Lake Update

June 16, 2026

Background

During April 2025, Canyon Lake experienced a major fish kill due to a Golden Algae Bloom. There are indications that this algae may have come downstream to our Lake from Menifee Lakes, which have had multiple blooms in recent years. Following consultation with water quality experts, scientists, regulatory agencies, and other stakeholders, an algaecide treatment was applied in an effort to mitigate the bloom and protect the lake's fishery as directed by experts in the field. In November 2025, reports began to emerge regarding corrosion on certain aluminum boats. Since that time, the Canyon Lake POA has worked with scientific consultants, water agencies, regulatory authorities, and other experts to investigate the matter.

Organizations Involved

Addressing this issue has been very complex with an investigation involving multiple government agencies and corporations. Because many questions have arisen regarding the various organizations involved in managing Canyon Lake and its water quality, we believe it is helpful to clarify their respective roles.

  • Canyon Lake Property Owners Association (Canyon Lake POA) - The Canyon Lake POA is a mutual-benefit, nonprofit corporation governed by and operated for the benefit of approximately 4,800 property owners. The Association leases recreational access rights from the Elsinore Valley Municipal Water District (EVMWD) and is responsible for operating the recreational amenities enjoyed by members.
  • Elsinore Valley Municipal Water District (EVMWD) - EVMWD owns Railroad Canyon Reservoir, commonly known as “Canyon Lake.” The reservoir serves as a drinking water resource and is regulated by state and federal agencies. EVMWD manages all drinking water-related operations and infrastructure associated with the reservoir. This reservoir is also governed by the State Water Resources Control Board (both Division of Drinking Water, and Division of Safety of Dams), LESJWA, Santa Ana Watersheds Authority, California EPA, and the Federal Environmental Protection Agency (EPA). EVMWD has treated the area in front of the dam and their water treatment plant with copper sulfate for many years, to keep the inlet pipes clear of algae. The treatment in 2025 was applied under EVMWD’s Aquatic Pesticide Application Plan/Permit and approved by the State Water Board. Chelated Copper is commonly used and approved in lakes throughout the country. EVMWD approved and partnered with the Canyon Lake POA in paying for this treatment under their permit. EVMWD’s focus is to provide affordable and healthy drinking water to its customers and graciously contributed to the costs to participate with the Canyon Lake POA to restore the aquatic life and overall health of the lake, as outlined within the regulatory permits.
  • Lake Elsinore and San Jacinto Watersheds Authority (LESJWA) - LESJWA is a public agency whose member organizations include the City of Canyon Lake, City of Lake Elsinore, Riverside County, SAWPA and EVMWD as its members. LESJWA oversees regional water-quality improvement programs, including the long-standing alum treatment program designed to reduce nutrients that contribute to algae growth. These treatments have helped to keep algae under control for many years. LESJWA’s mission is dedicated to improving water quality in Lake Elsinore, Canyon Lake and the rest of the San Jacinto River Watershed.
  • Aquatechnex - Aquatechnex is a licensed aquatic resource management company that performs lake treatment applications for numerous water bodies throughout the western United States.
  • SePRO Corporation - SePRO manufactures Cutrine® Plus, the algaecide used during the Golden Algae response effort of 2025.
  • GEI Consultants - GEI is an environmental and water-resources consulting firm retained to provide scientific expertise, water-quality analysis, and ongoing monitoring support.
  • State Water Resources Control Board and Regional Water Quality Control Board - These regulatory agencies oversee aquatic pesticide permitting and approved the applicable Aquatic Pesticide Application Plan under which the treatment was conducted.

Status of the Investigation

Since receiving reports of corrosion, the Canyon Lake POA and its consultants have undertaken extensive investigative efforts, including:

  • Ongoing water-quality monitoring and laboratory testing.
  • Review of treatment records and application data.
  • Consultation with scientists, engineers, water agencies, and regulatory authorities.
  • Evaluation of potential environmental and operational factors that may contribute to corrosion.
  • Collection and review of information provided by affected boat owners. To date, no single cause has been definitively identified.
  • Water samples have been collected regularly, and multiple laboratory analysis have been performed. Aluminum test plates representing various alloys were submerged in the lake for extended periods and did not exhibit corrosion. In addition, aluminum-hulled vessels that have operated extensively on the lake, including vessels involved in treatment activities, have not shown evidence of similar corrosion. These findings suggest the issue may involve multiple contributing factors, and the investigation remains ongoing.

Insurance and Claims

Members experiencing corrosion are encouraged to contact their own insurance providers to determine whether coverage may be available under their individual policies. The Canyon Lake POA has notified its general liability insurance company, Lexington, of the reports it has received. The claim is under investigation and administered by AIG. In addition, we have identified a local independent insurance broker to assist members who would like help understanding their policy and processing a claim, for more information, contact [email protected].

Current Lake Conditions

As we enter the summer boating season, current water-quality monitoring indicates that lake conditions are generally normal for conditions at this time of year. Golden Algae levels are now very low, routine testing continues, and results are posted on the Canyon Lake POA website. The Canyon Lake POA continues to conduct regular monitoring for water-quality conditions, including testing associated with both Golden Algae and cyanobacteria (blue-green algae). We are also working closely with our scientific consultants and regional partners to evaluate long-term strategies for maintaining water quality and protecting the health of the lake ecosystem.

Commitment to Transparency

We recognize that many members have questions regarding both the corrosion reports and future lake-management activities. The Canyon Lake POA remains committed to providing factual information as it becomes available and will continue to share updates as additional findings emerge. We appreciate the patience, cooperation, and feedback of our members as this complex investigation continues.