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District monitors Golden mussel risk and fine‑tunes wastewater battery bank project
Summary
General Manager Catherine Cerri told the Board the Golden mussel has been detected in the California Aqueduct and staff will monitor its potential to reach Silverwood and Lake Arrowhead; she also said the District is refining a battery bank electrical upgrade at the Grass Valley Wastewater Treatment Plant.
General Manager Catherine Cerri informed the Board on April 22, 2025, that the Golden mussel (an invasive species) has been detected in the California Aqueduct, which feeds Silverwood Lake, and that the District is monitoring the situation and coordinating with regional partners. Cerri said Lake Arrowhead’s historically low calcium content may have reduced the Lake’s vulnerability, but the newer Golden mussel tolerates lower calcium concentrations and therefore presents a new risk vector for regional reservoirs.
Cerri recommended vigilance around recreational boat inspections and noted the Arrowhead Lake Association operates a boat‑cleaning/monitoring program. She also told the Board staff are still fine‑tuning the battery bank project at the Grass Valley Wastewater Treatment Plant, including updates to electrical equipment, and that further updates will be provided as the project advances.
The Board asked questions and staff said they would continue to monitor the aquatic invasive species situation and report back as events warrant.
