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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

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This page provides contact information.

Outreach and Educational Materials

Landing page for all education and outreach materials.

Green Infrastructure Federal Collaborative

The Green Infrastructure Federal Collaborative fosters engagement and cooperation between agencies that actively work to promote the implementation of green infrastructure.

Northwest Indiana Urban Waters Partnership

This page provides background information on the Northwest Indiana Area one of the 18 Designated Urban Waters Locations.

Alternative Energy at Superfund Sites

Find the current status of alternative and renewable energy projects at Superfund sites, site examples and case studies, and tools and resources for renewable and alternative energy reuse.

Base Realignment and Closure Act Sites

This page provides information and links regarding the EPA's work on base realignment and closure (BRAC).

Urban Waters and the San Antonio River Basin within Bexar County (Texas)

The San Antonio River Basin of the Urban Waters Federal Partnership (UWFP) reconnects urban communities with their waterways by improving coordination among federal agencies and collaborating with community-led efforts.

Rooster Management, LLC - Clean Water Act Public Notice

The EPA is providing notice of a proposed Administrative Penalty Assessment against Rooster Management, LLC, for alleged violations at the site located in Section 20, Township 46, Range 30, Cass County, Missouri.

City of Riverton, Wyoming - Clean Water Act Public Notice

The EPA is providing notice of a proposed Administrative Penalty Assessment in the form of an Expedited Settlement Agreement (“ESA”) against the city of Riverton, Wyoming, for alleged violations associated with sewage sludge in or around Riverton, Wyoming.

City of Dixon, Missouri - Clean Water Act Public Notice

The EPA is providing notice of a proposed Administrative Penalty Assessment against the city of Dixon, Missouri, for alleged violations stemming from the operation of the publicly owned treatment works (“POTW”) owned and operated by the City.

Fremont, Nebraska - Clean Water Act Public Notice

The EPA is providing notice of a proposed Administrative Penalty Assessment against the city of Fremont, Nebraska, a municipality in Dodge County, Nebraska, for alleged violations of its municipal separate storm sewer system.

Pilot Travel Centers LLC - Clean Water Act Public Notice

The EPA is providing notice of a proposed Administrative Penalty Assessment against Pilot Travel Centers LLC, a business headquartered in Knoxville, Tennessee, for alleged violations stemming from the operation of the company’s Warrenton, Missouri and Gret

BF Byproducts, LLC - Clean Water Act Public Notice

The EPA is providing notice of a proposed Administrative Penalty Assessment against BF Byproducts, LLC, a business located at 13210 Russell Drive, Cabool, MO, 65689 for alleged violations at the facility located at the address set forth above.

Magruder Limestone, Inc. - Clean Water Act Public Notice

The EPA is providing notice of a proposed Complaint and Administrative Penalty Assessment against Magruder Limestone, Inc., which operates the Foley Quarry located in Section 26, Township 50 North, Range 2 East, Lincoln County, Missouri.

Assessment of St. Louis Land Bank

The St. Louis Land Bank, established in 1971, is the oldest in the country and manages over 12,000 vacant properties in the city. Land banks are operated by local governments to manage properties that have little to no value to private parties with the goa