• System Of Registries
• The System of Registries (SoR) is a resource for environmental system developers and enterprise architects. It also provides environmental program managers and users of environmental information with automated services to enable better understanding of environmental terminology and data used by the Agency.
• Data standards are an integral part of these services. Information about data standards may be accessed on the separate Data Standards Web Site.
• Terminology Services
• Disclaimer: The definitions provided in Terminology Services do not constitute the Agency’s official use of terms and phrases for regulatory purposes, and should not be used to alter or supplant those found in any other federal document. Official terminology may be found in the laws and related regulations as published in such sources as the Congressional Record and Federal Register.
• Users may search on all approved terms and acronyms stored in Terminology Services. Users may: 
• Enter a term to search for and select a search mode (Contains is the default).
• Select a Search by Type (Terms and Acronyms is the default).
• Browse by a numerical range or alphabetical letter.
• Terms & Acronyms used by EPA
• The definitions provided in Terminology Services do not constitute the Agency’s official use of terms and phrases for regulatory purposes, and should not be used to alter or supplant those found in any other federal document. Official terminology may be found in the laws and related regulations as published in such sources as the Congressional Record and Federal Register.
• Users may search on all approved terms and acronyms stored in Terminology Services. Users may: 
• Enter a term to search for and select a search mode (Contains is the default).
• Select a Search by Type (Terms and Acronyms is the default).
• Browse by a numerical range or alphabetical letter.
• Laws and Regulations Services
• Laws and Regulations Services (LRS) is a catalog of environmental laws and regulations and associated data that is publicly available via web services. LRS is a component of the EPA’s System of Registries. LRS associates law and regulation data with keywords, NAICS codes, EPA programs and offices, and substance lists from the Substance Registry Service (SRS). Laws and regulation data in LRS is extracted from the Code of Federal Regulations (CFR), published by the Government Publishing Office (GPO). LRS provides links to the official U. S. Code (U.S.C.) and CFR publications on the GPO website.
• TRIBES Services / Tribal Identifier Data Standard
• The Tribal Identifier Data Standard is an EPA data standard that requires Agency systems with tribal information to maintain accurate and current references to the Bureau of Indian Affairs (BIA) recognized American Indian and Alaska Native tribal entities. This includes the tribe’s name, state location(s), EPA region, BIA Code, and EPA Internal Identifier. Implementing this data standard increases EPA’s ability to exchange and integrate tribal data, helping the agency coordinate and work with our tribal partners.
• Registry of EPA Applications, Models and Data Warehouses (READ)
• READ is an important tool for improving EPA’s ability to manage its information resources. Having an accurate inventory of which information resources exist at EPA, which EPA Program Office or Region owns that resource, and who the contact is for the resource, is a first step in effective management.
• READ takes this management a step further by collecting life cycle phase information, how the resource supports environmental statutes, and whether the resource interfaces with other EPA information resources. READ facilitates a more enterprise-wide understanding of how information resources support the EPA mission. In an effort to streamline the reporting process, READ has been integrated into the EPA’s governance process. Through this integration, EPA maintains a single resource title, acronym, and other information that is common across various reporting processes.
• Source Classification Codes (SCCs)
• This is a searchable database containing the most updated SCCs list. You can do a keyword search by typing in a search term in the box below. You can also filter your search by clicking on the filter options to make a selection from the menu. Learn more about SCCs and how they are structured.
• Consolidated List of Lists
• Consolidated List of Lists
• EPA’s Substance Registry Services (SRS) database can be used to search for a specific chemical name or Chemical Abstract Service (CAS) registry number. It provides the regulations and statutes applicable to the chemical. Regulatory lists include those managed by EPA and other federal agencies and states. SRS can also be searched by a specific regulatory list and shows all the chemicals on that particular list.
• Purpose
• The List of Lists is a consolidated list of chemicals subject to:
• Emergency Planning and Community Right-to-Know Act (EPCRA);
• Comprehensive Environmental Response, Compensation and Liability Act (CERCLA); and
• Section 112(r) of the Clean Air Act (CAA).
• It was prepared to help facilities handling chemicals determine, for a specific chemical, whether they may be subject to certain reporting requirements. These lists should be used as a reference tool, not as a definitive source of compliance information. Please refer to the following requirements in the appropriate part of the Code of Federal Regulations (CFR):
• Emergency planning notification under EPCRA section 302 (40 CFR Part 355);
• Emergency release notification under EPCRA section 304 (40 CFR Part 355);
• Toxic chemical release reporting under EPCRA section 313 (40 CFR Part 372);
• Hazardous substances release notification under CERCLA sections 102-103 (40 CFR Part 302); and
• Accidental release prevention requirements under CAA 112(r) (40 CFR Part 68).
• Formats
• The List of Lists is available in in the following formats:
• EPCRA/CERCLA/CAA §112(r) Consolidated List of Lists (pdf) (3.09 MB, December 2022)
• Changes to EPCRA/CERCLA/CAA §112(r) Consolidated List of Lists (pdf) (177.86 KB, December 2022)
• Microsoft Excel version of EPCRA/CERCLA/CAA §112(r) Consolidated List of Lists (xlsx) (218.48 KB, December 2022)
• Free Viewers
• Please note that the Excel file does not contain:
• Introductory material explaining the lists and codes used in the chemical tables;
• Appendix B: Radionuclides listed under CERCLA;
• Appendix D: Toxics Release Inventory (TRI) chemical categories; or
• Appendix F: CERCLA hazardous substance chemical categories.
• All appendices appear in the PDF version of the List of Lists.

