Science & Technology

Indicators: Nitrogen

Nitrogen, like phosphorus, is a critical nutrient required for all life. Nitrogen can occur in rivers and streams, lakes, and coastal waters in several forms including ammonia (NH3), nitrates (NO3), and nitrites (NO2).

Risk Evaluation for Perchloroethylene (PCE)

documents for Tetrachloroethylene (also known as perchloroethylene)

What is the EPA’s Role?

The EPA provides a wide range of expertise in water quality, marine debris, wetland restoration, and non-point source nutrient reduction to support the Deepwater Horizon Planning efforts and long-term restoration projects. See projects EPA is co-leading.

Risk Evaluation for Tris(2-chloroethyl) Phosphate (TCEP)

EPA designated tris(2-chloroethyl) phosphate (TCEP) as a high priority chemical in December 2019 and the chemical is currently undergoing risk evaluation.

Risk Evaluation for Formaldehyde

EPA designated formaldehyde as a high priority chemical in December 2019 and the chemical is currently undergoing risk evaluation.

WhAEM2000 BBM Files - Corbin, Tennessee

WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Corbin Quadrangle, Tennessee. Files serve as geographic basis for groundwater modeling.

WhAEM2000 BBM Files - Milan, Tennessee

WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Milan Quadrangle, Tennessee. Files serve as geographic basis for groundwater modeling.

WhAEM2000 BBM Files - Alice, Texas (East)

WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Alice Quadrangle, Texas (East). Files serve as geographic basis for groundwater modeling.

WhAEM2000 BBM Files - Cuero, Texas (East)

WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Cuero Quadrangle, Texas (East). Files serve as geographic basis for groundwater modeling.

WhAEM2000 BBM Files - El Campo, Texas (East)

WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for El Campo Quadrangle, Texas (East). Files serve as geographic basis for groundwater modeling.

WhAEM2000 BBM Files - George West, Texas (East)

WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for George West Quadrangle, Texas (East). Files serve as geographic basis for groundwater modeling.

WhAEM BBM Files - Texas (East)

WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for quadrangles in Texas (East portion). Files serve as geographic basis for groundwater modeling.

WhAEM2000 BBM Files - Lufkin, Texas (East)

WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Lufkin Quadrangle, Texas (East). Files serve as geographic basis for groundwater modeling.

WhAEM2000 BBM Files - Natchitoches, Texas (East)

WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Natchitoches Quadrangle, Texas (East). Files serve as geographic basis for groundwater modeling.

WhAEM2000 BBM Files - Stephenville, Texas (East)

WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Stephenville Quadrangle, Texas (East). Files serve as geographic basis for groundwater modeling.

WhAEM2000 BBM Files - Dalhart, Texas (West)

WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Dalhart Quadrangle, Texas (West). Files serve as geographic basis for groundwater modeling.

WhAEM2000 BBM Files - Hartley, Texas (West)

WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Hartley Quadrangle, Texas (West). Files serve as geographic basis for groundwater modeling.

WhAEM2000 BBM Files - Pecos, Texas (West)

WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Pecos Quadrangle, Texas (West). Files serve as geographic basis for groundwater modeling.

WhAEM2000 BBM Files - Tucumcari, Texas (West)

WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Tucumcari Quadrangle, Texas (West). Files serve as geographic basis for groundwater modeling.

WhAEM2000 BBM Files - Virginia Beach, Virginia

WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Virginia Beach Quadrangle, Virginia. Files serve as geographic basis for groundwater modeling.