PHMSA (U.S. Department of Transportation Pipeline and Hazardous Materials Safety Administration)'s 2020 Emergency Response Guidebook provides first responders with a go-to resource to help deal with hazmat accidents during the critical first 30 minutes.

The ERG contains an indexed list of dangerous goods and the associated ID number, the general hazards they pose and recommended safety precautions. For example, if emergency responders arrive at the scene of an overturned tractor trailer displaying a DOT hazmat placard, they would use the guide to identify the material associated with the placard and get guidance on how to respond accordingly.

The 2020 version of the ERG includes general revisions, reorganized general information pages, protective distance mapping updates, and the new ability to share data links through URLs. Updated every four years, the ERG is available free to public safety agencies in all states and territories through designated state coordinators’ offices. PHMSA has partnered with the National Library of Medicine to provide this free application as well as a version of the ERG in its Wireless Information System for Emergency Responders (WISER) application.

What’s New

Version 3.0.84

This release includes the full Emergency Response Guidebook 2020!

Sharing and collaboration is now available. Share data and protective distance maps with other mobile users.

Search functionality has been improved to make it more accurate and flexible.

Addressed issues with link sharing.

Many small updates and improvements have been implemented.

Ratings and Reviews

4.2 out of 5
36 Ratings

36 Ratings

Monty15 ,

Great tool!

Was easy to use and quicker than thumbing through the book. Would like to see the ability to drop the waypoint on the map when plotting isolation distances, currently you can only input addresses. Also, the text bubble used with the waypoint does not display entire text, even when screen is rotated on iPhone 7.

Timothy Chavez ,


Great app easy to use but a glossary feature would be a game changer

Scorned Murican ,

Missing links

When I search by un # the corresponding guide page has the “map”, “guide..”, “protective distance” tabs appear. If I go through the “browse guide pages” tab instead those tabs don’t appear on the guide page?

Developer Response ,

Material pages provide these options in context of the material (green page data is associated with specific materials). The guide page viewer does not provide these options. It is purely provided for direct browsing, much like the book.


National Library of Medicine
45.6 MB

Requires iOS 11.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Infrequent/Mild Alcohol, Tobacco, or Drug Use or References
Infrequent/Mild Medical/Treatment Information


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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