• Office of Research and Development (ORD)
• Risk Assessment
• While there are many definitions of the word risk, EPA considers risk to be the chance of harmful effects to human health or to ecological systems resulting from exposure to an environmental stressor.
• A stressor is any physical, chemical, or biological entity that can induce an adverse effect in humans or ecosystems. Stressors may adversely affect specific natural resources or entire ecosystems, including plants and animals, as well as the environment with which they interact.
• Human Health Risk Assessment
• A human health risk assessment is the process to estimate the nature and probability of adverse health effects in humans who may be exposed to chemicals in contaminated environmental media, now or in the future.
• Ecological Risk Assessment
• An ecological risk assessment is the process for evaluating how likely it is that the environment might be impacted as a result of exposure to one or more environmental stressors, such as chemicals, land-use change, disease, and invasive species.
• Stressors and the Offices that manage them
• Air Pollution

• • • • • Office of Air and Radiation

• Hazardous substances, pollutants, and waste

• • • • • Office of Solid Waste and Emergency Response

• Herbicides

• • • • • Office of Chemical Safety and Pollution Prevention

• • • • • Office of Research and Development

• Pharmaceuticals

• • • • • Office of Chemical Safety and Pollution Prevention

• • • • • Office of Research and Development 

• • • • • FDA’s Center for Drug Evaluation and Research

• Pesticides

• • • • • Office of Pesticide Programs

• • • • • U.S. Consumer Product Safety Commission (toys and other consumer products)

• • • • • FDA’s Center for Food Safety and Applied Nutrition

• Radiation including radon

• • • • • Radiation Programs

• Toxic substances, human exposure, environmental exposure

• • • • • Office of Chemical Safety and Pollution Prevention

• • • • • Office of Research and Development

• Vaccines

• • • • • FDA’s Center for Biologics Evaluation and Research

• Water pollution

• • • • • Office of Water

• EPA Laboratories and Research Centers
• EPA’s Office of Research and Development Research Centers develop knowledge, assessments, and scientific tools that form the underpinnings of the vast majority of EPA’s protective standards and guidance.

