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Hyperion Treatment Plant

Hyperion Treatment Plant: The Largest Wastewater Treatment Facility in Los Angeles


The Hyperion Treatment Plant is one of the largest wastewater treatment facilities in the world, located in Los Angeles, California. Serving over four million residents in the greater Los Angeles area, Hyperion plays a crucial role in treating and recycling wastewater to protect public health and the environment. In this article, we will explore the history, design, operations, and future plans of the Hyperion Treatment Plant.


The Hyperion Treatment Plant was first established in 1894 as a small sewage disposal facility on the shores of Santa Monica Bay. Over the years, as the population of Los Angeles grew rapidly, the need for a larger and more efficient wastewater treatment plant became evident. In the 1950s, the Hyperion Treatment Plant was expanded to accommodate the increasing demand for wastewater treatment services.

In 1975, Hyperion underwent a major upgrade to meet stricter environmental regulations and improve treatment processes. The plant was equipped with advanced technology and equipment to remove pollutants and contaminants from wastewater more effectively. Today, Hyperion is one of the most advanced and sophisticated wastewater treatment facilities in the country.


The Hyperion Treatment Plant covers an area of 144 acres and consists of several key components, including primary treatment facilities, secondary treatment facilities, and advanced treatment facilities. The primary treatment process involves removing large solids and debris from wastewater through physical filtration and settling. This helps prevent clogging and damage to downstream treatment equipment.

The secondary treatment process at Hyperion utilizes biological processes to break down organic matter and remove dissolved pollutants from wastewater. Microorganisms are used to treat wastewater in large aeration tanks, where they consume pollutants and convert them into harmless byproducts. This process helps to further purify the water before it is discharged into the ocean.

The advanced treatment facilities at Hyperion include filtration, disinfection, and nutrient removal processes to ensure that the treated water meets strict regulatory standards. Filtration removes any remaining solids or impurities from the water, while disinfection kills harmful bacteria and pathogens. Nutrient removal helps to reduce the levels of nitrogen and phosphorus in the water, which can cause harmful algal blooms in marine ecosystems.


The Hyperion Treatment Plant operates 24 hours a day, seven days a week to treat an average of 350 million gallons of wastewater per day. The plant uses a combination of physical, biological, and chemical processes to remove contaminants and pollutants from the water before it is discharged into the ocean. The treated water is tested regularly to ensure that it meets all regulatory standards for water quality and public health.

In addition to treating wastewater, Hyperion also generates renewable energy from biogas produced during the treatment process. The plant has a state-of-the-art anaerobic digestion facility that converts organic waste into biogas, which is then used to generate electricity and heat for the plant. This helps to reduce the plant’s reliance on fossil fuels and lower its carbon footprint.

Future Plans

As Los Angeles continues to grow and expand, the demand for wastewater treatment services is expected to increase in the coming years. To meet this demand, the Hyperion Treatment Plant is undergoing a major expansion and upgrade project. The plant is investing in new technology and infrastructure to improve treatment processes, increase capacity, and enhance efficiency.

One of the key goals of the expansion project is to increase the plant’s resilience to climate change and sea-level rise. As sea levels continue to rise, the risk of flooding and storm surges at the plant’s location on the coast of Santa Monica Bay is increasing. By investing in flood protection measures and upgrading critical infrastructure, Hyperion aims to ensure that it can continue to provide essential wastewater treatment services to the residents of Los Angeles for decades to come.


The Hyperion Treatment Plant is a critical piece of infrastructure that plays a vital role in protecting public health and the environment in Los Angeles. By treating and recycling wastewater, Hyperion helps to prevent pollution of the ocean and protect marine ecosystems from harm. With ongoing upgrades and expansions, the plant is well-positioned to meet the growing demand for wastewater treatment services and continue to provide safe and reliable water resources for the residents of Los Angeles.