$90-million Calif. water reuse project set for construction start in May

(UI) - Construction is set to begin in May 2026 on the $90 million Carpinteria Advanced Purification Project (CAPP), a water reuse initiative designed to expand local supply and reduce reliance on imported sources in Santa Barbara County. 

According to Smart Water Magazine, the project will capture treated effluent from the Carpinteria Sanitary District’s wastewater treatment plant—currently discharged to the Pacific Ocean—and further purify it through a multi-step process before injecting it into the local groundwater basin. Once operational, the system is expected to deliver approximately 1,000 acre-feet per year, meeting more than 25% of the community’s annual water demand.

CAPP is being developed to address long-standing supply challenges tied to dependence on the Cachuma Project and the State Water Project, which together account for the majority of the region’s water but have proven unreliable during drought conditions. Officials estimate the valley faces an annual supply shortfall of more than 1,100 acre-feet in dry years.

Project infrastructure includes an advanced water purification facility, a 10-inch pipeline, groundwater injection wells, and monitoring systems, Smart Water Magazine reported. Contractors have completed pre-construction activities, with Walsh overseeing treatment facility construction and Sam Hill & Sons responsible for pipeline installation.

The project is funded through a combination of state and federal grants covering nearly 40% of costs, along with low-interest financing and local rate revenue. CAPP is expected to be operational by the end of 2028.

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