Although HazMAP is best implemented as a single system, it is sometimes better understood when viewed as two components:

1. The "Portal" - a customized website where businesses can login to complete and submit their hazardous materials business plans. Agencies can also review and approve the business plans through the portal.

2. The "Map Interface" - HazMAP is loaded onto computers (MDC/CAD) located in emergency response vehicles and command centers. The map interface interprets data contained in the portal and visually displays it for emergency responders. The map interface displays key features such as fire hydrants, storm drains, sewer lines, rivers, etc. It also gives responders access to chemical information and the abilities to perform chemical plume/WMD modeling and calculate protective action distances.