200 Portofino Way
Redondo Beach, CA 90277
Questions? Contact Seaside Lagoon via email.
Seaside Lagoon is currently closed. We open for our regular season from Memorial Day weekend through Labor Day weekend.
The large saltwater lagoon offers trained lifeguard supervision. Besides swimming, the Lagoon offers a large sand area for sunbathing.
The Seaside Lagoon is a saltwater facility. Water for seaside lagoon comes from the other side of the breakwater, at about 50 feet deep, travels to the nearby steam generating plant where they use it to cool the turbines. The water then travels under the street in large pipes to the Seaside Lagoon where it is chlorinated when entering the lagoon and de-chlorinated when leaving the lagoon back into the harbor. The Seaside Lagoon has approximately 1.5 million gallons of water and has a flow through rate of approximately 200,000 gallons per hour.