroalkyl and polyfluoroalkyl substances (PFAS) and other emerging contaminants.

The table below provides a summary of the four types of funding available to Tribes under the DWIG-TSA.

DWIG-TSA Funding Program Name Funding Purpose Total Amount Available to Tribes in Fiscal Year 2025 DWIG-TSA Base Funds improvements to public water systems (PWS) serving Tribes, focusing on facilitating compliance with NPDWRs; includes training and operator certification programs; program goals also include improved access to drinking water.

$22,517,000 DWIG-TSA General Supplemental Additional funding appropriated under the Infrastructure Investment and Jobs Act (IIJA) to supplement the DWIG-TSA Base funds in FY 2022- FY 2026. Administration of these funds will follow the same requirements and procedures as Base funds.

$52,060,000 DWIG-TSA Emerging Contaminants Supplemental Additional funding appropriated under the Infrastructure Investment and Jobs Act (IIJA) specifically for activities to address PFAS and other emerging contaminants in water systems serving Tribes.

$16,000,000 DWIG-TSA Lead Service Line Replacement Supplemental Additional funding appropriated under the Infrastructure Investment and Jobs Act (IIJA) specifically for lead service line identification and replacement in water systems serving Tribes. $60,000,000 Program Eligibility Requirements Any federally recognized Tribe is eligible to receive a grant.

If the Indian Health Service (IHS) agrees, Tribes may request that IHS receive the project funds to administer the project. Funds can be used only for planning and construction expenditures at community or non-profit non-community drinking water systems that serve Tribes. Funds must be used to address the most significant threats to public health.

These funds cannot be used for compliance monitoring, operation, and maintenance of a system. Examples of projects funded by the DWIG-TSA Base funding program are: Rehabilitation or development of sources of drinking water; Installation or upgrade of treatment facilities; Installation or upgrade of storage facilities; Installation or replacement of transmission or distribution pipes; or Replacement of aging water system infrastructure.

Projects can also be funded to develop project engineering reports, engineering design work and project administration. Program-Specific Eligibility Requirements: DWIG-TSA Base and General Supplemental: Funds may be used only for projects that facilitate compliance with the National Primary Drinking Water Regulations (NPDWRs) or will further the health protection objectives of the SDWA.

DWIG-TSA Lead Service Line Replacement Supplemental: Funds may be used for lead service line replacement projects and associated activities directly connected to the identification, planning, design, and replacement of lead service lines.

Any project funded under this appropriation involving the replacement of a lead service line must replace the entire lead service line, not just a portion, unless one portion has already been replaced or is concurrently being replaced with another funding source.

Additional information on IIJA lead service line replacement funding, with examples of eligible projects and activities to be funded under this DWIG-TSA appropriation, can be found in the IIJA SRF Implementation Memo , published in May 2022 and the November 2025 memo, titled Additional Eligibilities for State Implementation of the IIJA DWSRF LSLR Appropriation .

DWIG-TSA Emerging Contaminants Supplemental: Funds may be used for projects and activities that address emerging contaminants in drinking water with a focus on PFAS. Projects with a primary purpose to address a contaminant for which EPA has promulgated a National Primary Drinking Water Regulation (NPDWR) are not eligible for funding under this appropriation with the exception of PFAS.

For example, a project whose primary purpose is to address arsenic or nitrate in drinking water is not eligible for this funding because arsenic and nitrate are regulated under the NPDWRs, however, these types of projects may be eligible for funding under the DWIG-TSA Base or General Supplemental appropriations.

Additional information on IIJA emerging contaminants funding, with examples of eligible projects and activities to be funded under this DWIG-TSA appropriation, can be found in the IIJA SRF Implementation Memo . EPA uses formulas to allocate DWIG-TSA program funds among the EPA Regional Offices annually.

