Skip to main content
U.S. flag

An official website of the United States government

Here’s how you know

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

HTTPS

Secure .gov websites use HTTPS
A lock (LockA locked padlock) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

    • Environmental Topics
    • Air
    • Bed Bugs
    • Cancer
    • Chemicals, Toxics, and Pesticide
    • Emergency Response
    • Environmental Information by Location
    • Health
    • Land, Waste, and Cleanup
    • Lead
    • Mold
    • Radon
    • Research
    • Science Topics
    • Water Topics
    • A-Z Topic Index
    • Laws & Regulations
    • By Business Sector
    • By Topic
    • Compliance
    • Enforcement
    • Laws and Executive Orders
    • Regulations
    • Report a Violation
    • Environmental Violations
    • Fraud, Waste or Abuse
    • About EPA
    • Our Mission and What We Do
    • Headquarters Offices
    • Regional Offices
    • Labs and Research Centers
    • Planning, Budget, and Results
    • Organization Chart
    • EPA History

Breadcrumb

  1. Home
  2. Safe Drinking Water on Tribal Lands

Tribal Governments Role in Safe Drinking Water on Tribal Lands

On this page:

  • Background
  • What are the advantages and responsibilities of primacy?
  • Some Eligibility Requirements for TAS
  • Some Additional Resources and Contact Information about Tribal Primacy

Background

Primacy is the process through which states and tribes implement and enforce federal environmental regulations. Under the Safe Drinking Water Act (SDWA), EPA can delegate primacy and grant “Treatment in the Same Manner as a State (TAS)” to tribes meeting certain requirements. These tribes implement programs like the Public Water System Supervision (PWSS) and enforce regulations within their jurisdiction.

Since 1976, Congress has appropriated funds under the SDWA for grants to help states develop and implement their PWSS programs.

Because of their unique status, tribes were not eligible to assume primacy in the original Act. Instead, EPA Regions were responsible for primary enforcement authority of the PWSS program in Indian country. Amendments to SDWA in 1986 allowed federally recognized tribes to receive primacy.

To receive primacy for the PWSS program, a tribe must apply for and receive TAS status. The Navajo Nation is the only tribe with TAS status and primacy over the PWSS program. Having primacy, the Navajo Nation enforces SDWA regulations and program requirements for public water systems within their jurisdiction.

EPA Regional offices serve as the primacy agency for tribes that do not have primacy. As the primacy agency, EPA directly implements the PWSS program and enforces SDWA regulations.


What are the advantages and responsibilities of primacy?

Tribal primacy for the PWSS program allows the tribes to more fully exercise their sovereign powers by establishing and enforcing environmental regulations for PWSS within their jurisdiction.

Tribes that assume primacy also take over many of the responsibilities otherwise managed by EPA. These include, but are not limited to:

  • Adopting and implementing the NPDWRs;

  • Enforcing and responding to regulations;

  • Maintaining compliance data systems;

  • Certifying laboratories; and

  • Performing sanitary surveys.


Eligibility Requirements for TAS

Primacy and TAS are sought out in conjunction, not separately. In order to be determined eligible for TAS in the PWSS program, a tribe must meet the following criteria:

  • Be recognized by the Secretary of the Interior;
  • Have a functional tribal government responsible for the health, safety and welfare of the tribal community;
  • Demonstrate that the regulatory functions to be performed in the public water systems are within the Indian Tribal government’s jurisdiction; and
  • Be capable of administering an effective PWSS program consistent with the SDWA and all applicable regulations.

Additional Resources and Contact Information about Tribal Primacy

  • The Tribal Primacy: An Overview – a pamphlet that outlines the steps a tribe should take to obtain primacy for the PWSS program. It discusses important considerations regarding primacy and describes the responsibilities of a tribe that has primacy.
  • TAS For the Public Water System Supervision Program: Factsheet - a quick reference guide to the TAS requirements and application process.
  • TAS For the Public Water System Supervision Program: Frequent Questions.

The TAS Regulation has more information on TAS eligibility requirements and application procedure. For more information on the process of obtaining TAS for the Public Water System Supervision (PWSS) Program, contact your Regional Tribal Drinking Water Direct Implementation Coordinator.

Safe Drinking Water on Tribal Lands

  • SDWA on Tribal Lands
  • Compliance with SDWA
  • Tribal Drinking Water Funding Programs
Contact Us About Safe Drinking Water on Tribal Lands
Contact Us to ask a question, provide feedback, or report a problem.
Last updated on December 18, 2024
  • Assistance
  • Spanish
  • Arabic
  • Chinese (simplified)
  • Chinese (traditional)
  • French
  • Haitian Creole
  • Korean
  • Portuguese
  • Russian
  • Tagalog
  • Vietnamese
United States Environmental Protection Agency

Discover.

  • Accessibility Statement
  • Budget & Performance
  • Contracting
  • EPA www Web Snapshot
  • Grants
  • No FEAR Act Data
  • Plain Writing
  • Privacy
  • Privacy and Security Notice

Connect.

  • Data
  • Inspector General
  • Jobs
  • Newsroom
  • Regulations.gov
  • Subscribe
  • USA.gov
  • White House

Ask.

  • Contact EPA
  • EPA Disclaimers
  • Hotlines
  • FOIA Requests
  • Frequent Questions
  • Site Feedback

Follow.