Clean Water

LA Sanitation & Environment (LASAN) is responsible for operating and maintaining one of the world’s largest wastewater collection and treatment systems. We proactively maintain over 6,700 miles of sewer lines and 49 pumping plants in addition to four water reclamation plants across the City, which have a combined capacity to treat 580 millions gallons per day (mgd) of wastewater.

Our Clean Water program consists of the Hyperion Service Area and the Terminal Island Service Area. The Hyperion system includes two upstream water reclamation plants: DC Tillman in the San Fernando Valley and Los Angeles Glendale near the intersection of the 5 and 2 freeways. Both of these plants produce recycled water used for landscape and industrial purposes as well as supplement the LA River to support the local habitat and other beneficial uses. Solids residuals from these plants are discharged back to the sewer for further treatment at the Hyperion Water Reclamation Plant (HWRP).

HWRP treats the vast majority of the City's flow, a portion of which is recycled with the remainder going to the Santa Monica Bay. Solids treatment occurs at HWRP, where Class A biosolids are produced for beneficial reuse.

Terminal Island consists of a separate collection system and treatment plant in the LA Harbor area, producing advanced treated water and biosolids for beneficial use.

If you have any questions about our services, please call our 24-hour Customer Care Center at 1-800-773-2489.

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LASAN operates four treatment and water reclamation plants.  The main purpose of these plants is to remove potential pollutants from LA's sewage in order to protect our river and marine environments and public health. 

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LASAN operates the largest wastewater collection system in the US, serving a population of four million within a 600 square mile service area. LA's more than 6,700 miles of public sewers convey 400 million gallons per day of flow from customers to LASAN's four plants.

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The wastewater treatment process produces nutrient rich byproducts that can have a beneficial reuse such as soil amendment, fertilizer, as an ingredient in compost, or as an energy source.More about BIOSOLIDS
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The City of LA is mandated to protect public health and safety while ensuring that wastewater collection systems and treatment plants are not unduly burdened by discharges from industrial users (discharger of water bearing waste other than domestic wastewater). 

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Property owners are responsible for private sewers (pipes connecting buildings to the public sewer system) and septic systems. LASAN manages several programs that can help customers avoid common problems with their private sewers and septic systems.  

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Flushing anything but human waste and toilet paper can cause blockages, back ups, and sewer line breaks. Unfortunately, when this happens, untreated sewage can enter the storm drain system and impact our beaches.More about CLEAN WATER EDUCATION