Surface Water Protection Program

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These projects were funded by contracts with the Department of Pesticide Regulation (DPR) of the California Environmental Protection Agency. The statements and conclusions in these reports are those of the contractors and not necessarily those of the California Department of Pesticide Regulation. The mention of commercial products, their source, or their use in connection with material reported herein is not to be construed as actual or implied endorsement of such products.

Contract Number Contract Description
16-C0102 Modify the Tembladero treatment system to incorporate additional processing steps that specifically treat neonicotinoids and other water soluble contaminants. Ron Tjeerdema, UC Davis, April 2017-June 2019. Workplan (PDF 878 kb).

Progress Report, PDF (53 kb)

Contract Manager: Xin Deng

16-C0085 Isolate, characterize, and test microbes to degrade pesticides in woodchip bioreactors. Arlene Haffa, CSU Monterey Bay. Workplan (PDF 974 kb).

Contract Manager: Xin Deng

FY16-17 Year End Report, PDF (190 kb)

16-C0084 Develop novel molecular biomarkers that can evaluate the impact of chlorantraniliprole and imidacloprid exposures in aquatic invertebrates and fish. Simone Hasenbein UC Davis, Erika Holland CSU Long Beach. Jan 1, 2017- Dec 31, 2017. Workplan (PDF 2.7 mb).

Contract Manager: Xin Deng

Status Report July 2017, PDF (211 kb)

16-C0051 California Department of Fish & Wildlife will analyze surface water and sediment samples for pyrethroids and fipronils. Workplan (PDF 351 kb).

Contract Manager: Robert Budd

15-C0104 California Department of Fish & Wildlife (CDFW) shall analyze surface water, sediment samples, and Continuous Low Level Aquatic Monitoring (CLAM) discs for pesticide residue. May 2016-April 2018. Workplan (PDF 55 kb).

Contract Manager:Xin Deng

15-C0087 Development of a sunlight-driven, activated carbon-based electrolysis system for the passive remediation of pesticide-impacted drainage channels. Workplan (PDF 1.1 mb).

Contract Manager: Dan Wang

15-C0081 Understanding Sources and Transport of Fipronil in Urban Environments. Jay Gan, UC Riverside, March 21, 2016 - June 30, 2018 Workplan (PDF 639 kb)

Contract Manager: Yuzhou Luo

15-C0056 Training Pesticide Control Operators (PCOs) and PCO Companies in Urban Pyrethroid Applications. Loren Oki and Karey Windbiel-Rojas, UC Davis. Feb 1, 2016–Dec. 31, 2018. Workplan (PDF 654 kb)

Workshop Agenda PDF (91 kb)

Meeting survey PDF (166 kb)

First Annual Report. (1.9 mb)

Contract Manager: Mike Ensminger

15-C0055 Develop statistical methodology to estimate pesticide concentration and produce novel statistical data analysis tools to support DPR's applications. Alexander Aue, UC Davis. Oct 1, 2015–July 31, 2018. Workplan (PDF 1 mb)

Contract Manager: Dan Wang

15-C0003 Flow and sample collection of urban runoff monitoring data in southern California. Darren Haver. July 2015–June 2017. Workplan (PDF 469 kb)

Contract Manager: Robert Budd

14-C0103 Develop, validate, and demonstrate analytical methods to quantify the concentrations of a target list of pesticides in municipal wastewater influent and effluent and scan for the presence of other pesticides and adjuvants. Tom Young, UC Davis. May 2015–April 2017. Workplan (PDF 300 kb)

Amendment, PDF (35 kb)

Contract Manager: Jennifer Teerlink

Final Report, PDF (1.1 mb)

14-C0102 Effects of Application Methods on Fipronil Runoff Potential and Ant Control Efficacy. Les Greenberg et al. UC Riverside. May 2015-April. 2017. Workplan (PDF 794 kb).

