As of June 7, 2019, 15 more agencies across the country have reported to the Federal Communications Commission (FCC) that they have successfully implemented Text-to-911 in the PSAP for their service areas.
FCC: Text-to-911 PSAP Master Registry
FCC rules require all wireless carriers and other providers of text messaging applications in the United States to deliver emergency texts to call centers that request them. If a call center requests text-to-911 service, text messaging providers must deliver the service in that area within six months. Text-to-911 provides direct access to citizens who are deaf, hard of hearing or speech impaired through wireless devices. However, the service also provides a means of reporting emergencies for those that are no unable to communicate via traditional voice call to 9-1-1. Such incidents as an active shooter or domestic violence incident where making a voice call may put the caller in jeopardy can still be communicated to the 9-1-1 PSAP to allow a much faster response.
PSAPs needing guidance to implement Text-to-911 service can find sample policies, implementation guides, use cases as well as educational materials from the National 911 Program Office by visiting 911.gov