Volunteer fire department

A volunteer fire department (VFD) is a fire department composed of volunteers who perform fire suppression and other related emergency services for a local jurisdiction.

Volunteer firefighters contrast with career firefighters, who work full-time and receive a full salary. Some volunteer firefighters may be part of a combination fire department that employs both full-time and volunteer firefighters.

In some communities, the definition of a volunteer firefighter includes those who receive some pay for being on call and/or attending emergencies, known in other countries as "retained" firefighters. Volunteer and retained firefighters are expected to be on call to respond to emergency calls for long periods of time, and are summoned to the fire station when their services are needed. They are also expected to attend other non-emergency duties as well (training, fundraising, equipment maintenance, etc.).
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https://en.wikipedia.org/wiki/Volunteer_fire_department