William J. Dingee (1854 – 1941), also known as “The Cement King,” was a shrewd real estate investor who built a fortune based on real estate holdings and water supply contracts. In order to supply his considerable property in the Oakland hills, Dingee established the Piedmont Spring and Water Company in 1891, which he reincorporated as the Oakland Water Company in 1893. The Oakland Water Company had a rivalry with the Contra Costa Water Company, of which Dingee was able to gain control in 1899.

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