How clean is the water at Echo Park Lake?

A monitoring device floats on Echo Park Lake to measure water quality


Echo Park – When Echo Park Lake was drained in 2011 as part of a 2-year rehabilitation project, the main reason was to clean the water itself. Now that the park has been reopened for five years, how clean is the water now, and will it stay that way?

According to Heather Johnson of Los Angeles Sanitation, water quality scientists routinely take a little boat out into the middle of the lake. The boats collect instrument readings and gather water samples – measuring things such as pH, temperature, conductivity, clarity, chlorophyll and solids. There’s also a real-time monitoring system that records measurements every fifteen minutes for a centralized database, where they can be viewed in real time.

And so far, the results are good, Johnson said.

“One of the main drivers for cleaning up Echo Park Lake was that the lake had excessive nutrient concentrations (nitrogen and phosphorus) which stimulated algae growth and resulted in impaired water quality,” Johnson said. “Currently the lake is meeting water quality targets for nutrient concentrations and algae growth is being kept in check.”

Plus, other measures, including the dissolved oxygen, show the lake can support a healthy aquatic ecosystem.

“As the wetland plants continue to mature and become established,” Johnson said, “it is anticipated that water quality will continue to improve.”

Monitoring devices measure water quality every 15 minutes

The one fly in the ointment is money. The clean-up project was paid for mostly with funds from Proposition O – about $45 million.  Now, it’s up to the city to continue to allocate enough money to pay for ongoing water-quality monitoring and maintenance to keep the water clean.

Councilman Mitch O’Farrell, who worked on the project as a council aide,  recently pledged to protect water-quality efforts when concern was raised about funds to maintain the lake’s wetlands.

The city’s sanitation department ” is working to ensure that Echo Park Lake is and will continue to be the jewel that it is,” said O’Farrell on Twitter. ” I worked too hard on the facility’s Prop O project to let the lake fall into disrepair.”



  1. Ever since the cleanup project, I have been very disappointed in the water in Echo Park Lake.

    No matter these readings, the water since that cleanup has been black, not clear water, it looks like the lake is filled with motor oil. Prior to the project, the lake was green, it looked like it was filled with antifreeze. Visually, the water looks no better as motor oil than it did as antifreeze.

    • You know naturally occurring lakes aren’t clear or blue, right? Have you been to a real lake before? That’s what real water looks like, brownish green. That’s natural. Lakes don’t look like chlorine filled pools, those are treated with special chemicals to look that way.

  2. Could you also obtain a third-party opinion regarding the cleanliness of the lake’s water? The Los Angeles Sanitation, although a different department that manages this lake, is still under the City of Los Angeles. The City of Los Angeles being the owner of this lake. Obtaining a third-party opinion will help ensure the veracity of the reported results.

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