Contract Manager: Mike Ensminger

Year End Report, PDF (192 kb)

Presentation 113, PDF (772 kb)

Final Report, PDF (488 kb)

14-C0029 Pyrethroids in Urban Stream Sediments: System modeling, Recovery rates, and Sampling Strategies Thomas M. Young and Fabian A. Bombardelli. UC Davis. Nov 17, 2014-Sept 30, 2017. Workplan (PDF 620 kb).

Contract Manager: Yuzhou Luo

Amendment 2016, PDF (351 kb)

14-C0012 Evaluate the Effectiveness of Shredded Plastics in Mitigation Pesticide Runoff in Surface Water. Ron Tjeerdema. UC Davis. July 2014-Dec. 2015. Workplan (PDF 2.4 mb).

Contract Manager: Robert Budd

Final Report, PDF (380 kb)

13-C0062 Development of Passive Samplers for Ambient Monitoring of Pesticides in Water. Jay Gan, UC Riverside. Workplan (PDF 2.6 kb).

Contract Manager: April DaSilva

13-C0052 Northern California urban pesticide monitoring and mitigation. Loren Oki, UC Davis. Workplan (PDF 692 kb).

Amendment, PDF (620 kb) (Sept 30, 2016)

Amendment, PDF (433 kb) (March 31, 2018)

Projective objectives: 1) conduct surface water monitoring from storm drain outfalls and creeks; 2) install automated sampling equipment at the outfall of a constructed water quality treatment pond; 2) maintain flow meters and collect flow measurements from monitoring sites in Folsom, CA.

Contract Manager: Michael Ensminger

13-C0031 Evaluation of pesticide active ingredients and formulations runoff from constructed wall and an abutting sloping cement pad. Les Greenberg, UC Riverside. Workplan (PDF 3.3 mb). (Project funded by US EPA Performance Partnership Grant)

Contract Manager: Michael Ensminger

Progress Report, PDF (280 kb) October 7, 2014

Poster, PDF (255 kb): Insecticide Runoff from Homes Treated for Ant Infestations (Aug. 2014)

Publication: Practical Pest Management Strategies to Reduce Pesticide Runoff for Argentine Ant (Hymenoptera: Formicidae) Control. Les Greenberg, M K. Rust, J Richards, XQ Wu, J Kabashina, C Wilen, J Gan, DH Choe J. Econ. Entomol. 107(6): 21472153 (2014); DOI:

Final Report, PDF (380 kb)

13-C0029 Laboratory and In-situ Assessment of Exposures of Aquatic Organisms in an Urban Environment in Northern California (Aug 2013 - June 2016). Swee Teh, UC Davis. Workplan (PDF 810 kb).

Contract Manager: Xin Deng

Progress Report, PDF (398.7 kb)

Final Report, PDF (579 kb)

Appendix to Final Report, PDF (375 kb)

13-C0027 Combined On-Farm Practices to Reduce Chlorpyrifos in Agricultural Runoff. Michael Cahn, Brian Anderson, Bryn Phillips. UC Davis. Workplan (PDF 1.1 mb).

Contract Manager: Robert Budd

Final Report, PDF (380 kb)

13-C0024 96-Hour Water Column Toxicity Tests Using Hyalella Azteca or Ceriodaphnia Dubia. Swee Teh, UC Davis, July 2013-Dec. 2014. Amended to Sept. 2016. Amendment Workplan (PDF 150 kb)

Amendment PDF (229 kb) (June 30, 2019)

Contract Manager: Michael Ensminger

13-C0022 Assessment of Pesticide Mixtures of Lambda-Cyhalothrin, Permethrin, Chlorpyrifos on Aquatic Organisms. Sharon Lawler. UC Davis. July 2013-June 2014. Workplan (PDF 496 kb)

Contract Manager: Xin Deng

Final Report, PDF (757 kb)

Simone Hasenbein et al. 2015. A Long-term Assessment of Pesticide Mixture Effects on Aquatic Invertebrate communities. Environ Toxicol Chem 9999:1-15.

