2018 Santa Clarita Valley Water Report Santa Clarita Valley Water Agency Los Angeles County Waterworks District 36 May 2019 2018 Santa Clarita Valley Water Report prepared for: Santa Clarita Valley Water Agency Los Angeles County Waterworks District 36 May 2019 MAY 2019 2018 SANTA CLARITA VALLEY WATER REPORT Table of Contents EXECUTIVE SUMMARY ............................................................................................................................ 1 ES.1 2018 Water Requirements and Supplies .............................................................................. ES-1 ES.2 Alluvium.............................................................................................................................. ES-2 ES.3 Saugus Formation ............................................................................................................... ES-4 ES.4 Imported Water Supplies .................................................................................................... ES-5 ES.5 Recycled Water ................................................................................................................... ES-6 ES.6 2019 Water Supply Outlook ................................................................................................ ES-6 ES.7 Water Conservation ............................................................................................................ ES-7 1 INTRODUCTION .............................................................................................................................. 1 Background .............................................................................................................................. 1 Purpose and Scope of the Report ............................................................................................. 2 Santa Clarita Valley Water Divisions and LACWD 36 ................................................................. 3 Senate Bill No. 634 Santa Clarita Valley Water Agency.............................................................. 4 The Upper Santa Clara River Hydrologic Area and East Groundwater Subbasin ......................... 4 2 2018 WATER SUPPLIES AND USE .................................................................................................... 7 2018 Water Supplies ................................................................................................................ 7 Total Water Use Historical Trends ............................................................................................ 7 Municipal Water Use................................................................................................................ 8 Agricultural and Other Water Uses ........................................................................................... 9 3 WATER SUPPLIES .......................................................................................................................... 10 Groundwater Basin Yield ........................................................................................................ 10 3.1.1 Historical Investigations.................................................................................................. 10 3.1.2 Current Operating Plan ................................................................................................... 11 3.1.3 Sustainable Groundwater Management Act (SGMA)....................................................... 12 Alluvium – General ................................................................................................................. 13 3.2.1 Alluvium – 2018 Pumpage .............................................................................................. 14 3.2.2 Alluvium – Hydrogeologic Conditions.............................................................................. 14 Saugus Formation – General................................................................................................... 18 3.3.1 Saugus Formation – 2018 Pumpage ................................................................................ 18 3.3.2 Saugus Formation – Hydrogeologic Conditions ............................................................... 18 Imported Water Supplies ....................................................................................................... 20 3.4.1 State Water Project Table A and Other Imported Water Supplies ................................... 21 LUHDORFF AND SCALMANINI CONSULTING ENGINEERS i MAY 2019 2018 SANTA CLARITA VALLEY WATER REPORT 3.4.2 2018 Imported Water Supply and Disposition ................................................................. 22 3.4.3 Water Banking and Exchange Supplies ............................................................................ 22 Other Water Sources .............................................................................................................. 24 3.5.1 Recycled Water .............................................................................................................. 24 3.5.2 Treated Water ................................................................................................................ 25 Water Quality......................................................................................................................... 25 3.6.1 Water Quality – General ................................................................................................. 25 3.6.2 Groundwater Quality – Alluvium .................................................................................... 28 3.6.3 Groundwater Quality – Saugus Formation ...................................................................... 29 3.6.4 Imported Water Quality ................................................................................................. 30 Santa Clara River .................................................................................................................... 30 4 SUMMARY OF 2018 WATER SUPPLY AND 2019 OUTLOOK ........................................................... 33 2018 Water Demand .............................................................................................................. 33 Projected 2019 Water Demand and Supplies .......................................................................... 33 Supplemental Water Supply Sources ...................................................................................... 34 Water Supply Reliability ......................................................................................................... 34 4.4.1 SWP Delivery Capability .................................................................................................. 34 4.4.2 Water Supply Reliability Plan .......................................................................................... 35 Water Supply Strategy............................................................................................................ 36 5 WATER CONSERVATION ............................................................................................................... 37 Historical Conservation Efforts ............................................................................................... 37 Recent Conservation Efforts ................................................................................................... 37 2018 Water Use ..................................................................................................................... 39 6 REFERENCES ................................................................................................................................. 41 LUHDORFF AND SCALMANINI CONSULTING ENGINEERS ii MAY 2019 2018 SANTA CLARITA VALLEY WATER REPORT List of Tables Page Table ES-1 Santa Clarita Valley Summary of 2018 Water Supplies and Uses ................................ ES-2 Table 2-1 Water Supply Utilization by Santa Clarita Valley Water Agency and Los Angeles County Waterworks District 36 ........................................................................................ (after) 7 Table 2-2 Individual Water Supply Utilization by Agricultural and Other Users .................... (after) 7 Table 2-3 Total Water Supply Utilization for Municipal, Agricultural and Other Uses ................................................................................................... (after) 7 Table 2-4 Service Connections by Division and LACWD 36 .............................................................. 9 Table 3-1 Groundwater Operating Plan for the Santa Clarita Valley.............................................. 11 Table 3-2 2018 SCV Water Imported Water Supply and Disposition .................................. (after) 22 Table 4-1 2019 Water Demand and Water Resources ....................................................... (after) 34 Table 5-1 20x2020 Compliance GPCD Targets and Current Levels ................................................ 39 List of Figures (all figures follow their respective sections) Figure 1-1 SCV Water, Water Divisions and LACWD 36 Service Areas Figure 1-2 Upper Santa Clara River Hydrologic Area Figure 1-3 Santa Clara River Valley Groundwater Basin and Subbasins Figure 1-4 Precipitation Gage Locations Figure 1-5 Annual Precipitation and Cumulative Departure from Mean Annual Precipitation at Newhall Fire Station #73 Gage Figure 2-1 Total Water Supply Utilization Figure 2-2 Service Connections and Municipal Water Use Figure 3-1 Alluvium and Saugus Formation Figure 3-2 Groundwater Production – Alluvium