Science & Technology
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e-Manifest Rulemakings and Policies
New e-manifest rulemaking page to replace existing basic information page.
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Evaluating Analytical Method Improvements for Six-Year Review of Drinking Water Standards
Learn about how EPA considers analytical method improvements for evaluating contaminants in drinking water
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Six-Year Review 1 Contaminant Occurrence Data (1993-1997)
EPA completed its first detailed contaminant occurrence analyses in 2003 for 69 regulated contaminants, using data provided by a national cross-section of 16 states.
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Drinking Water Distribution Systems
Learn about an overview of drinking water distribution systems, the factors that degrade water quality in the distribution system, assessments of risk, future research about these risks, and how to reduce cross-connection control risk.
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National Emission Standards for Hazardous Air Pollutants (NESHAP) Part 61 in Arkansas
National Emission Standards for Hazardous Air Pollutants (NESHAP) Part 61 in Arkansas.
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Other Rules in Arkansas
Other Rules in Arkansas
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Interim Final Guidance: Developing Risk-Based Cleanup Levels at Resource Conservation and Recovery Act Sites in Region 10
This guidance is intended for use by EPA Region 10 personnel and RCRA-regulated facilities undergoing corrective action or clean closures in Region 10 (Alaska, Idaho, Oregon, Washington).
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Swimming Beaches
An assessment of water quality trends at swimming beaches in the Salish Sea. Part of the U.S. EPA and Environment and Climate Canada's Health of the Salish Sea Ecosystem Report.
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Modeling Toxic Air Pollutants - CMAQ
The CMAQ system can be used to predict the concentration and deposition of many Hazardous Air Pollutants.
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CMAQ Metadata
The following documents describe annual adjusted Community Multi-scale Air Quality (CMAQ) deposition fields for the years 2002-2012 and for 2025.
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CMAQ Developers Guide
The CMAQ Developers Guide describes general development practices within the CMAQ system and directions on how to contribute source code to the EPA CMAQ GitHub repository.
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CMAQ Model Evaluation Framework
CMAQ is tested to establish the modeling system’s credibility in predicting pollutants such as ozone and particulate matter. Evaluation of CMAQ has been designed to assess the model’s performance for specific time periods and for specific uses.
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CMAQ User's Survey Results
The University of North Carolina's CMAS Center administered surveys in 2016 and 2018 of the CMAQ user community. Results show who uses CMAQ and how they’re applying it to their work.
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Incremental Evaluation of CMAQv5.3
The impact on model predicted pollutant concentrations of the major changes in the CMAQv5.2 system compared to the last are tested one at a time. Evaluation results are summarized for ozone and PM2.5 based on simulations of January and July 2011.
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Ruddiman Creek Completion Fact Sheet
Fact sheet of a joint effort between EPA and the Michigan Department of Natural Resources and Environment (now Michigan Dept. of Environmental Quality) the $13.5 million dredging and cleanup project for Ruddiman Creek and Ruddiman Pond.
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Webinar: Landfill Gas Electricity Power Purchase Agreement Ending Soon? Learn What You Can Do
LMOP webinar on June 13, 2023 about options for landfill gas electricity project owners with an expiring power purchase agreement.
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Data Validation Standard Operating Procedures for Organic Analysis
Describes standard operating procedures for organic analysis data validation.
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EPA Region 4 Data Validation Standard Operating Procedures for Contract Laboratory Program Routine Analytical Services
This page contains basic information and links for standard operating procedures for contrat laboratory program routine analytical services for both organic and inorganic compounds
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Known Issues, Data Notes, and Revisions
Detailed List of Corrections to eGRID data
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Estuary Data Mapper (EDM) Special Topics and Videos
This page links out to several use cases, tutorial videos, and specific applications of Estuary Data Mapper that may be of interest to the advanced EDM user.