Águas de São Pedro
Recognizing the importance of the thermal springs in the region, the São Paulo State Government on 19 June 1940 founded the (Hydromineral and Climatic Spa of Águas de São Pedro). Despite this, the city celebrates its birthday on 25 July, the date in 1940 of the founding of the first major building in the city, the "Grande Hotel" (now "Grande Hotel São Pedro"). The municipality of Águas de São Pedro was incorporated by State Law No.233, of 24 December 1948.
San Pedro Springs
The springs were named by Father Isidro Félix de Espinosa, a Spanish missionary, in 1709; but some scholars believe Álvar Núñez Cabeza de Vaca may have camped at the springs in 1535. That would make the springs one of the oldest historical sites in North America and the second oldest park in America, behind only Boston Common.
In 1718 Governor Martín de Alarcón established a settlement he called Villa de Béxar near the headwaters of San Pedro Creek, but civilian settlement did not materialize. 
Also, in 1718, another Spanish missionary, Antonio de San Buenaventura y Olivares, built a mission nearby the fort at San Pedro Springs that he named San Antonio de Valero. This was the first permanent European settlement in San Antonio.