Case studies

City of Los Angeles Sanitation District

Los Angeles faces several overlapping water management challenges, including severe drought, concern over state-mandated water use restrictions, combined sewer overflows, flooding, declining water supply reliability, and climate change. To meet these challenges, Los Angeles has embraced the One Water concept of integrating all of its water resource management. The Los Angeles Department of Water and Power and Sanitation District LA’s One Water Program has grown into a full-fledged phenomenon and seeks to fully integrate the City’s wastewater, stormwater, watershed, and drinking water management by 2040. The Plan includes 445 Green Streets program opportunities and 176 additional distributed green infrastructure projects. The distributed green infrastructure projects represent 52% of all identified stormwater projects in the One Water Plan. Click the link below to download the full case study.

Project at a Glance

Utility Overview

  • Utilities: Los Angeles Sanitation & Environment and Los Angeles Department of Water & Power
  • Location: City of Los Angeles
  • Population served: 4 million
  • Service area: 500 square miles


  • Combined sewer overflows
  • Flooding
  • Declining water supply reliability
  • Climate change


  • One Water LA 2040 Plan, a roadmap coordinating effective and sustainable long-term water planning solutions, including a distributed green infrastructure element aimed at improving stormwater management by offering flood protection, water quality improvements, and local water supply.

Benefits of Los Angeles' One Water Plan

An integrated vision and implementation strategy
Reduced stormwater runoff
Expected to create nearly 7,000 new jobs
Habitat restoration
Greater local resilience and reduced reliance on imported water
Greater inter-agency cooperation and collaboration
Estimated to saving $1.97 for every $1 spent
Improved quality of life through new open space

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