Data and Tools

Guide to Login for SeqAPASS Users

Login guide for external SeqAPASS users.

CHEMFLO-2000, Interactive Software for Simulating Water and Chemical Movement in Unsaturated Soils

This model simulates water movement and chemical fate and transport in vadose zones.

Infiltration Models

Water applied to the soil surface through rainfall and irrigation events subsequently enters the soil through the process of infiltration.

Summary of EPA Regional Data Quality "Best Practices" for Federal Facilities

This page contains tables that summarize data-quality best practices for federal facilities.

Source Ranking Database (SRD) for Indoor Air Pollutants

The source rank database performs a systematic screening level review of potential indoor pollution sources to identify high-priority product and material categories for further evaluation

Photochemical Modeling Applications

Provides access to modeling applications involving photochemical models, including modeling of ozone, particulate matter (PM), and mercury for national and regional EPA regulations such as the Clean Air Interstate Rule (CAIR) and the Clean Air Mercury Rule

Tools and Resources

Tools and Resources for CI

Cumulative Impacts Explained

Cumulative Impacts Explained web area

PFAS and Aquatic Life

The EPA uses its Clean Water Act authorities to develop recommended water quality criteria and informational benchmarks to help states and authorized Tribes protect aquatic ecosystems from several per- and polyfluoroalkyl substances (PFAS).