13-C0002 Source evaluation and mitigation of off-site movement of pesticides from residential homes Jay Gan, UC Riverside, July 2013 - April 2016. Workplan (PDF 634 kb)

Contract Manager: Yuzhou Luo

Progress Report 2014, PDF (321 kb)

Richards, J., Reif, R., Luo, Y., Gan, J. 2016. Distribution of pesticides in dust particles in urban environments.Environ. Pollution. 214: 640-647.

12-C0064 Support for the Stream Pollution Trends Monitoring Program. Dave Crane. May 2013 - April 2016. Workplan (PDF 324 kb)

Contract Manager: Robert Budd

11-C0118 Efficacy of enzymes in reducing pesticide concentration and potential impact on aquatic macroinvertebrates. Ron Tjeerdema, Brian Anderson, Bryn Phillips. UC Davis. Workplan (PDF 2.9 mb).

Contract Manager: Robert Budd

Final Report, PDF (736 kb)

11-C0115 Development of Passive Samplers for Pesticides in Surface Water (June 2012-14). Ron Tjeerdema, UC Davis. Workplan (PDF 1.4 mb).

Contract Manager: Robert Budd

Final Report, PDF (2.2 mb)
Appendix, PDF (540 kb)
Supplemental Information, PDF (142 kb)

11-C0111 Modifications to HYDRUS2/3D (June 2012-14). Workplan (PDF 511 kb).

Contract Manager: Yuzhou Luo

Progress Report 2014, PDF (128 kb)

11-C0090 Modification of Root Zone Water Quality Model. (RZWQM) for simulating pesticide runoff from California agricultural fields. Workplan, PDF (495 kb).

Contract Manager: Xuyang Zhang

Final Report, PDF (1.4 mb) December 5, 2014

Progress Report, PDF (36 kb) September 27, 2014

Download RZWQM (v 2.9)
Username: patbcodeftp
Password: liberty7
Go to Directory : RZWQM2 Install In House (CURRENT)
Select "RZ2V291setup.exe" and Download

11-C0086 Evaluation of pesticide runoff from constructed wall and an abutting sloping cement pad. Les Greenberg, UC Riverside. Workplan (PDF 1.6 mb).
(Project funded by US EPA Cooperative Agreement)

Contract Manager: Michael Ensminger

Final Report, PDF (637 kb)

Runoff from Concrete Wall.
Les Greenberg and Mike Rust.
June 14, 2013

10-C0121 Pesticide formulation: effects on washoff from concrete and modeling of transport. Tom Young, UC Davis, Workplan (PDF 1.6 mb).

Project objectives: 1) Understand the role of pesticide formulation in washoff from concrete; and 2) coupled measurement and modeling of active ingredient and adjuvant transport.

Contract Manager: Yuzhou Luo

10-C0120 The effects of pesticides on copepods and population dynamic model for copepod in the San Francisco Estuary. Swee Teh, UC Davis, Workplan (PDF 690 kb).

Project objectives: 1) Determine the acute and chronic toxicity of pesticides on copepods; 2) Determine the influence of abiotic factors on the toxicity; and 3) Develop a population dynamic model for copepod populations in the San Francisco Estuary.

Contract Manager: Michael Ensminger

Final Report, PDF (306 kb)

The Acute and Chronic Effects of Pesticides on the Calanoid copepods, Eurytemora affinis and Pseudodiaptomus forbesi, of the San Francisco Estuary.
Swee Teh, Sarah Lesmeister, Bruce G Hammock
University of California-Davis
June 30, 2013

10-C0103 Northern California urban pesticide monitoring, runoff mitigation, and aquatic toxicity of pesticides in urban drains and creeks. Loren Oki, UC Davis, Workplan (PDF 846 kb).

Project Objectives: 1) monitor pesticide concentration in urban storm drains, 2) assess the effectiveness of mitigation measures, and 3) test aquatic toxicity of runoff waters and sediments.

Contract Manager: Michael Ensminger

Final Report, PDF (91 kb)

10-C0102 Monitoring, mitigation, and ELISA method development for surface water and bed

Project objectives: 1) monitoring and mitigation of pesticides in surface water, 2) assist in the data entry and analysis for various databases, and 3) validate commercial ELISA kits.

