Our Project

The Regional Groundwater Sustainability Project (RGSP) is a regional recycled water project that will develop a sustainable water supply and protect the Santa Maria Groundwater Basin (SMGB). The recent drought drastically impacted water resources for the Five Cities communities and highlighted the need for a sustainable, drought-proof source of supply to ensure that reliable water supplies will be available for future extended droughts. Currently the water from the Pismo Beach Wastewater Treatment Plant (WWTP) and the South San Luis Obispo County Sanitation District (SSLOCSD) WWTPs is being treated and discharged to the ocean. The RGSP will provide an opportunity to capture this lost water and use it to recharge the SMGB to create a drought proof, sustainable water supply for the community.

Current Water Supply

The Five Cities communities currently get their water from a combination of surface water (water that collects surface streams, lakes, and reservoirs) and groundwater (water found in underground aquifers). The surface water sources are the State Water Project and the Lopez Lake Reservoir and the groundwater source is the Santa Maria Groundwater Basin (SMGB). During times of drought, less water is available from both surface water and groundwater sources.

Project Overview

The Regional Groundwater Sustainability Project (RGSP) is a regional recycled water project that will develop a sustainable water supply and protect the Santa Maria Groundwater Basin (SMGB). The recent drought drastically impacted water resources for the Five Cities communities and highlighted the need for a sustainable, drought-proof source of supply to ensure that reliable water supplies will be available for future extended droughts.

Proposed Facilities

The RGSP will include upgrades to the existing wastewater treatment plant processes. These upgrades include Microfiltration/Ultrafiltration, Reverse Osmosis, and Ultraviolet disinfection with Advanced Oxidation. These process upgrades are referred to as Advanced Treatment and they are discussed in depth here. In addition to the process upgrades, the RGSP will also require injection wells to recharge the groundwater basin…