Brown and Caldwell, Carollo Engineers Joint Venture Selected for South County Ag Program

(UC) — A joint venture (JV) of Brown and Caldwell and Carollo Engineers has been selected by the Sacramento Regional County Sanitation District (Regional San) to provide capital program management services for the $375 million South Sacramento County Agriculture & Habitat Lands Recycled Water (South County Ag) Program. 

Rendering of the tertiary treatment facility currently under construction to produce Title 22 irrigation water

The Program represents one of the largest agricultural reuse projects in the United States, providing up to 50,000 acre-feet per year of Title 22 tertiary-treated recycled water to irrigate up to 16,000 acres of permanent agriculture and habitat conservation lands near the Cosumnes River and Stone Lakes Wildlife Refuge in Sacramento County.

Major upgrades at Regional San’s Sacramento Regional Wastewater Treatment Plant (SRWTP) are underway via the EchoWater Project which will increase the production capacity of tertiary treated wastewater at the SRWTP from 3 million gallons per day (mgd) to 217 mgd. Up to 114 mgd will be available for recycled water use.

The recycled water will be conveyed from the SRWTP to agricultural lands in southern Sacramento County via new transmission and delivery pipeline infrastructure.

The Program will reduce the need to pump groundwater for agricultural use in the area and result in the recovery of groundwater levels (in-lieu of recharge).

“In 2007, Regional San identified the South County Ag Program as an opportunity to significantly increase and expand the use of recycled water in the Sacramento region. We’ve cleared a number of significant hurdles to get to this point of actually being able to make it a reality,” said Regional San Program Manager Mike Crooks.

The Brown and Caldwell/Carollo JV will provide technical, financial, and project management oversight for the project. The team will schedule the design and construction of the new recycled water delivery system, consisting of a 95-mgd pump station and 65 miles of transmission and distribution pipelines.

The first phase of the recycled water delivery system is expected to be operational by late 2023.

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