New Diablo Water District Customer Portal now available: online payment options, historical consumption and new features that will be launched soon to help customers manage their water use and bills.  

To pay via phone call: 866-279-7518

Due to the COVID-19 pandemic, our office is closed to the public.  Please use one of our online bill payment solutions or call the office 925-625-3798 to make payment arrangements.

Blending Facility

The District built a blending facility near the Randall-Bold Water Treatment Plant to blend District owned well water with treated water from the Randall-Bold Water Treatment Plant. This creates a cost-effective, high quality water supply for delivery to our customers. The well, the first practical source of local groundwater, is connected to the blending facility by a 3.5-mile-long pipeline.