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Clear Lake Watershed Sanitary Survey Is a Report Made by the Clear Lake Water Utilities to the California Department of Health Services (DHS) On

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Clear Lake Watershed Sanitary Survey Is a Report Made by the Clear Lake Water Utilities to the California Department of Health Services (DHS) On PROJECT TEAM PARTICIPATING WATER UTILITIES Buckingham Park Water District Don Bradley Cache Creek Mobile Home Park Steve Grimshaw California Cities Water Company Paul Harris California Water Service Company Tom Fitzgerald City of Lakeport Mark Brannigan Clearlake Oaks County Water District Ellen Pearson Clearwater Mutual Water Company Don Bradley Michael Reust Crescent Bay Improvement Company Roberta Lyons Highlands Water Company Sam Lambert Konocti County Water District William Kochler Konocti Harbor Resort & Spa Jerry Lykkon Lake County Special Districts Steve Brodnansky Nicholas Ring Peggie King Mt. Konocti Mutual Water Company Alan Farr Nice Mutual Water Company Bradley Granger Richmond Park Resort Sharon Ferriera Rivera West Mutual Water Company Don Bradley Westwind Mobile Home Park John Franco Southern California Water Company* David Lancaster CONSULTANT TEAM Archibald & Wallberg Consultants Jeanne Wallberg MWH Americas, Inc. Bonny Starr Robert Zieman Jenni Haas Design Jenni Haas Engelhardt Word Processing Noreen Engelhardt OTHER PARTICIPANTS Department of Health Services – Mendocino District Bruce Burton Leah Walker *For California Cities Water Company TABLE OF CONTENTS LIST OF TABLES ................................................................................................................................. ii LIST OF FIGURES ................................................................................................................................ vi EXECUTIVE SUMMARY ..................................................................................................................ES-1 CHAPTER 1. INTRODUCTION Study Objectives .............................................................................................................................. 1-1 Study Participants .............................................................................................................................. 1-2 Study Area .............................................................................................................................. 1-2 Conduct of the Study .............................................................................................................................. 1-5 Report Organization and Guide .............................................................................................................. 1-6 CHAPTER 2. OVERVIEW OF CLEAR LAKE AND THE WATERSHED Watershed Characteristics........................................................................................................................ 2-1 Lake Characteristics .............................................................................................................................. 2-3 CHAPTER 3. WATERSHED ASSESSMENT Watershed Erosion .............................................................................................................................. 3-3 Agriculture ............................................................................................................................ 3-14 Hydrilla Eradication Program................................................................................................................ 3-22 Aquatic Plant Management.................................................................................................................... 3-29 Lake Recreation ............................................................................................................................ 3-34 Septic System Areas ............................................................................................................................ 3-44 Municipal Wastewater ........................................................................................................................... 3-52 Mining and Sulphur Bank Mine ............................................................................................................ 3-64 CHAPTER 4. LAKE WATER QUALITY AND TREATMENT REQUIREMENTS Primary Maximum Contaminant Levels.................................................................................................. 4-1 Secondary Maximum Contaminant Levels.............................................................................................. 4-1 Microbiological Constituents................................................................................................................... 4-2 Appropriate Level of Treatment for Pathogens ........................................................................... 4-3 Algae and Nutrients ............................................................................................................................ 4-10 Turbidity ............................................................................................................................ 4-11 Disinfection By-Product (DBP) Precursors........................................................................................... 4-12 Unregulated Constituents....................................................................................................................... 4-14 CHAPTER 5. INDIVIDUAL UTILITY ASSESSMENTS Buckingham Park Water District (BPWD).............................................................................................. 5-2 Cache Creek Mobile Home Park (CCMHP)............................................................................................5-8 California Cities Water Company (CCWC) ..........................................................................................5-13 California Water Service Company (CWSC)........................................................................................ 5-29 Clearlake Oaks County Water District (CLOCWD) ............................................................................. 5-35 Final Report i TABLE OF CONTENTS (continued) Clearwater Mutual Water Company (CMWC)...................................................................................... 5-46 City of Lakeport ............................................................................................................................ 5-51 Crescent Bay Improvement Company (CBIC)...................................................................................... 5-56 Highlands Water Company (HWC)....................................................................................................... 5-61 Konocti County Water District (KCWD) .............................................................................................. 5-66 Konocti Harbor Resort & Spa (KHRS) ................................................................................................. 5-72 Lake County Special Districts – North Lakeport................................................................................... 5-78 Lake County Special Districts – Soda Bay............................................................................................ 5-83 Mount Konocti Mutual Water Company (MKMWC)........................................................................... 5-88 Nice Mutual Water Company (NMWC)................................................................................................5-95 Richmond Park Resort (RPR).............................................................................................................. 5-101 Riviera West Mutual Water Company (RWMWC)............................................................................. 5-106 Westwind Mobile Home Park (WMHP).............................................................................................. 5-111 CHAPTER 6. DISCUSSION AND RECOMMENDATIONS Discussion .............................................................................................................................. 6-1 Recommendations .............................................................................................................................. 6-6 APPENDIX A LIST OF CONTACTS AND BIBLIOGRAPHY APPENDIX B WATER QUALITY CONSTITUENT INFORMATION APPENDIX C REGULATIONS SUMMARY APPENDIX D RECREATION BROCHURE INFORMATION APPENDIX E DEPARTMENT OF WATER RESOURCES MONITORING DATA APPENDIX F INDIVIDUAL UTILITY INFORMATION APPENDIX G LAKE COUNTY LEAKING UNDERGROUND STORAGE TANKS Final Report ii LIST OF TABLES Table 1-1 Protection Zone Delineations.............................................................................................. 1-5 Table 1-2 Guide to Report Contents ................................................................................................... 1-6 Table 3-1 Total Sediment Yield to Clear Lake ................................................................................... 3-4 Table 3-2 Erosion and Sediment Control Projects .............................................................................. 3-8 Table 3-3 Chronology of Grape Plantings in Lake County............................................................... 3-16 Table 3-4 Acreage and Pesticides Used: Grapes, Walnuts, and Pears.............................................. 3-17 Table 3-5 Characteristics of Pesticides Used on Grapes, Walnuts, and Pears .................................. 3-17 Table 3-6 Reported Use of Simazine and Ziram in Lake County, Pounds ....................................... 3-18 Table 3-7 Recent Vineyard Acreage Planted under Permit .............................................................. 3-19 Table 3-8 Simazine Detections at Clear Lake Water Utility Intakes ................................................ 3-20 Table 3-9 Chronology of Hydrilla Infestation
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