1710 Soscol Avenue
Napa, CA 94559-1315
David Lewis is Director of the University of California Cooperative Extension offices in Marin and Napa Counties and the Watershed Management Advisor in the North Bay. In 2019 he stepped into the UC Agriculture and Natural Resources Water Strategic Initiative Leader role. He is a Carleton College graduate and holds a Master’s of Science degree in International Agricultural Development from UC Davis. His training and background are in geology, soils, and watershed hydrology.
He is a returned Peace Corps Volunteer, having contributed to the African Food Systems Initiative in Niger, West Africa from 1990 to 1992. He subsequently developed programs and trained volunteers in Zimbabwe and Albania.
In his role as UCCE County Director, he oversees all research and extension programs in Marin and Napa Counties, bringing research and science-based information to bear on local community needs and issues. As Watershed Management Advisor, he develops and implements projects that integrate resource conservation with agricultural land use management. He is committed to developing and disseminating the tools and practices that support beneficial contributions of working landscapes to local economies and the environment.
SpecialtyWater and Watershed Management and Research, Community Development, Sustainable Agricutlure
Areas of Expertise (click to see all ANR academics with this expertise)
- Livestock and Dairy - Other
- Soil and Land - Other
- Wetland and Riparian Systems
- Watersheds and River Basins - Other
- Natural Resources and Environment
- Conservation and Efficient Use of Water
- Watershed Protection and Management
- Weather and Climate
- Pollution Prevention and Mitigation
- Aquatic and Terrestrial Wildlife
- Economics, Markets, and Policy
- Natural Resource and Environmental Economics
Meyer D, Karle B, Heguy J, Lewis D, Stackhouse J, Mullinax D. 2019. UC-industry-agency partnerships influence and help implement dairy water quality policy.Calif Agr 73(1):40-47. https://doi.org/10.3733/ca.2018a0042.
- Lewis, D.J.; Voeller, D (2019). Management Scale Assessment of Practices to Mitigate Cattle Microbial Water Quality Impairments of Coastal Waters. Sustainability. 2019:11, 10.
- Sals, W.B.; Larsen, R.E. (2018). Modeled soil erosion potential is low across California’s annual rangelands. California Agriculture. 72:3, 179-191.
- das Gracas, C. ; Pereira, M. (2013). "The occurrence of subtilase-cytotoxin-encoding genes in environmental Escherichia coli isolated from a Northern California estuary." Canadian Journal of Microbiology 55: 437-441.
- Lewis, D.; Atwill, E. (2012). "Spatial and Temporal Dynamics of Fecal Coliform and Escherichia coli Associated with Suspended Solids and Water within Five Northern California Estuaries." Journal of Environmental Quality(42): 229-238.
- George, M.; Larson-Praplan, S. (2011). "California's rangeland water quality management plan: An update." Rangelands 33(1): 20-24.
- Lewis, D. ; Atwill, E. (2010). "Management of microbial contamination in storm runoff from California coastal dairy pastures." Journal of Environmental Quality 39(5): 1782-9.
- Lewis, D.; Atwill, E. (2010). "Reducing microbial contamination in storm runoff from pastures on California coastal dairies." Journal of Environmental Quality 39: 1782-1789.
- O'Geen, A.; Dahlgren, R. (2010). "Research connects soil hydrology and stream water chemistry in California oak woodlands." California Agriculture 64(2): 78-84.
- Lennox, M.; Lewis, D. J. (2009). "Development of Vegetation and Aquatic Habitat in Restored Riparian Sites of California's North Coast Rangelands." Restoration Ecology 19(2)
- Lewis, D. ; Atwill, E. (2009). "Reducing microbial contamination in storm runoff from high use areas on California coastal dairies." Water Science & Technology 60(7): 1731-1743.
- Lewis , D.; Lennox, M. (2008). Developing a monitoring program for riparian revegetation projects. Davis, Ca, University of California Agriculture and Natural Resources Communication Services. Publication #8363, 16.
- Miller, W.; Lewis, D. (2008). "Farm factors and beneficial management practices (BMPs) associated with reducing Cryptosporidium loading in storm runoff from dairy high use areas." Journal of Environmental Quality 37(5): 1875-82.
- Lile, D.; Tate, K. (2008). Management options to reduce microbial, nutrient, and sediment pollutants in runoff from grazed, irrigated pastures. Davis, California, University of California Agriculture and Natural Resources Communication Services. 2008.
