Current Status of Lake Elsinore 

Update as of December 1, 2021 - NOTE: Page only updated if the status changes. See below for any advisories currently related to Cyanobacteria, i.e. Harmful Algae Blooms. Please note, at this time, sampling is being conducted every two weeks by the State for a study. The City makes every effort ot update this information, however, you are encouraged to also check the state's website. The link is listed below. Signs are posted and updated around the lake whenever the status changes. 

Status of the Lake: Lake Elsinore is open for all recreational uses including boating, fishing, kayaking and more. The City and State regularly samples and monitors the Lake as needed to ensure the health and safety of Lake Elsinore. Updates are posted as they become available and are necessary should the condition of the lake change.  

Latest Cyanobacteria Information: The last Cyanobacteria sampling event for the Lake took place on November 18, 2021. Microcystins associated with cyanobacteria or harmful algae blooms was detected at low levels. Currently, a Warning advisory is in place for the lake due to these results. No other toxins were detected that are associated with cyanobacteria. 

See latest water monitoring results and advisories available on the State's Harmful Algae Bloom Portal.  Be sure to scroll to Lake Elsinore or Riverside County to view details. 

Lake Elsinore has historically been vulnerable to algae blooms, but only began sampling for or learning about Cyanobacteria concerns in 2016. Sampling is only conducted as needed based on the state of the lake. 

View Trigger Levels determined by the State 

View Caution (Espanol), Warning (Espanol) and Danger (Espanol) Signs 

State Website regarding Harmful Algae Blooms (HAB) - Zoomed in HAB Map of Lake Elsinore

Find out more about Cyanobacteria, i.e. Harmful Algae Blooms

Harmful Algae Bloom Fact Sheet and FAQs

Read an FAQ regarding Posted Signs Related to Harmful Algae Blooms 

Physician Fact Sheet

Dog Owners Fact Sheet 

Lake Elsinore is located at the bottom of the 720 square-mile San Jacinto Watershed. Rainfall throughout this area flows downstream through various tributaries into Canyon Lake before spilling into Lake Elsinore. This “run-off” brings critical water supply for the lakes, but is also susceptible to carrying with it nutrients and sediment that can be detrimental to the lakes’ water quality over time by encouraging algae growth. 

About Lake Elsinore's Health 

Lake Elsinore is Southern California’s Largest Natural, Freshwater Lake. Faced with a historic drought, extremely low water levels, higher temperatures, and an abundance of shad, the City has become increasingly concerned about the health of the lake and the vitality of the fishery.

In 2015, in an effort to be proactive and prepared, the City partnered with the Lake Elsinore & San Jacinto Watersheds Authority (LESJWA) launched Lake Watch 2015 to create awareness and engage the community, local and regional resource agencies and private businesses to take part in our efforts to prepare for and address the vulnerability of Lake Elsinore.

The City started its Lake Watch efforts to get prepared and regularly inform the community about the health and concerns of our most valuable asset - Lake Elsinore. While the City and the Elsinore Valley Municipal Water District each spend more than $750,000 per year to add 5 million gallons of recycled water to the lake each day, it is not enough to offset evaporation. In 2016, lake's water level declined to its lowest levels since early 1993 and was extremely vulnerable to algae blooms and subsequent fish kills. At this time, we suffered our first detected blue-green algae bloom.

In 2017, storms helped to replenish the lake and the water quality greatly improved. However, 2018 was amongst one of our driest years on record and the lake levels have once again declined well below the optimal level of 1240’. Ultimately, the lake needs more rain and the City remains diligent in monitoring the lake's health and working toward long-term options to improve the overall health of Lake Elsinore.

Find out more about the Lake Elsinore & San Jacinto Watersheds Authority (LESJWA)

Learn about the latest projects completed in Lake Elsinore

Algae & Algae Blooms 

Algae are large photosynthetic organisms and are normal habitats of large bodies of water like a lake. Algae are very important to both freshwater and marine environments and most species are harmless under normal circumstances. Cyanobacteria are known as “blue-green algae” are actually bacteria and not a form of Algae. Algae and Cyanobacteria have very similar characteristics with the difference that certain Cyanobacteria toxins can be harmful to the environment, animals and human health.

Algae blooms occur when the algae grow at rapid speeds than normal causing dense accumulations in the water. Algae blooms are normal occurrences in bodies of water. They can become harmful when there is excessive growth. As the cyanobacteria die off, harmful toxins can be produced known as cyanotoxins Concerns regarding blue-green algae have been on the rise throughout the Country and California including Pyramid Lake, Discovery Bay, Lake Elsinore, and Silverwood Lake. 

Find out more about Cyanobacteria, i.e. Harmful Algae Blooms

Read an FAQ regarding Posted Signs Related to Harmful Algae Blooms 

Fish Kills 

In 2015, a fish survey conducted on behalf of LESJWA found that Lake Elsinore’s fishery is imbalanced due to an overpopulation of Threadfin Shad. Shad are small, highly sensitive fish that hinder the water quality by eating microscopic zooplankton, which consume algae. With Shad feeding on the zooplankton in the lake, there will likely be an algae bloom thus reducing dissolved oxygen. Such conditions, ultimately lead to the demise of this delicate fish. It is nature’s way to rebalance the fish population and improve the overall health and quality of the lake.

Since 2000, the City and LEJSWA in coordination with its partner agencies have greatly improved water quality and wildlife habitats in Lake Elsinore, as well as in the surrounding watershed. Successful projects to date include the following:

  • Lake Elsinore Wetlands Enhancement Project
  • Lake Elsinore Carp Removal
  • Island Wells Pump Station Improvements
  • Striped Bass Stocking
  • Lake Elsinore Destratification & Mixing System
  • Recycled Water Nutrient Removal & Conveyance Pipeline
  • Lake Habitat Improvements
  • Lake Elsinore Fisheries Management Report 

Despite these efforts, Lake Elsinore is a natural lake. A fish kill is one of Nature’s ways of rebalancing the food chain. While there is no indication currently that an event is imminent, the probability is always high during the hot summer months. 

In 2015 and 2018, Lake Elsinore did suffer a moderate fish kill. The City remains prepared and regularly monitors the dissolved oxygen in the lake for signs of concern.

Read the latest Lake Elsinore Fisheries Management Report, published in September 2020

Read press release announcing completed Lake Elsinore Fisheries Management Report 

Lake Watch

Lake Elsinore is an extremely complex, unique water body. It is a show lake that struggles due to increasing temperatures, recent algae blooms, and declining dissolved oxygen levels during the hotter months. Unfortunately, there is little the City or LESJWA can do to improve its current condition without a stable and reliable water level of above 1240'. 

Lake Watch is focused on ensuring the City, regional partners and the community is ready and prepared for any potential concerns related to the vulnerability of Lake Elsinore including declining lake levels, algae blooms and the potential of a fish kill.  

As part of Lake Watch, the City of Lake Elsinore and LESJWA asks the community and visitors to monitor the lake and notify the City should you notice anything abnormal including algae blooms or dead fish floating in the lake or washed up on shore.

To report, please call 951-674-3124 ext. 204, email or message the City at