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Wastewater Treatment and Disposal

Wastewater Treatment Process Diagram (PDF)

With a capacity of 17 million gallons per day, the DSRSD Regional Wastewater Treatment Facility cleans wastewater from the DSRSD sanitary sewer system in Dublin and the southern part of San Ramon, as well as wastewater collected by the City of Pleasanton. Public tours of the wastewater treatment facility and adjacent water recycling plant are held quarterly.

LAVWMA System Map

The Livermore Amador Valley Water Management Agency (LAVWMA) disposes of cleaned wastewater ("effluent") for DSRSD and the cities of Pleasanton and Livermore. The LAVWMA pipeline transports effluent from the DSRSD and Livermore treatment plants 16 miles to San Lorenzo, where it is discharged into a dechlorination facility and then a deep water outfall in San Francisco Bay, both operated by East Bay Dischargers Authority (EBDA).

Water Recycling

Recycled Water Uses in 2016 Diagram

In 2016, recycled water accounted for 24 percent of all water used by DSRSD customers. Nearly all of the recycled water—96 percent—was delivered through dedicated purple pipes to irrigate parks, school grounds, golf courses, and other large landscapes. (Recycled water pipes, valves, and sprinkler heads are always purple to distinguish them from potable water systems.) Tanker trucks hauling water to construction sites, a residential pickup program, and industrial uses at the treatment plant accounted for the rest of the 1.13 billion gallons produced in 2016.

Recycled Water Treatment Process Diagram

To improve the reliability of the Tri-Valley’s water supply, particularly in dry years, DSRSD and East Bay Municipal Utility District (EBMUD) created the San Ramon Valley Recycled Water Program. The partnership built the Jeffrey G. Hansen Water Recycling Plant, which annually produces more than one billion gallons of clean, safe, high-quality recycled water from the clean effluent from the adjacent DSRSD wastewater treatment plant. The City of Pleasanton joined the partnership in 2014. Construction underway at the plant will expand production capacity by 70 percent to meet growing peak summertime demand for irrigation water.

Recycled Water Cycle Diagram

Drinking water supplies in California are under severe pressure from increasing population, recurring droughts, and environmental needs. Cleaning wastewater so it can be used again conserves our drinking water supply, keeps our communities green, even during droughts, and discharges less treated wastewater to natural waterways such as San Francisco Bay. In the Tri-Valley, recycled water is used primarily for irrigation at golf courses, parks, greenbelts, roadway medians, schools, office complexes, greenbelts, and common areas in homeowner associations.

 DSRSD Service Area

Service Area Map

DSRSD provides potable and recycled water service to Dublin and the Dougherty Valley area of San Ramon, wastewater collection and treatment to Dublin and south San Ramon, and wastewater treatment to Pleasanton (by contract). The map linked above (PDF) is suitable for printing and emailing. To pinpoint a specific address in our service area, use our interactive map.

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