Information about the allocation formulas and the the associated Tribal consultation process can be found here: Regional Allocation Formulas for Non-Competitive Tribal Drinking Water Infrastructure Grants: An Amendment to the Drinking Water Infrastructure Grants – Tribal Set-Aside Program Revised Guidelines (pdf) (298.

23 KB, June 28, 2023) Potential Revisions to the DWIG-TSA Allocation Formula Tribal Consultation Summary (pdf) Information on Regional allotments of DWIG-TSA funds can be found here: Current and Historical DWIG-TSA Allocations Information on Regional allotments of funds can also be found in the following funding memoranda: EPA's FY 2025 Funding Memorandum FY25 DWIG-TSA Lead Service Line Replacement Allotment Memo (pdf) EPA's FY 2024 Funding Memorandum (pdf) (383.

4 KB) EPA's FY 2023 Funding Memorandum (pdf) (451. 6 KB) EPA's FY 2022 Funding Memorandum (pdf) (430. 4 KB) Determining Tribal Drinking Water Funding Needs EPA’s Drinking Water Infrastructure Needs Survey and Assessment (DWINSA) reports funding needs that are required to maintain and improve the nation’s drinking water infrastructure to protect public health.

These needs include projects to ensure compliance with the SDWA that are eligible for funding under the DWSRF and the DWIG-TSA. As part of the DWINSA, EPA documents the 20-year capital investment needs for American Indian and Alaska Native Village water systems. As directed by the SDWA, EPA uses the results of the survey as a tool for allocating DWSRF to the Tribes.

The following links provide information from the latest survey, conducted in 2021, and previous surveys that included Tribal water systems: 7th Drinking Water Infrastructure Needs Survey and Assessment Fact Sheet – April 2023 – Provides an overview of the 7th DWINSA conducted in 2021 7th Drinking Water Infrastructure Needs Survey and Assessment FAQs – April 2023 2011 Drinking Water Infrastructure Needs Survey and Assessment: Fifth Report to Congress - Documents the fifth DWINS conducted by EPA in 2010.

EPA’s 2011 Drinking Water Needs Survey and Assessment Fact Sheet. Drinking Water Infrastructure Needs Survey-First Report to Congress - Documents the first DWINS conducted by EPA in 1997. In fiscal year 2012, Congress provided EPA with the authority to transfer funds between the Clean Water Indian Set Aside (CWISA) and DWIG-TSA Programs.

In 2013, EPA began implementing this authority by allowing Regions to transfer up to 33% of a Region’s DWIG-TSA allotment between the two programs. DWIG-TSA and CWISA funding appropriated under the Infrastructure Investment and Jobs Act (IIJA) may be transferred between the two programs with some limitations.

Regions may only transfer funds between the specific Infrastructure Investment and Jobs Act (IIJA) appropriations in the equivalent CWISA or DWIG-TSA program. In other words, Regions may only transfer funds between the CWISA and DWIG-TSA Infrastructure Investment and Jobs Act (IIJA) General Supplemental grants or between the CWISA and DWIG-TSA Emerging Contaminants grants.

Because there is no similar CWISA appropriation for Lead Service Line Replacement, no funds may be transferred from or to the DWIG-TSA IIJA Lead Service Line Replacement appropriation. Regions also may not transfer IIJA appropriations to or from base appropriations. The Role of the EPA Regions EPA Regions approve grants to Tribes to address drinking water infrastructure needs under DWIG-TSA.

Regions are responsible for developing a quantifiable approach for project selection that is consistent with the “Drinking Water Infrastructure Grants Tribal Set-Aside Program: Revised Guidelines Final, December 2013. ” Each Regional office has its own method of identifying and prioritizing projects to be funded under the DWIG-TSA program.

Implementation Documents: The following documents contain detailed information to guide the implementation of the DWIG-TSA programs: Drinking Water Infrastructure Grants Tribal Set-Aside Program Revised Guidelines (pdf) (revised June 2025): This document contains information to guide the implementation of all DWIG-TSA programs.

