About Water Pollution Control

The Water Pollution Control Division is responsible for the regulation, collection, treatment and disposal of wastewater from all residential and commercial sources within the City's sewer service area. It is our mission to responsibly, cost-effectively and professionally:

  • Collect and biologically treat wastewaters;
  • Recycle biosolids;
  • Protect San Francisco Bay water quality;
  • Supplement the limited water supply with recycled water;
  • Protect the ecosystem; and
  • Educate and create partnerships with the public.

 The Wastewater Treatment Division provides operation and maintenance of the Water Pollution Control Plant, 125 miles of sanitary sewer pipelines, 13 remote sewage pump stations and the inspection and maintenance of the City's storm water collection system.

The Division also provides contract operation, maintenance and laboratory services to the East Bay Dischargers Authority and environmental oversight of hazardous materials, wastewater pretreatment pollution prevention, storm water permitting and contaminated sites. The City serves 50,000 residents, as well as businesses, in the northern two-thirds of San Leandro.


Additional Facts:

Annual Operating Budget:

$13.4 million

Wastewater Treatment:

  • The facility cleans about 5 million gallons of wastewater a day, with spikes up to 14 million gallons per day.  The facility treats wastewater to a secondary level through physical, biological and chemical processes.
  • Treated effluent (water) is safely disposed of through a collectively owned discharge pipe into the deep waters of the San Francisco Bay.

Maximum Dry Weather Flow Capacity:

7.6 million gallons per day. Average dry weather flows are about 5 million gallons per day.

Plant Loading:

  • The facility has the highest BOD (biochemical oxygen demand) load and the third highest TSS (Total Suspended Solids) load of all 28 facilities operating in the Bay Area.

  • An influent load 70% higher than the average concentration of BOD and 33% higher than the average concentration of TSS.
  • Our effluent is one of the cleanest in the Bay Area for both BOD and TSS.  

Solids Collection:

  • The treatment facility removes approximately 6,000,000 lbs of solids from the wastewater each year.
  • The facility produces approximately 1000 tons of Class A Exceptional Quality biosolids each year.
  • These biosolids are taken to be used in beneficial land applications.

Recycled Water:

The Plant provides approximately 100 million gallons of treated water per year to Monarch Bay Golf Course.

In the summer of 2019, the Plant opened a Recycled Water Station to provide free recycled water to San Leandro residents.