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Officials, water authorities call Canyon Lake fish kills an emergency; testing and permits underway
Summary
City officials, the Canyon Lake Property Owners Association and Elsinore Valley Municipal Water District said a golden algae bloom is the likely cause of recent fish kills and that agencies are conducting sampling, weekly testing and exploring treatment options while coordinating with state regulators.
City and regional water officials and the Canyon Lake Property Owners Association (POA) said this week they are treating recent fish deaths at Canyon Lake as an emergency and are collecting samples and exploring targeted responses — but that any treatment will require regulator approval.
The POA’s board treasurer, Jeff Bill, told the City Council that experts from the Lake Elsinore San Jacinto Watershed Authority (LESHWA) and GEI consultants presented data showing “the golden algae bloom was determined to be the main cause of the fish dying in the lake.”
That assessment matters because, officials said, golden algae releases toxins that damage fish gills even in oxygen-rich water and thrives in cooler, saltier conditions. “We’re considering it an emergency,” said Greg Thomas, general manager of the Elsinore Valley Municipal Water District, adding that consultants were taking multiple samples at different depths and that officials will “listen to the experts” on treatment options.
Why this matters: Canyon Lake is a drinking-water reservoir with recreational use; the water district said it must balance ecological and public-safety risks when choosing a response. Officials said options under consideration include targeted algaecides, oxygenation systems and shoreline vegetation changes, but they stressed there is “no quick fix” and warned against broad treatments that could damage the lake ecosystem.
Supporting details: The POA and water district are increasing testing cadence (weekly tracking and fish-tissue analysis), and GEI consultants were on the lake taking depth samples the day of the council meeting. Thomas said regulators — the State Water Resources Control Board and the Regional Water Quality Control Board — have been contacted to determine whether existing permits can be used for a lake-wide treatment or whether a new permit would be required. He said using an existing permit could “streamline the whole process,” but that applying for a new permit could take months.
Council members and water officials described frequent interagency meetings and a plan to coordinate short-term and long-term actions. “We actually had a really good meeting…with all the 4 entities to address what can we do short term,” Thomas said. He warned against relying on nonexpert sources: “I’m not gonna AI this stuff — we’re gonna listen to the folks that have PhDs in algal linologies,” he said.
Limitations and next steps: No agency announced a final course of treatment at the meeting. Officials said they will return with results of the recent sampling and with permit guidance from state regulators. The city and POA have also scheduled community cleanup and outreach events and said they will continue public updates as testing results and regulatory approvals are available.
Ending: Residents with observations of fish kills or other lake conditions were told to report them to the POA and the water district so scientists have more field information to guide sampling and any future treatments.