This document was created in 2013 and minor updates were made in June 2025 to reflect changes to information on applicable federal cross-cutting requirements described in Appendix E. It includes information on funding eligibilities and program implementation roles and responsibilities.

The documents below supplement these basic program guidelines with information on implementing DWIG-TSA program components established under the 2016 WIIN Act and the 2021 Infrastructure Investment and Jobs Act (IIJA) . Regional Allocation Formulas for Non-Competitive Tribal Drinking Water Infrastructure Grants: An Amendment to the Drinking Water Infrastructure Grants – Tribal Set-Aside Program Revised Guidelines (pdf) (298.

23 KB, June 28, 2023) Amendments to the Drinking Water Infrastructure Grants Program as Required by the Water Infrastructure Improvements for the Nation Act Memo: The 2016 WIIN Act expanded the activities that qualify for DWIG-TSA to include training and operator certification for operators of public water systems serving American Indians and Alaskan Natives.

This memorandum provides direction on the implementation of these new eligibilities under the DWIG-TSA.

Implementation of the Tribal Water Infrastructure Appropriations in the Infrastructure Investment and Jobs Act (IIJA) Memorandum, May 27, 2022 : This memorandum describes EPA’s approach to implementing the Tribal set-asides of the water infrastructure appropriations in the Infrastructure Investment and Jobs Act (IIJA) , including the funds appropriated for lead service line replacement and emerging contaminants.

Additional Eligibilities for State Implementation of the IIJA DWSRF LSLR Appropriation (November 2025): This memorandum discusses important flexibilities under the IIJA DWSRF LSLR appropriation including the use of funds for galvanized service lines downstream of lead, timing for replacement of the customer-owned and system-owned portions of lead service lines, and eligible circumstances for integrated components directly connected to the identification, planning, design, and replacements of lead service lines.

Contact your region’s EPA Regional Drinking Water Infrastructure Grant Tribal Set-Aside Coordinators , for more information on DWIG-TSA and its implementation. Safe Drinking Water on Tribal Lands Contact Us About Safe Drinking Water on Tribal Lands Contact Us About Safe Drinking Water on Tribal Lands to ask a question, provide feedback, or report a problem. Last updated on February 26, 2026

Eligibility Requirements

Federally recognized Tribes (or IHS acting on behalf of Tribes) operating community or non-profit non-community drinking water systems serving Tribal populations.

Frequently Asked Questions

Who can apply for Drinking Water Infrastructure Grants‑Tribal Set‑Aside (DWIG‑TSA) Emerging Contaminants Supplemental?

According to the current listing, eligibility includes: Federally recognized Tribes (or IHS acting on behalf of Tribes) operating community or non-profit non-community drinking water systems serving Tribal populations. Confirm the full requirements in the official notice before applying.

How much funding does Drinking Water Infrastructure Grants‑Tribal Set‑Aside (DWIG‑TSA) Emerging Contaminants Supplemental offer?

The current listing shows $16,000,000. Verify award ceilings, matching requirements, and allowable costs in the official notice.

Who funds Drinking Water Infrastructure Grants‑Tribal Set‑Aside (DWIG‑TSA) Emerging Contaminants Supplemental?

Drinking Water Infrastructure Grants‑Tribal Set‑Aside (DWIG‑TSA) Emerging Contaminants Supplemental is funded by U.S. Environmental Protection Agency. Verify program details on the funder's official page before applying.

Is Drinking Water Infrastructure Grants‑Tribal Set‑Aside (DWIG‑TSA) Emerging Contaminants Supplemental available nationwide?

Yes — this listing is flagged as national in scope, so applicants across the U.S. may apply, subject to the sponsor's other eligibility criteria.

How do I apply for Drinking Water Infrastructure Grants‑Tribal Set‑Aside (DWIG‑TSA) Emerging Contaminants Supplemental?

Start from the official opportunity page linked in this listing — it carries the sponsor's submission instructions.

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