Welcome to EPA's implementation of the Common Alerting Protocol (CAP).
CAP is an open, non-proprietary digital message format for all types of
alerts and notifications. It is a simple but general format for
exchanging all-hazard emergency alerts and public warnings over all
kinds of networks. CAP allows a consistent
warning message to be disseminated simultaneously over many different
warning systems, thus increasing warning effectiveness while simplifying
the warning task.