Owned by the San Francisco Public Utilities Commission, the $114-million, 315-mgd Tesla Treatment Facility in Tracy, Calif., is the only design-build project (PCL Civil Constructors Inc. and Stantec Inc.) in the commission's list of 86 improvements to repair, replace and retrofit aging pipelines, tunnels, reservoirs and other facilities, an effort valued at $4.6 billion. The facility is being commissioned nine months before the U.S. EPA establishes a new requirement for a second disinfectant for unfiltered drinking water systems.