National Library of Medicine

WebWISER is the online version of WISER, a system designed to assist first responders in hazardous material incidents. WISER provides a wide range of information on hazardous substances, including substance identification support, physical characteristics, human health information, and containment and suppression advice.


Chemical Hazards Emergency Medical Management (CHEMM) content was produced by the U.S. Department of Health and Human Services, Office of the Assistant Secretary for Preparedness and Response, Office of Planning and Emergency Operations, in cooperation with the National Library of Medicine, Division of Specialized Information Services, and many medical, emergency response, toxicology, and other types of experts.

Chemical reactivity data is provided by the Chemical Reactivity Worksheet (CRW) database, developed by the Emergency Response Division of the National Oceanic Atmospheric Administration and the Center for Chemical Process Safety (CCPS).

For more information, including free downloads of a standalone version of WISER for PCs and various mobile devices, please see the WISER home page.

WebWISER help is available in PDF and HTML formats. Select the format you wish to view:

For a listing of the data sources used by WISER, please see the WISER Data Sources.

WebWISER Version Information

Web Application:5.3.15
Web Services:5.3.12


The U.S. Government does not warrant or assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed.

It is not the intention of NLM to provide specific medical advice to the public, but rather to provide users with information to better understand their health.

NLM does not endorse or recommend any commercial products, process, or services.