Casitas Municipal Water District's water supply is comprised of water stored in Lake Casitas and groundwater in the Ojai Valley. 

Historical water by use is shown in the chart below. While water use fluctuates from year to year based on weather and outdoor water demands, there has been a clear reduction in customer water use in response to the current drought (post-2013) and previous drought (post-1989).

Casitas manages water supply primarily through the Water Efficiency and Allocation Program, or WEAP. The WEAP ensures allocations of water and conservation targets are in line with drought conditions. 

In accordance with the WEAP, the District updates its supply projections and drought stages at the end of the rainy season, which is typically in April each year. 

The figure below presents the annual high-low water storage fluctuations that Lake Casitas has experienced since 1970.  Lake Casitas storage was last at full storage capacity in May 2006 and saw a declining storage trend due to drought conditions, evaporation, environmental conditions, and water use. The last two years has shown a sharp reversal of that trend. Lake Casitas reached full storage capacity in April 2024.

CMWD customers overall are doing an excellent job conserving at 62%.

In April 2021, the Casitas Board of Directors adopted updated long-term planned demands and operational yield for existing supplies, which are reflected in the 2020 Urban Water Management Plan. This study provides a summary of the future long-term demand analysis, future long-term supply analysis, and long-term supply and demand scenarios that were evaluated and adopted. 

As our community's water experts and responsible stewards of our water resources, Casitas is constantly working to plan for a more sustainable and reliable water future. This process involves taking a comprehensive look at our available water supplies and the water needs of our customers, and how we can ensure there will be enough water to go around, both now and into the future.

Every five years, the District prepares an Urban Water Management Plan - a state-mandated planning document to assess long-term water supplies and demands. The plan outlines:

• The reliability of water sources over a 20-year timeframe
• Demand management measures and water shortage contingency plans
• Progress toward meeting targeted reduction goals for per-person water consumption

Casitas' adopted Final UWMP is available here:

The Ventura River Watershed has been experiencing extreme dry conditions that have persisted since 2012. While Lake Casitas is designed to supply water during multi-year drought conditions, lake levels as of September 2022 are approximately 31 percent of capacity (73,600 Acre-feet remaining). Should dry conditions persist, the Casitas Board of Directors will face major decisions in the near term related to drought response and planning. The purpose of this white paper is to summarize information currently available on management options.