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 Drought Rationing Plan, and the Annual Water Use Report.

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. The UWMP provides water supply planning projections for a 25-year period and identifies water supplies needed to meet existing and future demands.

2020 Urban Water Management Plan

Following a public hearing and meeting, the West Basin Board of Directors adopted the 2020 UWMP, effective July 1, 2021. The Board also adopted a 2021 Water Shortage Contingency Plan.

View West Basin’s 2020 Urban Water Management Plan
View 2020 UWMP Fact Sheet
View 2020 UWMP Executive Summary

Archived UWMP

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. 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.

West Basin Drought Rationing Plan

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

Water Use Report 2020-2021

Archived Water Use Reports

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