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About Us


Diablo Water District is an independent, self-governing local public agency created on May 7, 1953, under the County Water District Law of California. The District is governed by an elected five-member Board of Directors. Learn more about California Special Districts.

Minutes of the First Meeting of the Board of Directors of Oakley County Water District (changed to Diablo Water District on May 1, 1993) outlining the formation of the District.

Who We Serve

The District, with a staff of 25 employees, obtains, treats, and supplies water for about 45,000 people and the parks, schools, and businesses throughout a 21-square-mile area consisting of Oakley, Cypress Corridor, and Hotchkiss Tract, as well as Summer Lakes, and portions of Bethel Island and Knightsen.


Our Mission

To be environmentally responsible stewards of the water resources in our care for the benefit of our community by continually striving to be leaders in: high-quality water, customer service, public engagement, technical innovation, and responsible fiscal management.

Our Vision

We are a valued community resource.

Our Guiding Principles

Public service is at the heart of everything we do.


We are focused on long-term water solutions.

Through advanced planning, construction of sustainable infrastructure, diversified water supply sources, and partnering with other local agencies for regional solutions.


We are driven by excellence.

By providing outstanding customer service, high-quality water, and industry best practices in safety.


We are leaders in environmental and sustainable projects.

Through focusing on carbon neutrality, groundwater sustainability, and a one water approach. 


We are transparent with financial and policy decisions.

Through treating rate payer’s funds as our own, best value-based purchasing, and providing customers with tools to reduce their individual water usage and bills.


We are committed to diversity, equity, and inclusion.

Through community engagement, taking initiative to assist our customers, and promoting employee development and wellness.