• Exploratory Tools
• Standards, Plans, and Reports
• Federal Data Standards
• Planning Documents
• Progress Reports
• Data Centers
• Contact EPA
• EPA Hotlines
• EPA Program and Regional Offices
• We have ten Regional offices, each of which is responsible for the execution of our programs within several states and territories. To get information about activities in your Regional office, select the appropriate link.
• RSEI Data Dictionary

This set of tables describes all of the data tables and fields used in EPA’s Risk-Screening Environmental Indicators (RSEI) model and results data sets. Each table listed below comes with information about where it can be found (e.g., in EasyRSEI, or in the Geographic Microdata).

• Airnow.gov
• Airnow Maps and Data
• Fire
• Information on what to do to prepare, during, and after fire as well as a fire map. Additional resources linked as well.
• U.S. Embassies and Consulates
• AirNow DOS collects Air Quality Monitoring data from U.S. embassies and consulates around the world to inform U.S. personnel and citizens overseas. Is your country interested in air quality monitoring? Check out AirNow International, the EPA’s information package on how to set up a country-wide air quality monitoring program.
• Air Quality Interactive Map
• This map includes data for air quality monitors in the U.S., Canada, and Mexico. All readings are preliminary, unvalidated, and subject to change. Select a tab for: Current, Forecast, Loops, or Archive.
• Air Data: Air Quality Data Collected at Outdoor Monitors Across the US
• The AirData website gives you access to air quality data collected at outdoor monitors across the United States, Puerto Rico, and the U. S. Virgin Islands. The data comes primarily from the AQS (Air Quality System) database. You can choose from several ways of looking at the data:
• download data into a file (or view it on the screen)
• output the data into one of AirData’s standard reports
• create graphical displays using one of the visualization tools
• investigate monitor locations using an interactive map
• AirData assists a wide range of people, from the concerned citizen who wants to know how many unhealthy air quality days there were in his county last year to air quality analysts in the regulatory, academic, and health research communities who need raw data.
• AirData lets you display and download monitored hourly, daily, and annual concentration data, AQI data, and speciated particle pollution data. For more detailed information on the AQS and the AirData source information, you can refer to the About AQS Data page.  If you need data that AirData does not have (such as emissions data) please see Other Sources of Data.
• EPA Outdoor Air Quality Data
• Use the tools on this site to access recent and historical data. For current air quality, visit AirNow.gov. During fire events, use the Fire and Smoke map.
• Download Data
• Data Viz Tools
• Summary Reports
• Monitor Locations
• About Air Data
• Technical Reports
• Interactive Map of Air Quality Monitors
• The AirData Air Quality Monitors app is a mapping application available on the web and on mobile devices that displays monitor locations and monitor-specific information.  It also allows the querying and downloading of data daily and annual summary data. 
• Map layers include:
• Monitors for all criteria pollutants (CO, Pb, NO2, Ozone, PM10, PM2.5, and SO2)
• PM2.5 Chemical Speciation Network monitors
• IMPROVE (Interagency Monitoring of PROtected Visual Environments) monitors
• NATTS (National Air Toxics Trends Stations)
• NCORE (Multipollutant Monitoring Network)
• PAMS (Photochemical Assessment Monitoring Stations)
• Near road monitors
• Nonattainment areas for all criteria pollutants
• Tribal areas
• Federal Class I areas (national parks and wilderness areas)
• Air Data – Daily Air Quality Tracker
• Compare daily AQI values for any year with the 20-year high and low (2000-2019) and the five-year average (2015-2019).  You can also generate a one-page PDF report for 2020.
• Air Data – Multiyear Tile Plot
• Plot daily AQI values for a specific location and time period. Each “tile” represents one day of the year and is color-coded based on the highest daily AQI value at the selected monitor – or among all monitors in the geographic area if “All Sites (Highest Daily AQI)” is selected.
• Air Data – Tile Plot
• Plot daily AQI values for a specific location and time period. Each square or “tile” represents one day of the year and is color-coded based on the highest daily AQI value at the selected monitor – or among all monitors in the geographic area if “All Sites (Highest Daily AQI)” is selected. The legend tallies the number of days in each AQI category.
• Air Data – AQI Plot
• Compare AQI values for multiple pollutants for a specific location and time period. This tool displays an entire year of AQI values – two pollutants at a time – and is useful for seeing how the number of unhealthy days can vary throughout the year for each pollutant.
• Air Data – Concentration Plot 
• This tool displays daily air quality summary statistics for the criteria pollutants by monitor. You can plot all monitors in a city or county, or you can select a specific monitor.
• Air Data – Concentration Map
• Make a map of daily concentrations over several days. The daily air quality can be displayed in terms of the Air Quality Index or in concentration ranges for certain PM species like organic carbon, nitrates, and sulfates. This tool may be useful for tracking an air pollution episode like a wildfire event.
• Air Data – Ozone Exceedances
• How does this year compare with previous years? Compare 8-hour ozone exceedances between two years or multi-year periods for a city or county. The first plot shows the comparisons by MONTH. The second plot shows the comparisons by DAY based on cumulative counts. The third plot shows the comparisons by YEAR.
• P2 EJ Facility Mapping Tool
• The P2 EJ Facility Mapping Tool helps prospective P2 grant applicants, grantees and interested stakeholders geographically target facilities in or adjacent to underserved communities within the framework of the P2 program’s five industrial sector-based National Emphasis Areas (NEAs). The tool allows users to identify industrial facilities that may be contributing to pollution levels in a selected area, including communities with environmental justice (EJ) concerns.
• Pollution Prevention (P2) Environmental Justice (EJ) Facility Mapping Tool

