Data and Tools

Freshwater Explorer

EPA's Freshwater Explorer provides information about background and observed salt and mineral content for freshwater streams, lakes, and wells in all 50 U.S. states, Puerto Rico, and the U.S. Virgin Islands.

Operating Permit Timeline for New Mexico or Albuquerque

Part 70 Title V Operating Permit Timeline for New Mexico

Freshwater Explorer Quick Guide

Freshwater Explorer quick start guidance

Recommendations for Estimating Transport Between Environmental Compartment (Fugacity) for Existing chemicals, including HPV chemicals

provides recommendations for estimating transport between compartments for chemicals

Summary of Texas' Water Reuse Guideline or Regulation for Potable Water Reuse

Texas (State Regulation) | Source water: Treated municipal wastewater | End use: Potable water reuse

Summary of Texas' Water Reuse Guideline or Regulation for Landscaping

Texas (State Regulation) | Source water: Treated municipal wastewater | End use: Landscaping

Summary of Texas' Water Reuse Guideline or Regulation for Industry

Texas (State Regulation) | Source water: Treated municipal wastewater | End use: Water reused for industry

Summary of Texas' Water Reuse Guideline or Regulation for Centralized Non-potable Reuse

Texas (State Regulation) | Source water: Treated municipal wastewater | End use: Centralized non-potable water reuse

Fact Sheet: Watershed Boundaries for the 2002 Impaired Waters Baseline National Geospatial Dataset

Integrated Water Analysis Tools

Integrated water analysis tools offer a wide spectrum of valuable information into a single interface. A few of these tools are applications that are geared for the public.

Summary of Texas' Water Reuse Guideline or Regulation for Agriculture

Texas (State Regulation) | Source water: Treated municipal wastewater | End use: Agriculture

Summary of Texas' Water Reuse Guideline or Regulation for Rainwater Collected Onsite for Potable Water Reuse

Texas (State Regulation) | Source water: Onsite collected waters | End use: Potable water reuse

Summary of Texas' Water Reuse Guideline or Regulation for Onsite Non-Potable Water Reuse

Texas (State Regulation) | Source water: Onsite collected waters | End use: Onsite non-potable reuse

Receive Notifications about the HELP Model

Request to be notified when updates and bug fixes are made to the HELP Model.

Air Quality Models

Air quality models use mathematical and numerical techniques to simulate the physical and chemical processes that affect air pollutants as they disperse and react in the atmosphere.

Air Quality Dispersion Modeling - Preferred and Recommended Models

Refined air quality models that are currently listed in Appendix W (PDF) and are required to be used for State Implementation Plan (SIP) revisions for existing sources and NSR and PSD programs.

Grants for your Region: Information that is specific to EPA Region 4

Detailed Region 4 grant information that you will need when applying for grants in Region 4.

BASINS Version History

Better Assessment Science Integrating Point and Nonpoint Sources (BASINS) version history shows the new features and changes to BASINS

BASINS User Information and Guidance

This page provides links to guidance on how to use BASINS, including the User’s Manual, tutorials and training, technical notes, case studies, and publications that highlight the use of BASINS in various watershed analyses.

RadNet Air Filter Analysis Results From New York City, NY

This page presents radiation air filter analysis data for New York City, NY from EPA's RadNet system. RadNet is a nationwide network of monitoring stations that measure radiation in air, drinking water and precipitation.