Wastewater Collection

About Wastewater Collection 

Wastewater originating from homes and businesses in the District’s service area flows into a system of pipes that convey the water to the treatment plant. The system handles flows from the City of Temecula, the City of Wildomar, and the City of Murrieta. This system of pipes is referred to as the “collection system.” The collection system consists of 80 miles of pipes ranging from eight inches in diameter up to 24 inches in diameter. Most of the system flow by gravity to lift stations that raise the water to a higher level so that it can continue its journey to the reclamation facility. The system contains three lift stations.

Sewer Lateral Maintenance

Customers can protect their home from sewer system overflows; view the Residential Sewer Lateral Maintenance Pamphlet (PDF) for more information.

Fats, Oils & Grease

Customers can help keep the system flowing smoothly by not adding objects and substances that can block the drainage system. Fats, oils, and grease can solidify in the collections system and block pipes. For more information on fats, oils and grease, view our Fats, Oils and Grease Brochure (PDF).

Flushable Wipes

Many personal hygiene wipes and cleaning products are marketed as being "flushable." But despite the confusing and misleading labels, you should never flush "flushable" or "disposable" products. No matter what a label says, the only items you should flush are human waste and toilet paper. Just because something disappears down your toilet doesn’t mean it won’t cause a problem in your sewer pipe or further down the line at wastewater treatment facilities. Items labeled as "flushable," "disposable," or "biodegradable" can get caught on roots in sewer pipes and contribute to blockages, backups, and overflows. Dispose of them in the trash, not the toilet.


Mercury is a naturally occurring element, exposure to which can affect the human nervous system, harm the brain, heart, kidneys, and immune system. If rinsed down the drain, the liquid metal will make its way to a wastewater treatment plant, which is not designed to remove toxic metals. As a result, some of that mercury will remain in the cleaned and disinfected wastewater that is discharged into receiving waters. That tiny amount of mercury would sink into the sediment. Bacteria and other natural processes would transform the mercury into methylmercury, which is easily absorbed by tiny plants and aquatic organisms in the water. From there, mercury begins its ascent through the food chain.

Wastewater agencies throughout California are working to reduce the amount of mercury that enters the environment through a variety of programs: household hazardous waste collection facilities, installation of mercury amalgam separators in dental practices, and mercury thermometer exchanges in high school and college chemistry labs.