Oro Loma Mission Statement

Provide the Highest Value in Wastewater, Solid Waste, and Recycling Services to Our Customers and Protect the San Francisco Bay and Our Communities.

General Information

Oro Loma Sanitary District was formed on August 7, 1911, and is one of the oldest sanitary agencies in Alameda County. It was subsequently reorganized under the Sanitary District Act of 1923 of the State Health & Safety Code, which empowers the District to provide sewer, solid waste, and recycling services as a special district of local government.  In Fiscal Year 2019-20, the District has a staff of 44 employees.

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Service Area and Population Served

The District encompasses 13 square miles, serving the communities of unincorporated Alameda County, including San Lorenzo, Ashland, Cherryland, Fairview, portions of Castro Valley, and designated areas of the Cities of Hayward and San Leandro. Oro Loma’s service area is located about 13 miles south of Oakland and 30 miles north of San Jose on the eastern shore of the San Francisco Bay.

Oro Loma serves approximately 47,103 customers within the District’s jurisdiction, comprised of: 45,910 residential (97.3%); 1,190 commercial and light industrial (2.69%), and 3 significant industrial users (0.01%). Treatment services are also provided to approximately 21,400 customers from Castro Valley and the Cities of San Leandro and Hayward. All together, the District services are provided to nearly 135,000 people.

Sewer Service Activities

Sewage Collection, Miles of Sewer Lines, and Lift Stations

  • The District collects sewage from approximately 46,000 households and 1,000 businesses.
  • There are approximately 273 miles of sewer lines located in the District and maintained by it.
  • The District has 13 sewage lift stations, which help sewage flow through the lines to the treatment plant.

Sewage Treatment and Disposal

The District’s treatment plant is jointly owned by Oro Loma Sanitary District (75%) and Castro Valley Sanitary District (25%). It has a permitted capacity of 20 million gallons per day, and treats an average dry weather flow of 12.4 million gallons per day. The District treats the wastewater to a secondary level through physical, biological, and chemical processes. The treated water, called effluent, is safely disposed of through a collectively-owned discharge pipe into the deep waters of San Francisco Bay. The plant produces approximately 11 dry tons of biosolids per day. These biosolids are disposed of annually and used as alternative daily cover at the Altamont landfill.

Reuse of Treated Wastewater

An annual total of 60 million gallons of treated effluent is re-used for irrigation at the Skywest Golf Course, saving freshwater supplies for residents and businesses while diverting effluent from the Bay.

Solid Waste Activities

The District oversees scheduled refuse collection services provided by a private collection company (Waste Management) for more than 47,000 residential and commercial customers.

Recycling Activities

Oro Loma provides residential recycling and green waste programs for the entire District, which includes the unincorporated areas of Alameda County and 40% of the City of San Leandro. These programs are intended to reduce solid waste in accordance with the California Integrated Waste Management Act of 1989 and Alameda County Measure D.

Important Numbers

(510) 276-4700 Oro Loma Sanitary District Office 24/7 Emergency Response

(510) 613-8710 Waste Management of Alameda County

(877) STOPWASTE Alameda County Recycling Hotline

(800) 606-6606 Alameda County Household Hazardous Waste

Our Facilities

Oro Loma Facility Tour Video

Watch Our Virtual Tour!

See what happens inside a Wastewater Treatment Plant and how we protect the San Francisco Bay.

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