1,2,3 TCP Removal Treatment Plant

The City of Chino Hills has broken ground on the City’s new 1,2,3-Trichloropropane (TCP) water treatment facility, a project that will allow the City to reactivate six City-owned wells and reduce dependence on costly imported water. The new treatment facility will be located on Eucalyptus Avenue, adjacent to Boys Republic near the intersection of Eucalyptus Avenue and Pipeline Avenue. Once completed in late 2024, the water treatment facility will allow the City to provide an additional local source of high-quality drinking water that is clean, safe, drought-proof, and cost-effective.

In 2017, the California State Water Resources Control Board changed the acceptable levels of TCP allowed in drinking water. TCP is a contaminant substance found in pesticides, paint, varnish remover, and degreasing agents, and used as a cleaning and maintenance solvent. As a result, many cities across California, including Chino Hills, were required to inactivate City-owned wells until they could construct a new water treatment plant to remove TCP from the water and meet the new, more stringent State and Federal drinking water standards. This project includes the installation of Granular Active Carbon (GAC) treatment vessels in a tandem series train for the removal of 1,2,3-TCP from the City's groundwater supply before sending the domestic water to the distribution system.  

Project Description:

The work comprises the following: mobilization, demolition, trees removal, grading and earthwork, piping, instrumentation, Booster 9 improvements (such as replacing pumps and motors, upgrading electrical units and telemetry system), landscaping, block wall, installing GAC treatment vessels, surge tank, connections to existing utility mainlines, start-up and commissioning, and other appurtenances to complete the project.  


3982 Eucalyptus Avenue, Chino Hills

Site Plan

Current Construction Activities:

Below are the general construction key milestones/ schedule:

  • November 2022: Begin Demolition
  • November 2023: Delivery and Installation of GAC Vessels
  • Summer 2024: Complete Construction
  • Summer 2024: Testing, start up, and commissioning

Construction Update/ Notices:

On-Site Work (Ongoing)
Various on-site work continues such excavation/trenching, installation of pipes, stubouts, valves, electrical conduits, and appurtenances.  Prepping and fine grading base/foundation for GAC pad; forming concrete pad.

  • Delivery of GAC vessels on-site (November 2023)

Street Work (TBD - November/December 2023) 
(Adjacent to the site on Eucalyptus Avenue between Bluebell Drive and Pipeline Ave)

  • Traffic Control Device set up on public ROW (Message Boards, cones, signage, flaggers, etc.) to match the approved Traffic Control Plan within Eucalyptus Avenue.
  • Intermittent lane closures and shifting of traffic involving flag men as needed.
  • Excavate/expose water main line. 
  • Install recessed steel traffic plates.
  • Install/drop-in new water valves.

Construction Timeframe:
375 calendar days
(Working hours are from 7:00 am - 7:00 pm, M-F, except City holidays)

Point of Contact:

Fe Rama, P.E., Senior Engineer 
Phone: (909) 364-2776
Email: frama@chinohills.org