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 and Toxics
    • Climate Change
    • Emergency Response
    • Environmental Information by Location
    • Environmental Justice
    • Greener Living
    • Health
    • Land, Waste, and Cleanup
    • Lead
    • Mold
    • Pesticides
    • Radon
    • 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
    • EPA Administrator
    • Headquarters Offices
    • Regional Offices
    • Labs and Research Centers
    • Planning, Budget, and Results
    • Organization Chart
    • EPA History
    • Staff Directory
Emergency Planning and Community Right-to-Know Act (EPCRA)
Contact Us

Section 302 notification requirements and mixtures with unknown components

Are facilities exempt from Section 302 notification requirements if they produce, use, or store mixtures whose extremely hazardous substance component information is not available on the MSDS provided by the manufacturer?

If the facility which produces, uses, or stores mixtures knows or reasonably should know the components of the mixture, the facility owner or operator must notify under Section 302 if the extremely hazardous substance component is more than one percent of the total weight of the mixture and equal to or more than the threshold planning quantity.

  • EPCRA Home
  • About EPCRA
  • Emergency Planning
  • Emergency Release Notifications
  • Hazardous Chemical Inventory Reporting
  • EPCRA Trade Secrets
  • EPCRA Site Map
Contact Us to ask a question, provide feedback, or report a problem.
Last updated on May 30, 2023
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.gov
  • Inspector General
  • Jobs
  • Newsroom
  • Open Government
  • Regulations.gov
  • Subscribe
  • USA.gov
  • White House

Ask.

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

Follow.