[5] Generally considered separate from one another, Fetters Hot Springs and Agua Caliente are adjacent communities located along the Sonoma Highway (State Route 12), approximately 2.5 miles (4.0 km) northwest of Sonoma, California, and immediately north of Boyes Hot Springs and El Verano.

Over time, the boundaries between these four communities became blurred and they are often grouped together and referred to collectively as "the Springs" area of Sonoma Valley.

The Mexican government deeded 50,000 acres to Lazaro Piña as Rancho Agua Caliente, a land grant 10 miles (16 km) long on the east side of Sonoma Creek, in 1840.

In 1849 Thaddeus M. Leavenworth acquired 320 acres of the Rancho in what became present-day Agua Caliente, Fetters Hot Springs, Boyes Hot Springs, and part of Maxwell Farm.

[7] In 1889, property was being sold in the area as being near the "celebrated old Indian Medicine Spring.

[9] Flamboyant restaurateur Juanita Musson opened her second Sonoma Valley restaurant in the old Fetters hotel around 1970, but it burned to the ground five years later.

[10] The land stood vacant for almost forty years until the Fetters Apartments, built as affordable housing for sixty families, opened in 2017.

There were 1,585 housing units at an average density of 1,076.9 per square mile (415.8/km2), of which 58.1% were owner-occupied and 41.9% were occupied by renters.

In the state legislature, Fetters Hot Springs-Agua Caliente is in the 2nd Senate District, represented by Democrat Mike McGuire,[14] and in the 4th Assembly District, represented by Democrat Cecilia Aguiar-Curry.

[15] Federally, Fetters Hot Springs-Agua Caliente is in California's 4th congressional district, represented by Democrat Mike Thompson.