• EJScreen
• EJScreen is a tool that provide a great deal of information, based on data sources and methods that have been fully described in great detail in the EJScreen Technical Documentation, which is the most comprehensive source of information about EJScreen. For those simply wanting to learn how to start using the maps and reports, we have also provided a User Guide that walks through the steps involved. A fact sheet and list of common questions and answers are also available.
• Overview of Socioeconomic Indicators in EJScreen
• EJScreen uses socioeconomics factors as very general indicators of a community’s potential susceptibility to the types of environmental factors included in this screening tool, as explained further in the EJScreen Technical Documentation) . EJScreen has been designed in the context of EPA’s EJ policies, including EPA’s Final Guidance on Considering Environmental Justice During the Development of an Action (U.S. EPA, 2010). That guidance document explained EPA’s focus on socioeconomics as an indicator of potential susceptibility to environmental pollution.
• Overview of Environmental Indicators in EJScreen
• EJScreen provides 12 environmental indicators. It is important to understand what each of these is measuring or indicating, in order to use EJScreen appropriately. There are important caveats and limitations to these screening-level indicators and anyone using EJScreen is encouraged to read these carefully.
• Read more information about Environmental Indicators, including documentation of data sources, in the EJScreen Technical Documentation .
• Some of these environmental indicators quantify proximity to and the numbers of certain types of potential sources of exposure to environmental pollutants, such as nearby hazardous waste sites or traffic. The lead paint indicator indicates the presence of older housing, which often, but not always, indicates the presence of lead paint, and therefore the possibility of exposure. In some cases, the term “exposure” is used very broadly here to refer to the potential for exposure. Others indicators in EJScreen are estimates of ambient levels of air pollutants, such as PM2.5, ozone and diesel particulate matter. Still others are actual estimates of air toxics-related cancer risk or a hazard index, which summarizes the ratios of ambient air toxics levels to health-based reference concentrations. In other words, these environmental indicators vary widely in what they indicate.

