Drinking Water Plants & Treatment

CCWD currently operates 2 water treatment plants: the Bollman Water Treatment Plant (PDF) and the Randall-Bold Water Treatment Plant (PDF).

The Bollman facility has a 75 million gallon per day (mgd) capacity and utilizes enhanced coagulation/sedimentation; intermediate ozonation; dual-media (sand and granular activated carbon); and finally chloramination for distribution system disinfectant residual. Water treated by the Bollman facility is purveyed directly to approximately 201,000 retail customers in the cities of:
  • Clayton
  • Concord
  • Martinez
  • Pleasant Hill
  • Walnut Creek
The Randall-Bold facility has a 50 mgd capacity and utilizes enhanced coagulation/sedimentation; intermediate ozonation; dual-media (sand and granular activated carbon); post-ozonation; and finally chloramination for distribution system disinfectant residual. Wholesale water treated by the Randall-Bold facility is delivered to CCWD retail customers and sold directly to the City of Brentwood, the City of Antioch, and the Diablo Water District (Oakley).

The ozonation process and granular activated/biologically active filtration are designed to effectively remove organic materials such as pharmaceuticals.