Home    Contact Us  

Wastewater Treatment Plants

The Sanitation Districts’ eleven wastewater treatment plants stretch from the Antelope and Santa Clarita Valleys to the ocean. These plants produce approximately 400 million gallons of treated wastewater every day.

Joint Water Pollution Control Plant (JWPCP)
Whittier Narrows Water Reclamation Plant (near South El Monte)
Los Coyotes Water Reclamation Plant (Cerritos)
San Jose Creek Water Reclamation Plant (near the City of Whittier)
Long Beach Water Reclamation Plant
Pomona Water Reclamation Plant
La Cañada Water Reclamation Plant (La Cañada-Flintridge)
Valencia Water Reclamation Plant
Saugus Water Reclamation Plant (Santa Clarita)
Palmdale Water Reclamation Plant
Lancaster Water Reclamation Plant

Joint Water Pollution Control Plant (JWPCP)
The JWPCP, located in the City of Carson, is the Districts' first facility and began operations in 1928. Two tunnels constructed in 1937 and 1958 connect the plant to ocean outfalls. Through the 1950s, the JWPCP was the only facility serving the Joint Outfall System.

The JWPCP has a capacity of 400 million gallons per day (mgd). The incoming wastewater is processed to a secondary treatment level (similar to the biological treatment at the water reclamation plants). However, this water is not reusable without relatively costly advanced treatment due to the high salt content of the water.

After treatment, the water is discharged to the ocean through two 6-mile long tunnels that extend under the Palos Verdes Peninsula to Royal Palms Beach at White Point where the tunnels connect to ocean outfalls. Two outfalls extend 1-1/2 miles into the ocean at a depth of approximately 200 feet and are used to discharge treated wastewater. Two smaller outfalls are available for use during peak flow conditions.

The JWPCP has elaborate systems to treat and recycle the solid materials removed during treatment. These solids are stabilized through anaerobic digestion, and the biogas (mostly methane gas and carbon dioxide) generated during the digestion process fuels a power plant onsite that meets the plant's energy needs. The resulting biosolids are beneficially reused (e.g., as mostly as soil amendment).

The Sanitation Districts own buffer property around the JWPCP that is occupied by the Wilmington Jaycees Athletic Complex, the Wilmington Boys and Girls Club, the Carson Depot Commercial Center, and the 17-acre Bixby Marshland, which was recently restored and enhanced.

The remaining seven plants within the Joint Outfall System were built to produce recycled water for the local community.


Joint Water Pollution Control Plant (JWPCP)


White Point on the Palos Verdes Peninsula

Whittier Narrows Water Reclamation Plant
(near South El Monte)

Located in an unincorporated area near South El Monte and within the Whittier Narrows Flood Control Basin, the plant has a capacity of 15 mgd. More than 99 percent of the recycled water is beneficially reused, mostly for groundwater recharge.

Click to Enlarge

Los Coyotes Water Reclamation Plant (Cerritos)
A portion of the recycled water from the Los Coyotes plant (treatment capacity of 37.5 mgd) is used for landscape irrigation at Ironwood Nine Golf Course and several neighboring cities.

Click to Enlarge

San Jose Creek Water Reclamation Plant
(near the City of Whittier)
Located in an unincorporated area near the City of Whittier, this is the Sanitation Districts’ largest reclamation plant (100 mgd). Nearly all of the recycled water produced at this plant is reused, mostly for groundwater recharge. 

Click to Enlarge

Long Beach Water Reclamation Plant
The City of Long Beach reuses some of the recycled water produced at this facility (which has a capacity of 25 mgd) for irrigation of parks, schools, golf courses, cemeteries, greenbelts, and commercial nurseries. Some of the recycled water receives advanced treatment at a separate facility operated by the Water Replenishment District. The purified water from the advanced treatment facility is used as a barrier to protect drinkable groundwater from seawater intrusion. 

Click to Enlarge

Pomona Water Reclamation Plant
The Pomona plant has a capacity of 15 mgd. Approximately half of the water recycled at this facility is reused for landscape irrigation and industrial applications. The remainder is directed to groundwater recharge. 

Click to Enlarge

La Cañada Water Reclamation Plant (La Cañada-Flintridge)
Located on the grounds of the La Cañada-Flintridge Country Club, the plant provides extended aeration secondary treatment for up to 200,000 gallons of wastewater per day from homes surrounding the golf course. All of the recycled water is used for the golf course.  

Click to Enlarge

The following four WRPs operate independent of the Joint Outfall System and are, therefore, not part of the Clearwater Program.

 

Valencia Water Reclamation Plant
This plant is located west of Interstate 5 near Magic Mountain Parkway, just west of the City of Santa Clarita. The facility was constructed in 1967 and has a capacity of 21.6 mgd. Some of the recycled water from Valencia plant is used to irrigate the Tournament Players Club Golf Course and greenbelts at the Westridge development. Solids removed from the wastewater treatment process are digested and recycled into compost.

Click to Enlarge

Saugus Water Reclamation Plant 
This plant is located east of San Fernando Road in the City of Santa Clarita. The facility went into operation in 1962 and has a capacity of 6.5 mgd.

The Saugus and the Valencia WRPs provide wastewater treatment for the Santa Clarita Valley. These facilities are interconnected to form a regional treatment system. Solids removed at the Saugus plant are conveyed to the Valencia WRP for treatment.

Click to Enlarge

Palmdale Water Reclamation Plant
Placed in operation in 1953 and last upgraded in 2011, the Palmdale plant provides tertiary treatment (in aerated oxidation ponds) for up to 12 mgd. Recycled water is used for landscape irrigation, agricultural irrigation, and municipal uses. Nearly 900 million gallons of recycled water can be stored in reservoirs for use in the summer when demand is high.

Click to Enlarge

Lancaster Water Reclamation Plant
Placed in operation in 1959 and last upgraded in 2012, the Lancaster plant provides tertiary treatment for up to 18 mgd. Recycled water produced at the Lancaster plant is used for landscape irrigation, agricultural reuse, municipal reuse, and support of Piute Ponds, a 400-acre, man-made wetland habitat. Recycled water is also used to replenish lakes at Los Angeles County’s Apollo Community Regional Park. Approximately 1.3 billion gallons of recycled water can be stored in reservoirs for use in the summer when demand is high. Solids removed from the wastewater treatment process are digested and recycled into compost.

Back to top

Click to Enlarge