About EPA

EPA Region 8 (Mountains and Plains)

Mission, organization and contact information for EPA's Region 8 office in Denver (Mountain States)

Hot Topics in Colorado

Hot topics for the state of Colorado.

Quick Start Tutorial: How to Use COBRA

Learn how to get started using COBRA, the Co-Benefits Risk Assessment.

Find an EPA Drinking Water Operator Certification Contact

Contains list of the contacts and websites for drinking water operator certification depending on region and state.

Find an EPA Capacity Development Contact

Contains table of the contacts for developing water capacity depending on region and state.

Radiation Resources Outside of EPA

EPA does not license nuclear power plants or regulate the non-ionizing radiation from cell phones, smart meters or power lines. This page provides links to the state and federal agencies that regulate these matters.

WHAT THEY ARE SAYING: Leaders Throughout the Country Commend EPA’s Announcement on Diesel Exhaust Fluid

On Tuesday, U.S. Environmental Protection Agency (EPA) Administrator Lee Zeldin announced that the agency is issuing manufacturer guidance to address widespread concerns from truckers, farmers, and other diesel vehicle operators

Release Date: August 14, 2025

ICYMI: EPA Green Lights Diesel Exhaust Fluid (DEF) Fix Protecting Hard-Working American Farmers, Truckers, Equipment Operators

On Tuesday, U.S. Environmental Protection Agency (EPA) Administrator Lee Zeldin announced new guidance urging engine and equipment manufacturers to revise diesel exhaust fluid (DEF) system software in existing vehicles and equipment.

Release Date: August 14, 2025

Marine Engine and Vessel Program Applicability

This web page provides information that vessel owners & operators can use to assess how EPA’s marine engine regulations apply.

Region 8 Grants Information

PowerPoint slides and video recording of the 3/15/23 EPA Region 8 grants webinar. Registration form link was changed to be sign up for additional information about grants.

Frequent Questions for Specific EPA Programs/Topics

EPA's frequent question databases and pages, listed by topic and program name, include agriculture compliance, COVID-19, hazardous waste management and test methods, superfund, fuels registration and reporting, air quality, and more.

산화에틸렌에 대해 더 알아보기

Korean translation of learn more about EtO web page

Nơi để Tìm Hiểu Thêm Về Ethylene Oxide

Vietnamese translation of Where to Learn More About EtO web page

如何獲得更多有關環氧乙烷的資訊

Traditional Chinese translation of Where to learn more about EtO web page.

Population Surrounding 3,975 RCRA Corrective Action Sites

To help describe who benefits from our RCRA Corrective Action (CA) Program cleanup work, EPA collected data on the population living within 3 and 1 mile(s) of RCRA CA sites.

Intranet Standard: Enterprise Intranet Content Management System

EPA’s Enterprise Intranet CMS standard establishes a single platform for managing EPA’s most important internal content (identified in EPA’s Enterprise Intranet Content Standard) to make it easier for employees to create, publish and find the internal info