Emergency medical services in the United States

In the United States, emergency medical services (EMS) provide out-of-hospital acute medical care and/or transport to definitive care for those in need. They are regulated at the most basic level by the federal government, which sets the minimum standards that all states' EMS providers must meet, and regulated more strictly by individual state governments, which often require higher standards from the services they oversee.

Wide differences in population density, topography, and other conditions can call for different types of EMS systems; consequently, there is often significant variation between the Emergency Medical Services provided in one state and those provided in another.

EMS delivery in the US can be based on various models. While most services are, to some degree, publicly funded, the factor which often differentiates services is the manner in which they are operated. EMS systems may be directly operated by the community, or they may fall to a third-party provider, such as a private company. The most common operating models in the U.S. include:

In one of the more common publicly operated models, an EMS system is operated directly by the municipality it services. The services themselves may be provided by a local government, or may be the responsibility of the regional (or state) government. Municipality-operated services may be funded by service fees and supplemented by property taxes. In many such cases, the EMS system is considered to be too small to operate independently, and is organized as a branch of another municipal department, such as the Public Health department. In small communities that lack a large population or tax-base, such a service may not be able to operate unless it is staffed by community volunteers. In these cases, the volunteer squad may receive some funding from municipal taxes, but is generally heavily reliant on voluntary donations to cover operating expenses. This provides a significant challenge for volunteer groups, since the training standards for staff must be met, and the vehicle and equipment standards adhered to, while the group does all or most of its own fundraising. Without the presence of dedicated volunteers, however, many small communities in America might be without local EMS systems and would either have no service at all or be forced to rely on service from more distant communities.

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