California Water Service | Company Profile - Revenue, Headcount, Tech Stack, Contacts

Updated February 10, 2026

Industry & Market

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Funding Information

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Headcount Distribution

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Overview

California Water Service is the largest regulated water utility west of the Mississippi River and the third largest in the United States. Established in 1926 and based in San Jose, it serves approximately 1.8 million people through about 497,700 customer connections across over 100 communities in more than 25 districts throughout California.

As a subsidiary of California Water Service Group, it focuses on providing high-quality regulated water and wastewater services. Core services include production, storage, treatment, and distribution of water for domestic, commercial, and irrigation uses. The company is committed to sustainability, infrastructure investments, and promoting water quality and conservation education programs. It also operates water systems for municipalities and private companies and offers water quality testing and emergency support.

Key Metrics

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Technology Stack

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Cloud & Infrastructure

Oracle Cloud

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