About EPA

EPA in the Pacific Southwest Videos

Videos highlighting projects, events and environmental issues in or related to the EPA's Pacific Southwest (Region 9).

Public Health

Community health near brownfield sites affected by environmental, socio-economic and extreme weather factors.

Brownfields All Appropriate Inquiries

All Appropriate Inquiries

Re: Request for Correction (#14003) under the EPA Information Quality Guidelines

Request from Anne LeHuray to update inaccurate information concerning RTS Summary Exhibits B and C.

Photo Galleries for the Mystic River Watershed

Collection of photo galleries for the Mystic River Watershed

About the Drinking Water Report of Joint Base Pearl Harbor-Hickam & Aliamanu Military Reservation Public Water Systems

Following the 2021 fuel spill at Red Hill, EPA conducted a thorough assessment of information collected during the emergency response and drinking water monitoring. EPA has released its final report on the condition of the public water systems.

Exchange Network Grant Program

States, territories, and tribes can find resources related to the Exchange Network Grant Program to facilitate their involvement in the development and implementation of the Exchange Network.

Protect Children's Health: Natural Disasters and Emergencies

Learn how to protect children's health during, before, and after disasters and emergencies.

Bringing the Benefits of Energy Efficiency and Renewable Energy to Low-Income Communities: Case Studies and Program Profiles

Helps state and local staff connect with EPA initiatives that can assist them in expanding or developing their own EE/RE energy and climate initiatives in ways that benefit low-income communities.

Environmental Information Exchange Network (EN)

The Environmental Information Exchange Network (EN) is an Internet-based system used by state, tribal and territorial partners to securely share environmental and health information with one another and EPA.

January–March 2026 Newsletter

See our first newsletter of 2026 for stories on progress at cleanup sites in California and Arizona, and more!

Pacific Southwest (Region 9) Media Center

News media, state and local officials, and others can find press releases, media events and contacts in EPA's Pacific Southwest. Additional resources include newsletters, annual reports, and library services that support regional activities.

Brownfields and Land Revitalization in EPA Region 8

EPA Region 8 manages Brownfields and Land Revitalization programs in Colorado, Montana, North Dakota, South Dakota, Utah and Wyoming.

ICYMI: EPA’s New Guidance Removes Requirement for Diesel Exhaust Fluid (DEF) Sensors, Saves American Operators Billions

On Friday, March 27, 2026, President Trump announced U.S. EPA Administrator Lee Zeldin has issued new guidance making it clear DEF sensors are no longer required, and NOx sensors can be used instead to meet regulatory requirements.

Release Date: March 31, 2026