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Addressing Nitrate in California’s Drinking Water With a Focus on Tulare Lake Basin and Salinas Valley Groundwater Report for the State Water Resources Control Board Report to the Legislature California Nitrate Project, Implementation of Senate Bill X2 1 Center for Watershed Sciences University of California, Davis http://groundwaternitrate.ucdavis.edu Prepared for the California State Water Resources Control Board The health of our waters is the principal measure of how we live on the land. —Luna Leopold Addressing Nitrate in California’s Drinking Water With a Focus on Tulare Lake Basin and Salinas Valley Groundwater Report for the State Water Resources Control Board Report to the Legislature This Report and its associated eight Technical Reports were prepared by Thomas Harter and Jay R. Lund Dylan B. Boyle, Holly E. Canada, Nicole (Principal Investigators) DeLaMora, Kristin N. Dzurella, Anna Fryjoff- Hung, Allan D. Hollander, Kristin L. Honeycutt, Jeannie Darby, Graham E. Fogg, Richard Howitt, Marion W. Jenkins, Vivian B. Jensen, Aaron M. Katrina K. Jessoe, G. Stuart Pettygrove, King, George Kourakos, Daniel Liptzin, Elena M. James F. Quinn, and Joshua H. Viers Lopez, Megan M. Mayzelle, Alison McNally, Josue (Co-Investigators) Medellin-Azuara, and Todd S. Rosenstock With project management support from Cathryn Lawrence and Danielle V. Dolan Center for Watershed Sciences • University of California, Davis Groundwater Nitrate Project, Implementation of Senate Bill X2 1 Prepared for California State Water Resources Control Board • January 2012 http://groundwaternitrate.ucdavis.edu Copyright ©2012 The Regents of the University of California Suggested citation: Harter, T., J. R. Lund, J. Darby, G. E. Fogg, R. Howitt, K. K. Jessoe, G. S. Pettygrove, J. F. Quinn, All rights reserved J. H. Viers, D. B. Boyle, H. E. Canada, N. DeLaMora, K. N. The University of California prohibits discrimination or Dzurella, A. Fryjoff-Hung, A. D. Hollander, K. L. Honeycutt, harassment of any person on the basis of race, color, national M. W. Jenkins, V. B. Jensen, A. M. King, G. Kourakos, D. origin, religion, sex, gender identity, pregnancy (including Liptzin, E. M. Lopez, M. M. Mayzelle, A. McNally, J. Medellin- childbirth, and medical conditions related to pregnancy or Azuara, and T. S. Rosenstock. 2012. Addressing Nitrate in childbirth), physical or mental disability, medical condition California's Drinking Water with a Focus on Tulare Lake Basin (cancer-related or genetic characteristics), ancestry, marital and Salinas Valley Groundwater. Report for the State Water status, age, sexual orientation, citizenship, or service in the Resources Control Board Report to the Legislature. Center uniformed services (as defined by the Uniformed Services for Watershed Sciences, University of California, Davis. 78 p. Employment and Reemployment Rights Act of 1994: service in http://groundwaternitrate.ucdavis.edu. the uniformed services includes membership, application for membership, performance of service, application for service, or obligation for service in the uniformed services) in any of its programs or activities. University policy also prohibits reprisal or retaliation against any person in any of its programs or activities for making a complaint of discrimination or sexual harassment or for using or participating in the investigation or resolution process of any such complaint. University policy is intended to be consistent with the provisions of applicable State and Federal laws. Contents List of Tables ................................................................v List of Figures ...............................................................vi Acknowledgments ...........................................................vii Acronyms and Abbreviations. viii Executive Summary . .. 1 Key Issues ..................................................................2 Summary of Key Findings ......................................................2 Findings: Sources of Nitrate Pollution .............................................3 Findings: Reducing Nitrate Pollution. .4 Findings: Groundwater Nitrate Pollution. 4 Findings: Groundwater Remediation ..............................................4 Findings: Safe Drinking Water Supply. 4 Findings: Regulatory, Funding, and Policy Options ...................................5 Promising Actions ............................................................5 Safe Drinking Water Actions ................................................5 Source Reduction Actions ..................................................6 Monitoring and Assessment. 6 Funding ................................................................7 1 Introduction . 9 2 Sources of Groundwater Nitrate . 