Water Resource Planning

Supply Reliability Supply Reliability
Western Municipal Water District regional projects will create cleaner, more reliable local water supplies while reducing dependence on imported water - Arlington Desalter biodenitrification expansion and biodenitrification upgrade, Western Water Recycling Facility expansion, the Riverside-Corona Feeder, the Santa Ana River Water Rights Application and the Chino Desalter II expansion.  

Supply Plans & Rights

Western has updated its 2008 Integrated Regional Water Management Plan (IRWMP). The objective of this update was to: 
  • Augment the IRWMP to be consistent with the latest version of the California Water Plan
  • Augment the IRWMP to address additional topics and issues to position Western and its customers to apply for future grant funding
  • Conduct enhanced public outreach to stakeholders and disadvantaged communities
  • Incorporate the outreach results into the IRWMP
Integrated Regional Water Management Plan 
Urban Water Management Plan 
Upper Santa Ana River Habitat Conservation Plan

Western is a partner in the Upper Santa Ana River Habitat Conservation Plan (Upper SAR HCP). The goal of the Upper SAR HCP is to enable water agency partners to continue to provide and maintain a secure source of water for customers and conserve and maintain the rivers and streams that provide wildlife habitat in the watershed. 

For more information on the Upper SAR HCP, please visit the plan website: SAR HCP website

Facility Master Planning

Western recently completed updates to its water and wastewater facility master plans for the Riverside and Murrieta service areas. The goals of these plans was to:

  • updates demands, facility information and development activity for the Riverside and Murrieta service areas
  • evaluate the performance and capacity of the potable water, wastewater, and recycled/non-potable water systems, and 
  • determine new capital facilities and upgrades to meet existing, near-term (2030) and buildout conditions
In accordance with the California Environmental Quality Act (CEQA), Western released a Notice of Preparation (NOP) of an Environmental Impact Report/Notice of Scoping meeting to notify agencies and interested parties that a Program Environmental Impact Report will be prepared for the 2020 Riverside Facility Master Plan. A copy of the NOP can be accessed here.

In accordance with the California Environmental Quality Act (CEQA), Western has prepared an Initial Study and Mitigated Negative Declaration (MND) for the 2020 Murrieta Facility Master Plans. A copy of the approved MND and Notice of Determination can be accessed here.