Scope of Work

Caliagua will perform key upgrades and expansions at WRP 10 (Wastewater Reclamation Plant No. 10), serving the Coachella Valley region. The work involves enhancing tertiary treatment capacity, upgrading process systems, and expanding reuse infrastructure. Specifically, the facility will process tertiary treated effluent through coagulation, flocculation, dual media filtration, disinfection (chlorine contact), and blending with canal water via a high/low pressure pumping station.  

In addition to treatment improvements, the project includes installation or rehabilitation of lined storage basins, evaporation/percolation ponds, and associated hydraulic conveyance systems to manage both recycled and residual flows. The scope also covers solid handling improvements (thickening, dewatering), yard piping, utility upgrades, electrical and control systems, instrumentation, and site restoration.  

Functional testing, commissioning, disinfection verification, operator training, and integration with existing plant operations are included to ensure that upgraded systems perform as intended. Temporary bypasses or storage strategies may be deployed to maintain service during construction.

Community Benefit

The WRP 10 improvements deliver meaningful benefits to the Coachella Valley community:

• Expanded Reuse for Irrigation & Landscaping — The project supports delivery of tertiary treated water for golf courses, landscape irrigation and other nonpotable uses (currently ~6 MGD reused)  
• Reduced Discharge & Lower Impacts — Excess treated effluent that can’t be reused is diverted to evaporation/percolation ponds, reducing uncontrolled discharge and managing water quality impacts.  
• Water Supply Reliability — By maximizing use of treated wastewater locally, the project helps ease dependence on scarce imported water resources, especially under drought stress.
• Groundwater and Basin Protection — The controlled disposal of excess flows and reuse of treated water prevent excessive nutrient loading of groundwater and help protect aquifer health. Calif. Water Resources Board
• Environmental Sustainability & Ecosystem Health — Better treatment and reuse reduce stress on downstream surface waters and ecosystems (e.g. rivers, canals) by lessening pollutant loads.
• Operational Resilience & Quality Assurance — The modernization of treatment, storage, and control systems strengthens system reliability, reduces risk of downtime, and enhances service to communities.