On 12 February 1983, the American oil company Texaco drilled 2,350 metres (7,710 ft) below ground, just outside the town of Erding, Bavaria, Germany. Instead of oil, they discovered sulfurous water. Initially a 'mini thermal bath complex' was constructed on the site, and then the foundation stone of Therme Erding was finally laid on 10 November 1998, and it was officially opened on 3 October 1999. The complex has a clothed bathing area, and a no-clothing sauna section. In 2007, Therme Erding underwent an expansion.

On 31 March 2007, the waterslide section "Galaxy" opened, making it one of the biggest indoor waterslide parks in Europe. The newly expanded "Saunaparadies" reopened the same day which, with an area of 12,900 square metres (139,000 sq ft), became the largest sauna complex in the world. Both these extensions meant that Therme Erding more than doubled in size, increasing from 70,000 to 145,000 square metres (750,000 to 1,560,000 sq ft). A section of the old sauna area was named the "Vital-Oase", and is now designated only for clothed use. The exclusive beauty section "Royal Day Spa" has been open since 1 March 2009. It also has an adjoining hotel connected to the complex. More than €100 million has been invested in the park since its inauguration, and more than 600 jobs have been created.