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      Department of Public Works Bureau of Sanitation
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The City’s wastewater system serves over four million people in Los Angeles and 27 cities that contract for this public works service. The system is comprised of more than 6,500 miles of sewer pipelines and four wastewater treatment and water reclamation plants that can process over 550 million gallons of flow each day citywide.

Los Angeles’ sewer system is completely separate from its storm drain system.

The following is a summary of the wastewater collection and treatment facilities currently operated by the Department of Public Works.

Wastewater Collection System; the Sewer System

  • Over 6,500 miles of sewers ranging from eight inches to 12 feet in diameter

  • 48 pumping plants lift wastewater from low-lying communities into larger sewers

Wastewater Treatment Plants

Hyperion Treatment Plant, the City’s largest facility, serves more than two-thirds of Los Angeles and has a capacity to process 450 million gallons per day (MGD); 100% secondary treatment.

Terminal Island Treatment Plant in San Pedro, serves Los Angeles Harbor area communities and has a capacity of 30 MGD; soon to be a water reclamation plant; 100% tertiary treatment with reverse osmosis treatment scheduled for late 2000.

Related Links

The Storm Drain System

How Sewers Can Impact the Storm Drain System

What Does "Full Secondary" Mean?

Water Reclamation Plants

Donald C. Tillman Water Reclamation Plant, serving San Fernando Valley communities, has the capacity to process 80 MGD, 100% tertiary treatment.

Los Angeles/Glendale Water Reclamation Plant serves eastern San Fernando Valley communities; it has the capacity to process 20 MGD, 100% tertiary treatment.

All wastewater treatment and water reclamation plants operate 24 hours a day, year-round.

Effluent Discharge and Water Reuse

Hyperion discharges most of its effluent into Santa Monica Bay through a five-mile ocean outfall; nearly 50 MGD of secondary effluent is recycled on-site or transported to nearby West Basin Municipal Water District Water Recycling Plant for use by local industries.

Terminal Island discharges effluent into the Los Angeles Harbor; new advanced treatment facilities will soon enable this water to be injected in the seawater intrusion barrier in the Dominguez Gap and/or used by nearby industries.

Nearly 30 MGD of TillmanÕs tertiary effluent is reused locally; the balance of the effluent flows into the Los Angeles River.

As much as 6 MGD of Los Angeles-GlendaleÕs effluent is reused locally —largely by the City of Glendale; the balance flows into the Los Angeles River.