availability. For example, the Colorado River is expected to experience long-term climate change impacts in the form of more severe drought conditions (e.g., more frequent, more intense, and possibly longer lasting) as well as supply impacts from changes to precipitation and snowpack conditions (e.g., the volume and seasonal timing of available supplies). Similarly, imported SWP water supplies from the Bay-Delta may be impacted by climate change in the form of fluctuating flood and drought frequencies. Areas of increased concern for climate change in California include a reduction of the Sierra Nevada Mountain snowpack, increased frequency and intensity of extreme weather events, prolonged periods of drought, as well as impacts to coastal groundwater basins from sea level rise and potential impacts to pumping along the SWP and CVP related to intense storm events. As an innovator in tracking greenhouse gas emissions in water agencies, climate change impacts from both a distribution and general water supply perspective are important to IRWD. IRWD continues to reference and utilize new reports and regional projections pertaining to climate change conditions and expected shortages. As previously stated, Metropolitan and MWDOC both state in their respective 2025 UWMP’s that projected imported supplies are reliable, even with respect to climate change impacts, through 2050. E. Reduced Reliance on the Delta IRWD has prepared an analysis to demonstrate consistency with the Delta Plan Policy WR 1. Appendix B – IRWD’s Reduced Delta Reliance provides the analysis and documentation to demonstrate Irvine Ranch Water District’s (IRWD) improved regional self-reliance and measurable reduction in reliance on Delta water supplies. In the near term (2030) regional self- reliance is expected to increase approximately 44 percent from the 2010 baseline normal year retail demands. Long-term (2045) regional self-reliance is expected to increase by 43 percent from the 2010 baseline normal year retail demands. 7.3 Water Quality
Law
10634 The plan shall include information, to the extent practicable, relating to the quality of existing sources of water available to the suppler over the same five-year increments, as described in subdivision (a) of Section 10631, and the manner in which water quality affects water management strategies and supply reliability.
It is IRWD’s top priority to provide customers with safe, high quality drinking water. IRWD’s drinking water is safe and meets or exceeds all quality standards set by both the state and federal government. IRWD’s water quality staff continuously monitors the water supply, conducting over a quarter of a million laboratory tests each year from water taken from over 100 sample points throughout the IRWD service area. IRWD owns and operates a state-of-the-art Water Quality Laboratory that is state certified and one of the best equipped water laboratories in southern California. IRWD produces an informative Annual Water Quality Report for its customers. The Water Quality Report provides information on the source of the water, water testing results and how water quality compares with regulatory standards. Additionally, the report answers commonly asked questions about water quality.
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IRWD – 2025 Urban Water Management Plan
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