Science & Technology
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TMDL Effectiveness Monitoring Data and Plans
A series of guides for TMDL effectiveness monitoring data and plans.
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Establishing Total Maximum Daily Load (TMDL) Wasteload Allocations (WLAs) for Storm Water Sources and NPDES Permit Requirements Based on Those WLAs
The memoranda clarify existing EPA regulatory requirements for, and provide guidance on, establishing wasteload allocations (WLAs) for storm water discharges in total maximum daily loads (TMDLs) approved or established by EPA.
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EPA Geospatial Metadata Style Guide using EME 5 and EME for Pro
This Style Guide provides recommendations and instructions for using EPA Metadata Editor Version 5 to create geospatial metadata conforming to numerous federal standards.
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2023 National Emissions Inventory (NEI) Technical Support Document (TSD)
Explains the sources of information in the inventory; show what sources of data used for each sector; and provide more information about the components.
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EPA-Approved Mojave Desert Air Quality Management District (AQMD) Regulations in the California SIP
Documents and tables containing EPA approved and compiled rules and regulations for the Mojave Desert Air Quality Management District (AQMD) portion of the California State Implementation Plan (SIP).
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Peer Review for Evaluating HHCB, phthalic anhydride, o-DCB, and p-DCB
Information about the EPA's Peer Review of the risk evaluation for octamethylcyclotetrasiloxane (D4) under the Toxic Substances Control Act.
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Lake Pontchartrain Basin Restoration Program
Lake Pontchartrain Basin Restoration Program Web Area
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Missoula Railyard Reduces Costs and Idling Emissions
This web page provides an overview of technology changes (installation of APUs on locomotives), and operational changes (establishing an idling policy) that resulted in significant reduction of air emissions and reduced costs.
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About EPA's Science Advisory Organizations
List of internal and external science advisory organizations
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Collection of Methods
Find the links to multiple approved environmental measurement methods, from both inside and outside the Agency. These links are organized by area of research.
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Challenges in Measuring Perfluorinated Compounds (PFCs)
This page provides links to ASTM methods for measuring PFCs in non-drinking water samples.
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Risk Assessment Guidance for Superfund (RAGS): Part E
EPA's Risk Assessment Guidance for Superfund (RAGS) Part E uses a consistent methodology for assessing the exposures from the dermal pathway for Superfund human health risk assessments.
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Dasymetric Toolbox
Dasymetric mapping is a geospatial technique that uses additional information, such as landcover types, to more accurately distribute data that has been assigned to arbitrary boundaries, such as census blocks.
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America's Children and the Environment Data Tables
America's Children and the Environment Data Tables
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CMAQ Models
The Community Multiscale Air Quality (CMAQ) model is a numerical air quality model that relies on scientific first principles to predict the concentration of airborne gases and particles and the deposition of these pollutants back to Earth’s surface.
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Guidance for Preparing Standard Operating Procedures, EPA QA/G-6 from March 2001
Provides guidance on the preparation and use of a standard operating procedure within a quality system.
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Guidance on Assessing Quality Systems EPA GA/G-3
Provides methods and tools for assessing quality systems and provides information about assessments for those who use them
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Clean Water Act Analytical Methods
The EPA publishes laboratory analytical methods (test procedures) that are used by industries and municipalities to analyze the chemical, physical and biological components of wastewater and other environmental samples required by the Clean Water Act.
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2018 AirToxScreen
Background information on AirToxScreen
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2017 AirToxScreen: Emissions Update Document
AirToxScreen emissions update document