Lathrop, California

The challenge

Veolia North America’s DBO project approach to municipal wastewater reclamation facilities serves needs of rapidly growing community.

The project challenges are:

  • Incorporated in 1991, Lathrop is a relatively new Northern California city that has experienced rapid growth.

  • In fact, the population is expected to quintuple by 2030.

  • To meet this projected growth, developers approached Veolia, which signed a 20-year agreement in 2003 to provide fast-track design and construction services for the city's 0.75-MGD tertiary treatment plant, which went online in 2006.

  • Today, Veolia also provides operate/maintain/manage (O&M) services to an upgraded 0.216-MGD secondary wastewater treatment plant. We also have responsibility for a Title 22 effluent reuse program and an industrial pretreatment program.

The solution

Innovative solutions:

  • Add redundant solids handling equipment to ensure efficiency in managing plant biosolids.

  • Provide state-of-the-art components, including an immersed membrane bioreactor, a grit collector system and a biological odor control system.

  • Complete upgrade of the aeration system for existing plant.

  • Assist city in development of a sludge land application program for the beneficial use of biosolids products.

  • Develop O&M manuals to meet state regulatory requirements.

  • Help city update its Industrial Pretreatment Ordnance and implement and administer industrial pretreatment program to protect effluent quality of both wastewater facilities.

  • Install a computerized equipment maintenance program that provides management and tracking for both wastewater plants.

  • Assume responsibility for all regulatory and compliance issues.

Benefits for our clients


  • Reduced number of necessary pumps and significant quantity of piping by relocating aerated digester.

  • Worked since project inception without a lost-time accident.

  • Completed design of next generation of the facility, which will double its capacity.

  • Worked to meet California's Title 22 requirements for effluent reuse.

  • ​Received 2004 Small-Plant-of-the-Year Award from the Northern San Joaquin Section of the California Water Environment Association.