• Cleanups in My Community
• Cleanups in My Community (CIMC) enables you to map and list hazardous waste cleanup locations and grant areas, and drill down to details about those cleanups and grants and other, related information.
• Clean-ups in My Community Mapping Tool
• Cleanups in My Community (CIMC) enables you to map and list hazardous waste cleanup locations and grant areas, and drill down to details about those cleanups and grants and other, related information.  This page provides several ways to get started.
• Underground Storage Tank (UST) Finder
• UST Finder allows users to find UST facilities and LUST sites, resulting in better understanding and assessment of vulnerability to human health and the environment. The map and application provide users with geospatial information about UST facilities and LUST sites that may be subject to extreme weather events, such as floods, wildfires, and earthquakes.
• More UST Info

• MyEnvironment
• The MyEnvironment search application is designed to provide a cross-section of environmental information based on the user’s location.

• EnviroAtlas
• EnviroAtlas provides geospatial data, easy-to-use tools, and other resources related to ecosystem services, their chemical and non-chemical stressors, and human health. 
• EnviroAtlas was developed collaboratively by EPA in partnership with the U.S. Geological Survey (USGS), the U.S. Department of Agriculture (USDA), and other federal and non-profit organizations, universities, and communities including state, county, and city-level stakeholders.
• EnviroAtlas provides data at the U.S. national extent and at higher resolution for selected populated places. 
• Most maps at the national extent provide wall-to-wall data coverage for the contiguous U.S. as well as some data for Alaska, Hawaii, Puerto Rico and the Virgin Islands. 
• Finer-scale data for selected populated places in EnviroAtlas draw from meter scale urban land cover data, census data, and models.  
• EnviroAtlas Eco-Health Relationship Browser
• The Eco-Health Relationship Browser illustrates scientific evidence for linkages between human health and ecosystem services. 
• This interactive tool provides information about several of our nation’s major ecosystems, the services they provide, and how those services, or their degradation and loss, may affect people.
• View the Browser demo video or read our fact sheet to get a brief introduction to the Browser’s components and navigation.

• WATERS (Watershed Assessment, Tracking & Environmental Results System)
• The Watershed Assessment, Tracking & Environmental Results System (WATERS) unites water quality information previously available only from several independent and unconnected databases.
• The data architecture of WATERS integrates information from various EPA water programs by linking it to the national surface water network. For EPA, the surface water network is based on the NHDPlus dataset which incorporates the best features of the National Hydrography Dataset (NHD) , the National Elevation Dataset (NED) , and the Watershed Boundary Dataset (WBD) . The integration of water program data using NHDPlus improves communication and efficiency which empowers EPA to meet its goals under the Clean Water Act.
• Using WATERS, environmental professionals and interested citizens can access comprehensive information about the quality of the nation’s surface water. Available information includes but is not limited to:
• designated use(s) of a waterbody;
• water quality monitoring results;
• assessments of water quality;
• causes and sources of impaired waters;
• public beach closures; and
• location of dischargers.
• Tool Link
• WATERS integrates water-related information by linking it to the NHDPlus stream network. The National Hydrography Dataset Plus (NHDPlus) provides the underlying geospatial hydrologic framework that supports a variety of network-based capabilities including upstream/downstream search and watershed delineation.
• Drinking Water Mapping Application to Protect Source Waters (DWMAPS)
• DWMAPS is an online mapping tool to help you find information critical to protection drinking water sources.
• Drinking Water Mapping Application to Protect Source Waters (DWMAPS)
• Safe Drinking Water Information System (SDWIS) Search
• The Safe Drinking Water Information System (SDWIS) contains information about public water systems and their violations of EPA’s drinking water regulations. These statutes and accompanying regulations establish maximum contaminant levels, treatment techniques, and monitoring and reporting requirements to ensure that water provided to customers is safe for human consumption.

