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2019 Santa Clarita Valley Water Report Santa Clarita Valley Water Agency Los Angeles County Waterworks District 36

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2019 Santa Clarita Valley Water Report Santa Clarita Valley Water Agency Los Angeles County Waterworks District 36 2019 Santa Clarita Valley Water Report Santa Clarita Valley Water Agency Los Angeles County Waterworks District 36 July 2020 2019 Santa Clarita Valley Water Report prepared for: Santa Clarita Valley Water Agency Los Angeles County Waterworks District 36 July 2020 prepared by: William L. Halligan, PG Lisa Lavagnino, GIT Senior Principal Hydrogeologist Project Geologist Table of Contents Executive Summary ............................................................................... ES-1 ES.1 2019 Water Requirements & Supplies .................................................................... ES-1 ES.2 Groundwater........................................................................................................... ES-1 ES.3 I mported Water Supplies ........................................................................................ ES-3 ES.4 2020 Watter Supply Outlook .................................................................................. ES-4 ES.5 Water Supply Conservation .................................................................................... ES-5 1 - Introduction.......................................................................................... 1 1.1 Background ....................................................................................................................1 1.2 Purpose and Scope of the Report ..................................................................................3 1.3 Santa Clarita Valley Water Divisions and LACWD 36 .....................................................3 1.4 The Upper Santa Clara River Hydrologic Area and East Groundwater Subbasin ........................................................................................................................4 2 - 2019 Water Supplies and Use ............................................................ 10 2.1 2019 Water Supplies ....................................................................................................10 2.2 Historical Water Use Trends ........................................................................................11 2.3 Municipal Water Use ...................................................................................................13 2.4 Agricultural and Other Water Uses..............................................................................14 3 - Water Supplies ................................................................................... 15 3.1 Groundwater Basin Yield ............................................................................................15 3.2 Alluvium – General ......................................................................................................18 3.3 Saugus Formation – General .......................................................................................28 3.4 Imported Water Supplies.............................................................................................32 3.5 Other Water Sources ..................................................................................................37 3.6 Water Quality ..............................................................................................................38 3.7 Santa Clara River ..........................................................................................................45 4 - Summary 0f 2019 Water Supply and 2020 Outlook ........................... 50 4.1 2019 Water Demand ...................................................................................................50 4.2 Projected 2020 Water Demand and Supplies ..............................................................50 4.3 Supplemental Water Supply Sources ...........................................................................53 4.4 Water Supply Reliability...............................................................................................53 4.5 Water Supply Strategy .................................................................................................54 5 - Water Conservation ............................................................................ 56 5.1 Recent Conservation Efforts ........................................................................................56 5.2 2019 Water Use ...........................................................................................................57 6 - References .......................................................................................... 61 Appendix A: Historical Water Supply and Utilization Tables for Municipal and Agricultural/Other Users List of Tables Table ES-1: Santa Clarita Valley Summary of 2019 Water Supplies and Uses (af).......................................ES-1 Table 2-1: Summary of 2019 Water Supplies and Uses (af) ...........................................................................10 Table 2-2: Total Water Supply Utilization (af) .................................................................................................12 Table 2-3: Municipal Water Supply Utilization and Service Connections .......................................................13 Table 2-4: Water Supply Utilization by Agricultural and Other Users ............................................................14 Table 3-1: Groundwater Operating Plan for the Santa Clarita Valley .............................................................17 Table 3-2 2019 SCVWA Imported Water Supply and Disposition (af) ...........................................................35 Table 4-1 2020 Water Demand and Water Resources (acre-feet) ..................................................................52 Table 5-1: 20x2020 Compliance GPCD Targets and current levels .................................................................57 List of Figures Figure 1-1: SCV Water and LACWD 36 Service Areas .......................................................................................2 Figure 1-2: Upper Santa Clara River Hydrologic Area .......................................................................................5 Figure 1-3: Santa Clara River Valley Groundwater Basin and Subbasins ..........................................................6 Figure 1-4: Precipitation Gage Locations .........................................................................................................7 Figure 1-5: Annual Precipitation and Cumulative Departure from Mean Annual Precipitation at Newhall Fire Station #73 Gage ...................................................................................................9 Figure 2-1: Total Water Use by Sector ............................................................................................................10 Figure 2-2: Water Use by Source ....................................................................................................................10 Figure 2-3: Total Water Supply Utilization ......................................................................................................12 Figure 2-4: Service Connections and Municipal Water Use ...........................................................................13 Figure 3-1: Alluvium and Saugus Formation ..................................................................................................16 Figure 3-2: Groundwater Production – Alluvium ...........................................................................................21 Figure 3-3: Alluvial Well Locations by Area ....................................................................................................23 Figure 3-4: Groundwater Elevations in Eastern Santa Clarita Valley Alluvial Wells ........................................24 Figure 3-5: Groundwater Elevations in Western Santa Clarita Valley Alluvial Wells ......................................25 Figure 3-6: Annual Groundwater Production from Alluvium by Area (Acre-feet) ..........................................29 Figure 3-7: Saugus Formation Well Locations ................................................................................................30 Figure 3-8: Groundwater Production – Saugus Formation ............................................................................32 Figure 3-9: Groundwater Elevations in Saugus Wells .....................................................................................31 Figure 3-10: Treated Water Distribution System Santa Clarita Valley Water Agency .....................................33 Figure 3-11: Saugus Formation Monitoring Well Locations ...........................................................................40 Figure 3-12: Groundwater Quality in Eastern Santa Clarita Valley Alluvial Wells ...........................................42 Figure 3-13: Groundwater Quality in Western Santa Clarita Valley Alluvial Wells .........................................44 Figure 3-14: Groundwater Quality in Saugus Wells .......................................................................................46 Figure 3-15: Streamflow Discharge Gage Locations .......................................................................................48 Figure 3-16: Annual Stream Discharge............................................................................................................49 Figure 4-1: Historical and Projected Water Use .............................................................................................51 List of Abbreviations and Acronyms af acre-feet afy acre-feet per year Basin Santa Clara River Valley Groundwater Basin BMPs Best Management Practices
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