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
    • 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
    • Guidance
    • 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. Envirofacts

SDWIS Overview

SDWIS Banner
SDWIS icon

Information about ​safe drinking water is stored in SDWIS, the EPA's Safe Drinking Water Information System. SDWIS tracks information on drinking water contamination levels as required by the 1974 Safe Drinking Water Act and its 1986 and 1996 amendments. The Safe Drinking Water Act (SDWA) and accompanying regulations establish Maximum Contaminant Levels (MCLs), treatment techniques, and monitoring and reporting requirements to ensure that water provided to customers is safe for human consumption. The Safe Drinking Water Information System (SDWIS) contains information about public water systems and their violations of EPA's drinking water regulations. Searching SDWIS will allow you to locate your drinking water supplier and view its violations and enforcement history for the last ten years.

SDWIS Links

  • Overview
  • Search
  • Model
  • Law
  • SDWIS Search User Guide
  • Contact Us
  • Office of Ground Water and Drinking Water Home

System Data Searches

Envirofacts

  • Multisystem Search
  • BR Search
  • GHG Search
  • GHG Query Builder
  • ICIS Search
  • ICIS Air Pollution Search
  • RADNET Radiation Search
  • RadNet Query Builder
  • RCRAInfo Search
  • NEI Search
  • NGGS Search
  • SDWIS Search
  • SEMS Search
  • UV Index Search

Toxic Release Inventory (TRI)

  • TRI Explorer
  • TRI Search
  • Form R Search
  • Form R & A Download
  • EZ Search
  • Customized Search
  • Pollution Prevention

Facility Registry Service (FRS) Query

  • FRS Query
  • FRS Query Builder
  • FRS Organization Query Form

Map of Cleanups in My Community

ECHO

SRS Search

Other Sites of Interest

  • Geospatial Download
  • EnviroMapper
  • MyEnvironment

Envirofacts

  • Search Tools
  • Topic Searches
  • About the Data
  • Developer & Data Services
  • Data Downloads
  • SunWise UV Index Mobile App
  • TRI Search
Contact Us About Envirofacts
Contact Us About Envirofacts to ask a question, provide feedback, or report a problem.
Last updated on July 30, 2025
  • 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.