Science & Technology

Understanding Lead Pipes and Water Filters: Supporting Communities in Reducing Lead Exposure

EPA researchers and community partners collaborated on a research project to address knowledge gaps and provide comprehensive resources to help community members properly use and maintain water filters.

WEDNESDAY: EPA to join state and local officials in marking the one-year anniversary of Hurricane Helene in and around Lake Lure, North Carolina

Release Date: September 15, 2025

EPANET

Software that models the hydraulic and water quality behavior of water distribution piping systems.

eCDRweb User Guide–Secondary Support

This document presents the user guide for the Office of Pollution Prevention and Toxics’ (OPPT) e-CDR web tool. E-CDRweb is the electronic, web-based tool provided by the Environmental Protection Agency (EPA) for the submission of Chemical Data Reporting (CDR) information. This document is the user guide for the Secondary Support user of the e-CDRweb tool.

e-CDRweb User Guide – Secondary Authorized Official

This document presents the user guide for the Office of Pollution Prevention and Toxics’ (OPPT) e-CDRweb tool. E-CDRweb is the electronic, web-based tool provided by the Environmental Protection Agency (EPA) for the submission of Chemical Data Reporting (CDR) information. This document is the user guide for the Secondary Authorized Official (AO) user of the e-CDR web tool.

XML Schema Guide for Primary CDR Submissions

This document presents the extensible markup language (XML) schema guide for the Office of Pollution Prevention and Toxics’ (OPPT) e-CDRweb tool. E-CDRweb is the electronic, web-based tool provided by Environmental Protection Agency (EPA) for the submission of Chemical Data Reporting (CDR) information. This document provides the user with tips and guidance on correctly using the version 1.7 XML schema. Please note that the order of the elements must match the schema.

Characterization and Mitigation of Combustion Sources Research

EPA is working to characterize the chemical and physical properties of emissions from combustion sources (including industry, transportation, and household energy) to support policy decisions that improve air quality, public health, and the environment.

eCDRweb User Guide–Primary Authorized Official

This document presents the user guide for the Office of Pollution Prevention and Toxics’ (OPPT) e-CDRweb tool. E-CDRweb is the electronic, web-based tool provided by the Environmental Protection Agency (EPA) for the submission of Chemical Data Reporting (CDR) information. This document is the user guide for the Primary Authorized Official (AO) user of the e-CDR web
tool

Framework for Conducting Pesticide Drinking Water Assessments for Surface Water

EPA developed this framework to document the long- standing practices that the Office of Pesticide Programs uses to conduct drinking water assessments for conventional pesticides in surface water.

Biothreat Agent Detection: Advances in Rapid Analytical Methods Webinar

EPA's ORD offers free public webinars on recent research results. Watch a pre-recorded webinar covering research on development of Rapid Viability PCR (RV-PCR) methods, which can determine the presence or absence of live biothreat agents.

Biological Fate & Transport

Understanding a biological agent’s ability to persist in the environment and the various transport pathways such as rain and stormwater that can redistribute a biological contaminant would help authorities properly assess and respond.

Publications

Links and information on EPA publications and resources.

Access CMAQ Source Code

Access CMAQ source code, step-by-step instructions for downloading the CMAQ base model, and guidance on building the two-way CMAQ system.

CMAQ Documentation

Find the release notes for recent versions of the model system, a CMAQ User's Guide, and helpful tutorials on common tasks.

Technical Amendments to Procedure 6 - Final Rule

EPA published Procedure 6, which is a companion to Performance Specification 18.

Approval of New Testing Procedures for Measurement of Stack Gas Flow Rate for Optional Application in Place of Method 2 under 40 CFR Parts 60, 61, and 63

memo for use of method 2f,2g,2h

Summary of Comments on Test Methods Amendments Proposed in the Federal Register on August 27, 1997

(EPA) proposed amendments to 40 CFR Parts 60, 61, and 63 to reflect miscellaneous editorial changes and technical corrections throughout the parts in sections pertaining to source testing or monitoring of emissions and operations and added Performance Spec