General Information About the District

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.

Residential Rates & Fees
Commercial Rates & Fees
NOP wastewater plant

Service Area

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.

Population Served: 140,546

Customer Base

Oro Loma serves approximately 47,392 customers within the District’s jurisdiction, comprised of: 46,251 residential (97.59%); 1,138 commercial and light industrial (2.40%), and 3 significant industrial users (0.01%). Treatment services are also provided to approximately 21,370 customers from Castro Valley Sanitary District and the Cities of San Leandro and Hayward.

Services Provided

Sewer Activities:

Sewage Collection: The District collects sewage from approximately 46,000 households and 1,000 businesses.

Miles of Sewer: There are approximately 273 miles of sewer lines located in the District and maintained by it.

Lift Stations: The District has 14 sewage lift stations, which help sewage fl ow through the lines to the treatment plant.

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.

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 fl ow of 11.8 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 landfi ll.

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:

The District 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.

Number of Employees: FY 2021-22: 46  |  FY 2022-23: 46