• Smart Location Mapping
• The Smart Location Database is a nationwide geographic data resource for measuring location efficiency. It includes more than 90 attributes summarizing characteristics such as housing density, diversity of land use, neighborhood design, destination accessibility, transit service, employment, and demographics. Most attributes are available for every census block group in the United States.
• Access to Jobs and Workers Via Transit
• Several indicators measuring access to jobs and workers within a 45-minute transit ride for census block groups where transit data is available.
• National Walkability Index
• EPA’s National Walkability Index: provides walkability scores based on a simple formula that ranks selected indicators from the Smart Location Database that have been demonstrated to affect the propensity of walk trips. The dataset covers every block group in the nation, providing a basis for comparing walkability from community to community. This dataset’s universal coverage at the block group level makes it easy to use as input into scenario planning, modeling, and other community analysis. The National Walkability Index dataset ranks each block group relative to all other block groups in the United States, but individuals can use downloadable data to construct an index for a smaller universe of block groups, like a state, metropolitan area, or city.
• Smart Location Calculator
• The Smart Location Calculator is a simple tool for exploring how workplace location affects worker commute travel. Indicators include worker commute mode-share, vehicle miles traveled, and workplace accessibility via transit. The data and research behind this tool, as well as a user guide, are available in the Resources section at the bottom of the page.
• The Calculator provides a Smart Location Index (SLI), which ranges in value from 0-100, where 0 indicates the least location efficient site in the region, and 100 indicates the most location efficient site. These scores are relative to the region, and should not be compared across regions.
• NEPAssist
• NEPAssist is a tool that facilitates the environmental review process and project planning in relation to environmental considerations. The web-based application draws environmental data dynamically from EPA’s Geographic Information System databases and web services and provides immediate screening of environmental assessment indicators for a user-defined area of interest. These features contribute to a streamlined review process that potentially raises important environmental issues at the earliest stages of project development.

• Geospatial Viewer
• The functionality of the Geospatial Viewer has been enhanced and incorporated into the more capable FRS Query. A new option, Facility Coordinates, has been added to the list of available Reports displayed for facilities meeting the entered search criteria.
• Power Plants
• Power Plants and Neighboring Communities Mapping Tool
• There are over 3,400 fossil fuel-fired power plants in the United States. For each plant, EPA summarized population percentages of six key demographics and demographic index for the neighboring communities located within three miles of each plant.
• A three-mile radius is consistent with environmental justice literature and studies, including the EJ Screening Report for the Clean Power Plan. These key demographics and information about nearby power plants may help identify a community’s potential vulnerability to environmental concerns.
• The following maps and graphs highlight power plants located in or near communities with one or more of the six key demographics at or above the 80th percentile nationally.
• Power Plant Retirements 2019-2030 
• These interactive maps and graphs shows recent and announced retirements of coal, natural gas, oil, and other fuel combustion power plants. The color of the marker indicates fuel type and the marker size represents nameplate capacity (MW) of the retired power plant or unit.
• Power Profiler
• In the United States, electricity is generated in many different ways, with a wide variation in environmental impact. Electricity generation from the combustion of fossil fuels contributes toward unhealthy air quality, acid rain, and global climate change. Many electricity customers can choose their provider of electricity or can purchase green power from their utility. In fact, you might now have the option of choosing cleaner, more environmentally-friendly sources of energy. To compare the fuel mix (i.e., resource mix) and air emission rates of the electricity in your region to the national average and to determine the air emissions that result from electricity use in your home or business, either select the appropriate eGRID subregion or enter your ZIP code to determine the appropriate eGRID subregion. Power Profiler does not provide information about the environmental attributes of electric power generated by individual companies. For company-specific information, access EPA’s eGRID database.
• Participatory Science for Environmental Protection Map
• Participatory science (PS) engages the public in advancing scientific knowledge by formulating research questions, collecting data, and interpreting results. Other terms include citizen science, community science, or public participation in scientific research. EPA supports these initiatives through a range of resources including funding, technical support, and tools.
• Integrated Climate and Land-Use Scenarios (ICLUS)
• The Integrated Climate and Land-Use Scenarios (ICLUS) project produced spatially explicit projections of population and land-use that are based on Intergovernmental Panel on Climate Change’s (IPCC) scenarios and pathways.
• First, social, economic, and demographic storylines were adapted for the United States. These modified storylines were then used to create population projections that would reflect different assumptions about fertility, mortality, and immigration through the end of this century.
• Next, a spatial interaction model was used to simulate the annual movement of people within the United States. Then the results of these population projections are used to calculate the demand for new residential lands.