Contract Manager: Robert Budd

Final Report, PDF (395 kb)

10-C0101 Monitoring surface water runoff from Southern California watersheds. Darren Haver, UC Davis. Workplan (PDF 341 kb).

Project objectives: 1) track rainstorm events for potential runoff, 2) manage autosamplers and sampling stations, 3) collect data from sampling stations.

Contract Manager: Robert Budd

10-C0096 Assessing the complex effects of pesticide mixtures on aquatic community structure, integrating environmental stressors, biological interactions, recovery potential and re colonization following contaminant exposure. Sharon Lawler, UC Davis. Workplan (PDF 1.12 mb).

Project objectives: 1) How do aquatic communities respond to pesticide mixture exposure? 2) What are the consequences of changes in community structure? 3) How do contaminant mixtures affect predator-prey interactions?

Contract Manager: Xin Deng

Final Report, PDF (757 kb)

Simone Hasenbein, Sharon P. Lawler, Juergen Geist, Richard E. Connon 2015. The use of growth and behavioral endpoints to assess the effects of pesticide mixtures upon aquatic organisms. Ecotoxicology: DOI 10.1007/s10646-015-1420-1

10-C0086 Pyrethroid pesticides in municipal wastewater: sources, treatment effectiveness, effluent quality, and receiving water monitoring. Don Weston, UC Berkeley. Workplan (PDF 737 kb).

Project objectives: 1) characterize municipal wastewater influence, 2) measure pyrethroid removal efficiency of the treatment system, and 3) conduct toxicity test on effluence and monitor receiving waters for pyrethroids and toxicity.

Contract Manager: Xin Deng

10-C0085 Transfer processes and mitigation measures for pesticide runoff from homes. Jay Gan, UC Riverside. Workplan (PDF 877 kb).

Project objectives are 1) to better understand transfer of pesticide residues between landscape compartments, and to identify the most important source(s) for pesticide contamination of residential runoff; and 2) to quantitatively evaluate a number of pesticide application and landscape:related mitigation options for their effectiveness at reducing the volume and/or level of pesticide contaminated runoff from residential homes.

Contract Manager: Xuyang Zhang

Final Report, PDF (142 kb)
Urban Pesticides Fate and Transport in Hard Surfaces

Weiying Jiang and Jay Gan 2012. Importance of Fine Particles in Pesticide Runoff from Concrete Surfaces and Its Prediction. Environ. Sci. Technol. 2012, 46, 6028:6034.

Pesticides on Residential Outdoor Surfaces: Environmental Impacts and Aquatic Toxicity. 2015. Weiying Jiang, Yuzhou Luo, Jeremy L Conkle, Juying Lia, and Jay Gan. Pest Manag Sci DOI 10.1002/ps.4168

09-C0079 Adaptation of innovative vegetated treatment systems and pesticide breakdown technologies to improve water quality in runoff from irrigated vegetable production. Ron Tjeerdema, UC Davis. Workplan (PDF 1.3 mb).

Project: 1) develop grassed waterway and constructed wetland conservation practices to optimize treatment of tailwater runoff; 2) optimize Landguard to hydrolyze environmentally-relevant concentrations of diazinon and chlorpyrifos, and produce quantitative information on dosages and mixing times; 3) transfer the results in an interpretive report and outreach.   Term: December 2009 to October 2011.

Contract Manager: Robert Budd

Final Report, PDF (1 mb)

Optimization of an Integrated Vegetated Treatment System Incorporating Landguard A900 Enzyme: Reduction of Water Toxicity Caused by Organophosphate and Pyrethroid Pesticides, Bryn M. Phillips, Brian S. Anderson, Katie Siegler, Jennifer P. Voorhees, and Ron S. Tjeerdema Final Report 09:C0079

08-C0132 Development of Outreach Materials for Mitigating Pesticide Runoff in Urban Environments. Joyce Strand, UC Statewide IPM Program. Work Plan, PDF (PDF 523 kb).

