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2016 SANTA CLARITA VALLEY WATER REPORT Castaic Lake

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2016 SANTA CLARITA VALLEY WATER REPORT Castaic Lake 2016 SANTA CLARITA VALLEY WATER REPORT June, 2017 Prepared by Castaic Lake Water Agency CLWA Santa Clarita Water Division Los Angeles County Waterworks District 36 Newhall County Water District Valencia Water Company 2016 Santa Clarita Valley Water Report prepared for: Castaic Lake Water Agency CLWA Santa Clarita Water Division Los Angeles County Waterworks District 36 Newhall County Water District Valencia Water Company June 2017 JUNE 2017 2016 SANTA CLARITA VALLEY WATER REPORT Table of Contents EXECUTIVE SUMMARY ....................................................................................................................... ES-1 ES.1 2016 Water Requirements and Supplies ............................................................................. ES-1 ES.2 Alluvial Aquifer ................................................................................................................... ES-2 ES.3 Saugus Formation............................................................................................................... ES-4 ES.4 Imported Water ................................................................................................................. ES-5 ES.5 Recycled Water ................................................................................................................... ES-6 ES.6 2017 Water Supply Outlook................................................................................................ ES-6 ES.7 Water Conservation ............................................................................................................ ES-8 1 INTRODUCTION .............................................................................................................................. 1 1.1 Background .............................................................................................................................. 1 1.2 Purpose and Scope of the Report ............................................................................................. 2 1.3 Santa Clarita Valley Water Purveyors ....................................................................................... 2 1.4 The Upper Santa Clara River Hydrologic Area and East Groundwater Subbasin ......................... 3 2 2016 WATER SUPPLIES AND USE .................................................................................................... 6 2.1 2016 Water Supplies ................................................................................................................ 6 2.2 Total Water Use Historical Trends ............................................................................................ 6 2.3 Municipal Water Use ................................................................................................................ 7 2.4 Agricultural and Other Water Uses ........................................................................................... 8 3 WATER SUPPLIES ............................................................................................................................ 9 3.1 Groundwater Basin Yield .......................................................................................................... 9 3.1.1 Historical Investigations .................................................................................................... 9 3.1.2 Current Operating Plan ................................................................................................... 10 3.2 Alluvium – General ................................................................................................................. 12 3.2.1 Alluvium – Current Conditions ........................................................................................ 13 3.2.2 Alluvium – Historical Conditions ..................................................................................... 13 3.3 Saugus Formation – General................................................................................................... 17 3.3.1 Saugus Formation – Current Conditions .......................................................................... 18 3.3.2 Saugus Formation – Historical Conditions ....................................................................... 18 3.4 Imported Water ..................................................................................................................... 19 3.4.1 State Water Project Table A and Imported Water Supplies ............................................. 20 3.4.2 2016 Imported Water Supply and Disposition ................................................................. 20 3.4.3 Other Imported Water Supplies ...................................................................................... 21 LUHDORFF AND SCALMANINI CONSULTING ENGINEERS ii JUNE 2017 2016 SANTA CLARITA VALLEY WATER REPORT 3.4.4 Banked Water Supplies ................................................................................................... 22 3.4.5 Imported Water Supply Capability .................................................................................. 23 3.5 Water Quality......................................................................................................................... 24 3.5.1 Water Quality – General ................................................................................................. 24 3.5.2 Groundwater Quality – Alluvium .................................................................................... 28 3.5.3 Groundwater Quality – Saugus Formation ...................................................................... 29 3.5.4 Imported Water Quality ................................................................................................. 29 3.6 Recycled Water ...................................................................................................................... 30 3.7 Santa Clara River .................................................................................................................... 31 3.8 Subsidence ............................................................................................................................. 32 4 SUMMARY OF 2016 WATER SUPPLY AND 2017 OUTLOOK ........................................................... 34 4.1 2016 Water Demand .............................................................................................................. 34 4.2 Projected 2017 Water Demand and Supplies .......................................................................... 35 4.3 SWP Delivery Capability ......................................................................................................... 35 4.4 Supplemental Water Supply Sources ...................................................................................... 36 4.5 Water Supply Strategy............................................................................................................ 37 5 WATER CONSERVATION ............................................................................................................... 39 5.1 Historical Conservation Efforts ............................................................................................... 39 5.2 Recent Conservation Efforts ................................................................................................... 39 5.3 Specific Conservation Efforts .................................................................................................. 41 5.3.1 Castaic Lake Water Agency ............................................................................................. 42 5.3.2 Valencia Water Company ............................................................................................... 42 5.3.3 Santa Clarita Water Division ........................................................................................... 43 5.3.4 Newhall County Water District ....................................................................................... 44 5.3.5 Los Angeles County Waterworks District 36 .................................................................... 44 5.4 2016 Water Use ..................................................................................................................... 44 6 REFERENCES ................................................................................................................................. 45 LUHDORFF AND SCALMANINI CONSULTING ENGINEERS iii JUNE 2017 2016 SANTA CLARITA VALLEY WATER REPORT List of Tables Page Table ES-1 Santa Clarita Valley Summary of 2016 Water Supplies and Uses ................................ ES-2 Table 2-1 Water Supply Utilization by Municipal Purveyors ................................................. (after) 6 Table 2-2 Individual Water Supply Utilization by Agricultural and Other Users .................... (after) 6 Table 2-3 Total Water Supply Utilization for Municipal, Agricultural and Other Uses ................................................................................................... (after) 6 Table 2-4 Service Connections by Purveyor .................................................................................... 8 Table 3-1 Groundwater Operating Plan for the Santa Clarita Valley.............................................. 11 Table 3-2 2016 CLWA Imported Water Supply and Disposition.......................................... (after) 20 Table 4-1 2017 Water Supply and Demand ....................................................................... (after) 34 Table 5-1 20x2020 Compliance GPCD Targets and Current Purveyor Levels.................................
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