• Office of Mission Support
• Environmental Dataset Gateway
• The Environmental Dataset Gateway (EDG) provides a one-stop to discover and access EPA’s Open Data resources. The EDG contains metadata records contributed by EPA Regions, Program Offices, and Research Laboratories that links to geospatial and non-geospatial resources (e.g., data, Web services, or applications). Unrestricted information that is contributed to the EDG is shared with Data.gov.
• EPA Open Data Portal
• Explore the public data repositories to view or download datasets curated by the EPA.
• Envirofacts Data Breakdown
• `Comprehensive data breakdown of Envirofacts.

• EPA Geospatial Applications
• EPA has developed many applications that allow users to explore and interact with geospatial data. This page highlights some of the flagship geospatial web applications but these represent only a fraction of the total. We recommend EPA’s Environmental Dataset Gateway and GeoPlatform Gallery as the best tools to help connect you with an application that best meets your needs.
• We recommend EPA’s Environmental Dataset Gateway and GeoPlatform Gallery as the best tools to help connect you with an application that best meets your needs.

• UV Index Search
• The ozone layer shields the Earth from harmful ultraviolet (UV) radiation. Ozone depletion, as well as seasonal and weather variations, cause different amounts of UV radiation to reach the Earth at any given time. The UV Index predicts the ultraviolet radiation levels on a 0-10+ scale, helping people determine appropriate sun-protective behaviors.
• EPA’s Portfolio Manager (PM) – Water Module
• Getting Started: Portfolio Manager – Water Module
• EPA’s ENERGY STAR Portfolio Manager (PM)is a publicly available tool you can use to measure and track energy and water consumption, as well as greenhouse gas emissions, with an ENERGY STAR score generated for wastewater facilities larger than 0.6 million gallons per day. You can compare three publicly available energy data tools in the Data Tool Comparison Matrix, included in DOE’s Wastewater Energy Management Toolkit. If you have elected to use ENERGY STAR PM for your energy data management, this reference sheet helps you set a baseline, create a record, and find user help fromEPA.
• MOVES and Other Mobile Source Emissions Models
• EPA’s MOtor Vehicle Emission Simulator (MOVES) is a state-of-the-science emission modeling system that estimates emissions for mobile sources at the national, county, and project level for criteria air pollutants, greenhouse gases, and air toxics. 
•  AVoided Emissions and geneRation Tool (AVERT)
• AVERT is a free tool with a simple user interface designed to meet the needs of state air quality planners and other interested stakeholders. Anyone can use AVERT to evaluate county, state, and regional changes in emissions from electric power plants and displaced fuel-burning vehicles resulting from energy policies and programs such as energy efficiency, renewable energy, and electric vehicles. AVERT is designed to use public data that are accessible and auditable.
• Who Should Use AVERT
• Analysts who wish to improve their understanding of the emission benefits of statewide or multi-state energy policies and programs.
• Environmental agency staff and state air quality planners interested in assessing emission benefits being incorporated into Clean Air Act plans to meet the National Ambient Air Quality Standards or other clean air goals.
• Energy office or public utility commission staff who want to estimate and promote the air quality benefits of their energy efficiency, renewable energy, or electric vehicle policies.
• Air Pollutant Emissions Trends Data
• Current emission trends data (including “readme” files included in the spreadsheets) and the documentation of estimation methods are available via the links below. The latest version of the 1970 – 2022 data show the trends for Tier 1 categories which distinguish pollutant emission contributions among major source types.  Improvements to the methods used to estimate emissions for the years 2002-2019 are included in these data. These updated procedures will minimize the effects of method changes on emissions over this time frame. In addition, 2020 is represented by the 2020 NEI data, and 2021 and 2022 are based on the 2020 NEI with some year specific embellishments for point sources, fires, and mobile sources. Another addition to the suite of trends products includes EIS sector specific national and state trends for the time frame 2002-2022, and the addition of black carbon and organic carbon as pollutants to all the files. The trends shown are for criteria air pollutants (CAPs) and precursors covered by the National Ambient Air Quality Standards (NAAQS), excluding lead.  Lead emissions sharply declined after it was eliminated from gasoline and have remained low.
