Science & Technology

Draft Scientific Report Connectivity of Streams and Wetlands to Downstream Waters: A Review and Synthesis of the Scientific Evidence

Synthesizes peer-reviewed scientific literature on the biological, chemical, and hydrologic connectivity of waters and the effects that small streams, wetlands, and open waters have on larger downstream waters such as rivers, lakes, estuaries, and oceans.

Expert Workshop: Nutrient Enrichment Indicators in Streams

Research Highlights

EPA scientists have primary responsibility for the continual development of CMAQ and its related models. There are currently a multitude of research projects underway that focus on a range of topics.

The Ecological and Hydrological Significance of Ephemeral and Intermittent Streams in the Arid and Semi-arid American Southwest

The report synthesizes current knowledge of the ecology and hydrology of ephemeral and intermittent streams in the Southwest

Borehole Resistivity

normal and focused borehole resistivity

Self-Potential (SP)

self-potential surface geophysical method

Region 4: Risk Assessment Contacts

Region 4 public points of contact, resources, and research publication on risk assessment.

SmartWay Verified List of Idling Reduction Technologies for Locomotives

This list shows SmartWay Verified IRTs for locomotives.

Summary of September 2025 Updates to Aquatic Life Benchmarks Table

Summary of updates to aquatic life benchmarks table for new registrations and updated registrations.

Manufacturer-Run In-Use Testing Program Data for Heavy-Duty Diesel Engines – Test Order Year 2021

This page provides manufacturer-run in-use testing program data from heavy-duty diesel engine manufacturers in compliance with 40 CFR 86 Subpart T for Test Year 2021.

Healthy School Renovations

Integrating IAQ Tools for Schools in school renovations.

Enforceable Consent Agreement for Environmental Testing on Octamethylcyclotetrasiloxane (D4)

EPA has entered into an Enforceable Consent Agreement with five manufacturers of octamethylcyclotetrasiloxane, which is widely used as a chemical intermediate and component of personal care products.

Cyclic Aliphatic Bromides Cluster (HBCD cluster) Scope Document and Supplemental Files

scope document and supplemental files for HBCD

Paint Removers: Methylene Chloride and n-Methylpyrrolidone (NMP)

This webinar described the risks associated with NMP, provided an overview of TSCA section 6, and solicited input on ways EPA should address identified risks, with a particular emphasis on vulnerable populations.

Public Meeting on Risk Evaluation Scoping Efforts under TSCA for 10 Chemical Substances - Background Material & Presentation

This page contains presentation and background material on the ten chemical substances that will be the subject of a public meeting on February 15, 2017, on risk evaluation scoping efforts.