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El Segundo reports 64 Hyperion odor complaints; SCAQMD issued notice of violation after hydrogen sulfide spikes
Summary
City staff reported approximately 64 odor complaints to the South Coast Air Quality Management District; a notice of violation for public nuisance was issued Dec. 19, 2024, and AQMD staff are investigating fence‑line hydrogen sulfide spikes that occurred during a facility power outage on Jan. 8, 2025
City Manager Darryl George updated the El Segundo City Council on odor complaints tied to the Hyperion wastewater treatment plant and related regulatory review. City staff and a Dr. Senstrom met with a company that developed a technology to remove odor at wastewater treatment facilities, George said.
George reported that over the past month the South Coast Air Quality Management District received approximately 64 odor complaints. AQMD issued a notice of violation for public nuisance on Dec. 19, 2024, and AQMD staff are investigating fence‑line hydrogen sulfide spikes recorded during a facility‑wide power outage on Jan. 8, 2025, the city said.
The update was informational; council did not adopt new regulations during the Jan. 21 meeting. City materials referenced the city website for more information on the administrative actions taken and to view meeting recordings.
Why this matters: Hydrogen sulfide is a common odorous gas from wastewater treatment and can cause community nuisance; the notice of violation and AQMD investigation indicate ongoing regulatory oversight and potential requirements for the Hyperion facility.
What's next: City staff will continue to coordinate with AQMD and report back to council as investigations or remedial actions develop.
