California-Great Basin

October

• The water year begins October 1 each year and ends September 30. California’s 2025 water year begins with relatively good conditions in major Central Valley Project reservoirs, with 7.43 million acre-feet of water in storage, about 120% of the 15-year average. Shasta, the anchor of the CVP and California’s largest reservoir, is at a robust 2.78 million acre-feet of water, 113% of the 15-year average.