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Arroyo Grande relies on Lopez Lake for roughly 60–65% of its water supply, presentation says
Summary
A city presentation said Arroyo Grande gets about 60–65% of its water from Lopez Lake, with the remainder supplied by nine groundwater wells; treated surface water is processed at the Lopez Water Treatment Plant and fed into tanks and 87 miles of pipeline for delivery.
An agency official told a meeting that Arroyo Grande relies on a mix of treated surface water and groundwater to supply customers, with Lopez Lake providing approximately 60 to 65 percent of the city’s current water, and the remainder coming from groundwater pumped from nine wells.
The official said the surface water from Lopez Lake is processed at the Lopez Water Treatment Plant before distribution. "You get both a mix of treated surface water from Lopez Water Treatment Plant and groundwater," the agency official said.
The presenter identified the Santa Maria groundwater basin as the primary source of the groundwater and said a smaller amount comes from the Pismo Formation. The official added that once sourced and treated, water is stored in the city’s distribution tanks, which hold about 6.7 million gallons, and flows through about 87 miles of pipeline to reach homes in Arroyo Grande.
The presentation focused on describing the composition and routing of the city’s water supply rather than proposing policy changes or actions. No formal votes or motions were recorded in the transcript.