15 2.1 Nitrogen Cycle: Basic Concepts ..............................................15 2.2 Sources of Nitrate Discharge to Groundwater ....................................15 Natural Nitrate Sources ...................................................15 Human Nitrate Sources ...................................................16 Groundwater Nitrate Contributions by Source Category ..........................17 Agricultural Sources ................................................17 Urban and Domestic Sources .........................................24 General Sources ...................................................29 2.3 Reducing Nitrate Source Emissions to Groundwater ..............................29 Reducing Nitrate Loading from Irrigated Cropland and Livestock Operations ..........29 Reducing Nitrate Leaching from Municipal Wastewater Treatment and Food Processing Plants ..............................................34 Reducing Nitrate Contributions from Leaking Sewer Pipes and Septic Systems .........34 Reducing Nitrate Leaching from Turfgrass in Urban Areas .........................34 Reducing Nitrate Transfer and Loading from Wells ..............................34 Addressing Nitrate in California’s Drinking Water iii 3 Impact: Groundwater Nitrate Occurrence . 35 3.1 Current Groundwater Quality Status ..........................................35 3.2 Cleanup of Groundwater: Groundwater Remediation ..............................36 3.3 Existing Regulatory and Funding Programs for Nitrate Groundwater Contamination ......39 The Dutch Experience ........................................................46 4 Impact: Drinking Water Contamination . 47 4.1 Susceptible Populations ....................................................47 4.2 Alternative Water Supply and Treatment .......................................51 Community Public Water System Options .....................................52 Self-Supplied Households and Local Small Water System Options ...................54 Treatment to Remove Nitrate ...............................................55 Consolidation and Regionalization ...........................................57 4.3 Comparison and Discussion. 58 Options for Small Community Public Water Systems ............................58 Options for Self-Supplied Households and Local Small Water Systems ...............60 4.4 Cost of Providing Safe Drinking Water .........................................62 5 Policy Options for Nitrate Source Reduction and Funding . 63 5.1 Nitrate Source Reduction Policy Options .......................................63 Major Findings: Future Source Reduction Options ..............................64 5.2 Funding Options .........................................................64 Major Findings: Future Funding Options .....................................65 Payment for Ecosystem Services in New York City ...................................66 6 Promising Solutions . 67 6.1 Areas of Promising Action ..................................................67 Safe Drinking Water Actions ...............................................67 Source Reduction Actions .................................................67 Monitoring and Assessment. .69 Funding ...............................................................69 6.2 Developing an Effective Solution Strategy ......................................70 Options without Tax Legislation ............................................70 Options Requiring Tax or Fee Legislation .....................................71 6.3 Getting Organized ........................................................71 Informational Actions ....................................................71 Task Forces ............................................................71 6.4 Dilemmas for State Action ..................................................72 7 Conclusions . 73 Literature Cited . 75 iv Addressing Nitrate in California’s Drinking Water Tables Table ES-1. Performance of state and agency actions for nitrate groundwater contamination .......8 Table 1. Major sources of groundwater nitrate. 18 Table 2. Major nitrogen fluxes to and from cropland ...............................26 Table 3. Total nitrogen discharge to land and average total nitrogen concentration in discharge ...........................................27 Table 4. Measures for improving nitrogen use efficiency and decreasing nitrate leaching ......30 Table 5. Effect of nitrate load reduction on applied water, revenues, crop area, and nitrogen application .....................................32 Table 6. Total number of wells and samples, location, nitrate concentration, and MCL exceedance ...............................................36 Table 7. Total groundwater and remediation volume by sub-basin .....................41 Table 8a. Programs and statutes for
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