• Emissions & Generation Resource Integrated Database (eGRID)
• The Emissions & Generation Resource Integrated Database (eGRID) is a comprehensive source of data from EPA’s Clean Air Markets Division on the environmental characteristics of almost all electric power generated in the United States.
• The data includes emissions, emission rates, generation, heat input, resource mix, and many other attributes. eGRID is typically used for greenhouse gas registries and inventories, carbon footprints, consumer information disclosure, emission inventories and standards, power market changes, and avoided emission estimates.
• EIS Bridge Tools
• The Bridge Tools (Facility/Point, Nonpoint/Onroad/Nonroad, and Event) are available to State/Local/Tribal agencies for reporting NEI datasets to the Emissions Inventory System.  The bridge tools create XML datasets from Access database templates.  Data can also be imported from the XML format into these Access templates.
• EIS Reporting Code Tables
• WARNING: Prompts File Download. EIS Reporting Code Tables (zip) is a zip file containing the different point source reporting codes used to report facility and emissions data in both xls and csv formats. A readme file is also included.
• Webfire
• WebFIRE is EPA’s online emissions factor repository, retrieval, and development tool. The WebFIRE database contains EPA’s recommended emissions factors for criteria and hazardous air pollutants (HAP) for industrial and non-industrial processes. In addition, WebFIRE contains the individual data values used to develop the recommended factors and other data submitted to EPA by federal, state, tribal, and local agencies; consultants; and industries. For each recommended emissions factor and individual data value, WebFIRE contains descriptive information such as industry and source category type, control device information, the pollutants emitted, and supporting documentation.
• WebFIRE includes data submitted to EPA from the Electronic Reporting Tool (ERT). Beginning January 1, 2012, industries are required to submit their source test data to EPA using the ERT application. This information is shared with WebFIRE and is available to the public. More information about the ERT data is available on the Search WebFIRE page.
• Support Center for Regulatory Atmospheric Modeling (SCRAM)
• This website provides access to air quality models and other mathematical simulation techniques used in assessing control strategies and source impacts.

• The Wastewater Information System Tool (TWIST)
• The Wastewater Information System Tool (TWIST) is downloadable, user-friendly management tool that will allow state and local health departments to effectively inventory and manage small wastewater treatment systems in their jurisdictions. It is designed to track information related to homes and facilities served, permits, site evaluations, types of systems, inspections and complaints. TWIST will help answer key questions for public health and water resource program managers, such as:
• How many systems near drinking water sources have not been maintained?
• Are there systems older than 35 years sited closer than 50 feet from the lake shore?
• Which systems require inspection within the next year?
• How many systems of similar types have malfunctioned over the last three years?
• Information Collection Rule (ICR)
• ICR required water systems serving 100,000 people or more to collect samples and report on microbial (source water) and disinfection byproduct (treated water) levels for 18 months (July 1997-December 1998), as part of a national research project to support development of national drinking water standards.
• EPA’s Energy Use Assessment Tool 
• EPA’s Energy Use Assessment Tool: An Excel-based tool that small- to medium-sized systems can use to conduct a utility bill and equipment analysis to assess individual baseline energy use and costs.
• Getting Started: Energy Use Assessment Tool