- Miller, W.; Lewis, D. (2007). "Climate and on-farm risk factors associated with Giardia duodenalis cysts in storm runoff from California coastal dairies." Applied and Environmental Microbiology 73(21): 6972--6979.
- Lennox, M.; Lewis , D. (2007). Water Quality Treatment for Livestock Feeding and Exercise Areas on California Coastal Dairy Farms and Ranches. University of California Division of Agriculture and Natural Resources. Publication 8210.
- Ristow, P.; Pettygrove, G. (2006). California Dairies: Protecting Water Quality. University of California, Davis, CA, University of California Agriculture and Natural Resources. Publication 21630.
- Opperman, J.; Lewis, D. (2006). Maintain Wood in Streams: A Vital Action for Fish Conservation. Oakland, CA, University of California Agriculture and Natural Resources. Publication 8157, 11.
- Lewis, D. ; Singer, M. (2006). "Nitrate and sediment fluxes from a California rangeland watershed." Journal of Environmental Quality 35(6): 2202-11.
- Lewis , D.; Singer, M. (2006). "Nutrient and Sediment Fluxes from a California Rangeland Watershed." Journal of Environmental Quality 35: 2202-2211.
- Harper, J.; Lewis , D. (2006). Sediment Delivery Inventory and Monitoring: A Method for Water Quality Mangement in Rangeland Watersheds. Instructional Video. Davis, CA, University of California Agriculture and Natural Resources Communication Services. 28 minutes.
- Gerstein, J.; Lewis , D. (2006). State and Federal Approach to Control of Nonpoint Sources of Pollution. Oakland, CA, University of California Agriculture and Natural Resources. Publication 8203, 7.
- Larsen, R.; Smith, K. (2005). "Evaluation of California's Rangeland Water Quality Education Program." Rangeland Ecology & Management 58(5): 514-522.
- Lewis, D.; Atwill, E. (2005). "Linking On-Farm Dairy Mangement Practices to Storm-Flow Fecal Coliform Loading for California Coastal Watersheds." Environmental Monitoring and Assessment 107: 407-425.
- Larsen, R.; Lewis, D. (2005). Watershed Management in Oak Woodlands. Davis, CA, University of California Agriculture and Natural Resources.
- Lewis, D.; Tate, K. (2002). Turbidity and total suspended solid concentration dynamics in streamflow from California Oak Woodland Watersheds. Fifth Symposium on Oak Woodlands: Oaks in California Changing Landscape (Proceedings).R. Standiford, D. McCreary, K. Purcell and . (Technical Coordinators). San Diego, CA, Pacific Southwest Research Station, Forest Service, United States Department of Agriculture. General Technical Report PSW-GTR-184, 104-118.
- Lewis , D. ; Tate, K. (2001). "Locating sediment sources on California's North Coast rangelands." California Agriculture 55(4): 32-38.
- Lewis, D.; Vance, L. (2001). Stream Temperature in the Garcia River: The Relationships of Air Temperature, Canopy, and Geographic Position to Stream Thermodynamics. Riparian and Floodplain Conference Proceedings, Sacramento, CA, USDA (United States Department of Agriculture), USFS (United States Forest Service).
- Dahlgren, R.; Tate, K. (2001). "Watershed research examines rangeland management effects on water quality." California Agriculture 55(6): 64-71.
- Tate, K.; Nader, G. (2000). "Evaluation of buffers to improve the quality of runoff from irrigated pastures." Journal of Soil and Water Conservation 55(4): 473-478.
- Lewis, D.; Singer, M. (2000). "Hydrology in a California oak woodland watershed." Journal of Hydrology 240: 106-117.
- Lewis, D.; Tate, K. (2000). Sediment delivery monitoring: A water quality tool for California Rangeland watersheds. Davis, CA, University of California Agriculture and Natural Resources. Publication. 2000.
- Lewis, D.; Singer, M. (1999). "Applicability of SCS Curve Number Method for a California oak woodlands watershed." Journal of Soil and Water Conservation 55(2): 226-230.
- Lewis, D. (1999). Water quality and yield in a California oak woodland watershed: A 17-year study. University of California, Davis. Master of Science.
ANR Workgroup Associations
- Dairy Quality Assurance - Member
- Environmental Education - Member
- Environmental Flows - Member
- Fire - Member
- Oak Woodland Conservation - Member
- Wildlife - Member