2008 Santa Clarita Valley Water Report
Castaic Lake Water Agency (CLWA) CLWA Santa Clarita Water Division Los Angeles County Waterworks District 36 Newhall County Water District www.cnsm.csulb.edu Valencia Water Company
April 2009
Credit: Al Seib / Los Angeles Times Table of Contents
Page
Executive Summary ...... ES-1 ES.1 2008 Water Requirements and Supplies ...... 1 ES.2 Alluvial Aquifer...... 3 ES.3 Saugus Formation ...... 4 ES.4 Imported Water...... 5 ES.5 Recycled Water ...... 6 ES.6 2009 Water Supply Outlook...... 6
1. Introduction...... 1-1 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 ...... 3
2. 2008 Water Requirements and Supplies...... 2-1
3. Water Supplies ...... 3-1 3.1 Groundwater Basin Yield...... 1 3.2 Alluvium – General ...... 4 3.2.1 Alluvium – Historical and Current Conditions ...... 6 3.3 Saugus Formation – General...... 8 3.3.1 Saugus Formation – Historical and Current Conditions...... 9 3.4. Imported Water...... 10 3.4.1 State Water Project Table A Supplies...... 11 3.4.2 Other Imported Water Supplies...... 12 3.4.3 Imported Water Supply Reliability...... 13 3.5 Water Quality – General ...... 14 3.5.1 Groundwater Quality – Alluvium...... 17 3.5.2 Groundwater Quality – Saugus Formation ...... 18 3.5.3 Imported Water Quality ...... 18 3.6 Recycled Water ...... 18 3.7 Santa Clara River...... 19
4. Summary of 2008 Water Supply and 2009 Outlook ...... 4-1
5. Water Conservation ...... 5-1
6. References...... 6-1 Figures
(all figures follow their respective sections)
1-1 CLWA and Purveyor Service Areas
1-2 Santa Clara River Groundwater Subbasins
1-3 Annual Precipitation and Cumulative Departure from Mean Annual Precipitation at Newhall-Soledad 32c Gage
2-1 Total Water Supply Utilization Santa Clarita Valley
3-1 Alluvium and Saugus Formation Santa Clara River Valley, East Groundwater Subbasin
3-2 Groundwater Production - Alluvium Santa Clara River Valley, East Groundwater Subbasin
3-3 Alluvial Well Locations By Area Santa Clara River Valley, East Groundwater Subbasin
3-4 Groundwater Elevations in Eastern Santa Clarita Valley Alluvial Wells
3-5 Groundwater Elevations in Western Santa Clarita Valley Alluvial Wells
3-6 Annual Groundwater Production from Alluvium by Area (Acre-feet) Santa Clara River Valley, East Groundwater Subbasin
3-7 Saugus Well Locations Santa Clara River Valley, East Groundwater Subbasin
3-8 Groundwater Production – Saugus Formation Santa Clara River Valley, East Groundwater Subbasin
3-9 Groundwater Elevations in Saugus Wells
3-10 Treated Water Distribution System Castaic Lake Water Agency Figures, continued
(all figures follow their respective sections)
3-11 Groundwater Quality in Eastern Santa Clarita Valley Alluvial Wells
3-12 Groundwater Quality in Western Santa Clarita Valley Alluvial Wells
3-13 Groundwater Quality in Saugus Wells
3-14 Annual Average of Daily Mean Streamflow Santa Clara River
4-1 Historical and Projected Water Use Santa Clarita Valley Tables
Page
ES-1 Santa Clarita Valley Summary of 2008 Water Supplies and Uses...... ES-2 3-1 Groundwater Operating Plan for the Santa Clarita Valley...... 3-3
After Page
2-1 Water Supply Utilization by Municipal Purveyors...... 2-1 2-2 Individual Water Supply Utilization by Agricultural and Other Users ...... 2-1 2-3 Total Water Supply Utilization for Municipal, Agricultural and Other Uses..... 2-2 3-2 2008 CLWA Imported Water Supply and Disposition...... 3-12 4-1 2009 Water Supply and Demand...... 4-2