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Hyperion 2021 Recovery

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BACKGROUND:

On the afternoon of Sunday July 11, 2021, the Hyperion Water Reclamation Plant became inundated with overwhelming quantities of debris, causing backup of the headworks facilities. The plant's relief system was triggered and wastewater overflows were controlled through use of the plant's one-mile outfall system at 7 pm which resulted in the discharge of untreated wastewater into Santa Monica Bay. Normally the discharge of secondary-treated effluent is through the five-mile outfall. During the over eight hours of discharge through the one-mile outfall, approximately 17 million gallons of wastewater (representing six percent of an average daily load) was discharged as a controlled emergency measure through its one-mile outfall relief system to prevent the plant from going completely offline and discharging much more untreated wastewater. The overflow of wastewater was through the one-mile outfall rather than the five-mile outfall because the plant's internal storm drains are connected to the one-mile outfall to ensure stormwater flows do not overwhelm wastewater treatment processes.

The nearly catastrophic flooding of the Hyperion Water Reclamation Plant resulted in significant areas of the plant being submerged under water and major damage to equipment and processes that treat and clean wastewater. Despite these impacts, Hyperion continues to treat wastewater through its secondary treatment process before discharge through its standard five-mile outfall.

City of Los Angeles forces and contractors are working around the clock to pump wastewater out of inundated facilities, sanitize facilities and equipment, and mitigate hazardous conditions inside the facilities caused by the flooding. It is expected to take a month or more to repair damaged facilities and equipment in order to restore full functionality to Hyperion. Our commitment is to complete the repairs as soon as possible.

If you missed our presentation on the morning of August 5, 2021 at Los Angeles City Council's ECCEJ&R Committee meeting regarding the incident at Hyperion Water Reclamation Plant, you can download a copy here.

If you missed our presentation on the morning of August 10, 2021 at the Los Angeles City Council meeting regarding the incident at Hyperion Water Reclamation Plant, you can download a copy here.

Please click here to read LASAN's 30-Day Report submitted to RWQCB and USEPA.

If you're interested in knowing how Hyperion's eight (8) bar screens work, please take a few minutes to watch this brief video.

If you missed the City of Los Angeles Board of Public Works Town Hall discussion on the evening of August 18, 2021 regarding the incident at Hyperion Water Reclamation Plant, you can download the presentation here and watch the Zoom recording here.

Please visit this page frequently to read updates about Hyperion's recovery process.

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RECOVERY UPDATES:
As part of our ongoing efforts to restore Hyperion Water Reclamation Plant operations to normal conditions, we are sharing Effluent Quality Data for the 5 Mile Outfall as well as a list of Critical Process Equipment in the spreadsheet below, in two tabs. Updates will be provided regularly.

For the latest information from AQMD about air quality, please visit their website.