Reports & Plans

The Water Policy and Resources Development Department is responsible for developing viable plans and initiatives to ensure reliability of the region’s water supplies. It plays an important role in reducing the region’s dependence on imported water by expanding the local water supply portfolio in an economically feasible manner. Through effective partnerships and innovative planning, the staff continues to demonstrate a proactive approach to water resource management.

West Basin develops three planning documents: The Urban Water Management Plan, the Annual Water Use Report, and the Drought Rationing Plan.

Urban Water Management Plan

2015 Urban Water Management Plan (Current)

Urban Water Management Plan The State of California, through the California Water Management Planning Act of 1983, as amended, requires every urban water supplier to develop an Urban Water Management Plan (UWMP) every five years to demonstrate in detail how their agency manages their water supplies and demands under all hydrology conditions. Following the public hearing held on June 27, 2016, the West Basin Board of Directors adopted the UWMP.

This plan demonstrates not only how West Basin plans to meet its service area’s retail demands over the next 25 years, but also how they plan to provide long-term water reliability through supply diversification. Since West Basin’s formation in 1947, West Basin has strived to ensure water reliability. Through its efforts in recycled water, conservation, education, groundwater recovery and ocean water desalination research, West Basin continues to be a leader in water reliability by investing in a well-balanced water supply portfolio.

Download the 2015 Urban Water Management Plan

2020 Urban Water Management Plan (In Development)

West Basin is updating its Urban Water Management Plan.

Water Code section 10621(b) requires an urban water supplier that is updating its UWMP to notify cities and counties within its service area of the update at least sixty (60) days prior to holding a public hearing. A public notice (linked below) serves as West Basin’s official notice of preparation and intent to adopt the UWMP, Water Shortage Contingency Plan (WSCP), and Draft Appendix I to the 2015 UWMP before the July 1, 2021 deadline.

A copy of West Basin Municipal Water District’s draft 2020 UWMP, WSCP, and Draft Appendix I to the 2015 UWMP will be available for review on the District’s website in spring of 2021. West Basin will  hold a noticed public hearing on the 2020 UWMP, WSCP, and Draft Appendix I to the 2015 UWMP in advance of its proposed adoption. The public hearing is scheduled to be held during the West Basin Board meeting on June 10, 2021 at 10:00 a.m. West Basin invites public comment and consultation with the District regarding these plans.  Read the public notice.

Water Use Report

Water use Report

Every year West Basin develops the Water Use Report to inform its customer agencies, Board of Directors and key stakeholders of the service area’s annual water usage as well as its customer agency’s retail usage. It is designed to be a water resource reference tool summarizing the following information:

  • 10-year historical water use (imported, recycled, and groundwater)
  • Water use by month over the most recent fiscal year
  • Tier 1 and commitment amount
  • Potable meter connection data
  • Imported & recycled water rates & charges
  • Contact information
  • Recycled water connections

In addition, the report briefly highlights some of the recent activities West Basin is engaged in within the service area.

Download the Water Use Report 2018-2019

Archived Reports


Drought Rationing Plan

The West Basin Drought Rationing Plan (DRP) was in effect from 2009-2011 (under the name Water Shortage Allocation Plan) and 2014-2015.The information below describes the methodology used to implement the DRP.

Metropolitan Water District’s (MWD) Board of Directors approved the amended Water Supply Allocation Plan in March, 2015 under the new name Drought Rationing Plan. It is based on a guiding principle developed almost 15 years prior as part of their Water Surplus and Drought Management Plan.

“Metropolitan will encourage storage of water during periods of surplus and work jointly with its member agencies to minimize the impacts of water shortages on the region’s retail consumers and economy during periods of shortage.”

Fairness in allocation and minimizing regional hardship to retail water consumers remained central themes in the development of a specific formula for allocating shortages across Southern California. The formula uses different adjustments and credits to balance impacts of shortage at the retail level, where local supplies can vary dramatically, and provide equity on the wholesale level among member agencies. It also attempts to take into account; growth in demand, local investments, changes in local supply conditions, the reduction in potable water demand from recycled water, and the implementation of water conservation programs.

Based closely on MWD’s methodology, West Basin’s Drought Rationing Plan model, adopted by the Board of Directors in April 2009 and amended in March 2015, determines each customer agency’s share of West Basin’s allocation from Metropolitan.

Other Reports and Studies

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