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Soap Lake is a city in Grant County, Washington, on the shores of Soap Lake. The population was 1,514 at the 2010 census.
Soap Lake was officially incorporated on June 9, 1919.
This came to a halt during the Depression when drought hit Soap Lake. Because of the lack of water and the lack of money, the tourist trade dwindled. But, when Grand Coulee Dam was built, the irrigation canals brought new life into the area. Soap Lake has been internationally known during the past century for its uniquely mineral-rich (23) waters and mud. Many people believe the water and mud to be successful in treatment of a variety of ailments. From the early 1900s to the mid-1940s, there were a number of sanitariums located on Soap Lake.
These early versions of spas were used by visitors from all over the country and the world.