Project: to refine and prepare unbiased, up-to-date, effective, and scientifically based outreach materials that may be used by landscapers, maintenance gardeners, structural applicators, nursery and garden center staff, and residential users. The outreach materials (e.g., online training modules, videos, interactive online resources, consumer-oriented printed materials) will provide information to help these user groups prevent and reduce pesticide runoff in urban environments. Term: April 2009 to March 2011.

Contract Manager: Nan Singhasemanon

Final Report, PDF (2.6 mb)

Products for pesticide mitigation outreach. Joyce Strand, Cheryl Wilen, Darren Haver, Jay Gan, Mary Louise Flint, Cheryl Reynolds, and Scott Parker. Presented at DPR on Dec 14, 2011.

08-C0093 Ant Control Efficacy and Surface Water Impacts. Les Greenberg, UC Riverside.

Project: Research to further evaluate the efficacy and surface water impact of different ant control methods in an urban setting.  Term: October 2008 to June 2011.

Contract Manager: Sheryl Gill

08-C0085 Evaluation of Lot-Level BMPs for Reducing Pesticide Runoff from Residential Homes. Jay Gan, UC Riverside.

Project: A research study implementing field experimental trials to determine the effects of various impervious surfaces around homes and various pesticide formulations on pesticide runoff potential. The results of this research will help DPR promulgate measures to prevent contamination of surface waters from runoff from urban areas.  Term: September 2008 to June 2011.

Contract Manager: Frank Spurlock

Final Report:

Weiying Jiang, Darren Haver, Michael Rust, Jay Gan 2012. Runoff of pyrethroid insecticides from concrete surfaces following simulated and natural rainfalls. Water Research 4 6:6 4 5-6 5 2.

06-0129C Pesticide Hard Surface Wash-Off Study. Jay Gan, UC Riverside.

Project: A research study on sorption, persistence, and mobility of selected pesticides on urban hard-scape materials. A mathematical model will be developed to describe off-site movement of pesticides from urban surfaces.  Term: June 2007 to May 2009.

Contract Manager: Frank Spurlock

Final Reports:

Jiang, W., K. Lin, D. Haver, S. Qin, G. Ayre, F. Spurlock, and J. Gan. 2010. Wash-off Potential of Urban Use Insecticides on Concrete Surfaces. Environ. Toxicol. Chem. 29:1203-1208.

Jiang, W, J. Gan, and D. Haver. 2010. Sorption and Desorption of Pyrethroid Insecticide Permethrin on Concrete. Environ. Sci. Technol. 45: 602-607

06-0086C Mitigation of Urban Use Pesticides in Surface Water Runoff. Tom Young, UC Davis

Project: This agreement will assist DPR in meeting the needs of protecting surface water from pesticide runoff by providing research in mitigating runoff from insecticide treatment of pests, in evaluating the source, fate, transport, and control of urban use pesticides in urban stream systems.  Term: January 5, 2007 through October 31, 2009

Contract Manager: Sheryl Gill

Final Report:

Dang Quoc Thuyet, Brant C. Jorgenson, Christopher Wissel-Tyson, Hirozumi Watanabe, Thomas M. Young. 2012. Wash off of imidacloprid and fipronil from turf and concrete surfaces using simulated rainfall. Science Total Environment: 414: 515-524

05-0108C Source, Fate, and Transport of Urban Use Pesticides in Urban Stream Systems. Tom Young, UC Davis

Project: This research study will address gaps in existing data related to the application, wash-off, and sources of pesticides detected in urban waterways.  Term: November 2006 to November 2009.

Contract Manager: Sheryl Gill

Final Report:

Jorgenson B. and T. Young. 2010. Formulation Effects and the Off-Target Transport of Pyrethroid Insecticides from Urban Hard Surfaces. Environ. Sci. Technol. 44:4951-4957.

05-0095C Bait Stations for Ant Control in Parks, Residential, and Commercial Areas. Les Greenberg, UC Riverside.

Project: A research study to evaluate the efficacy, acceptability, and surface water impacts of insect control bait stations in an urban setting. The study will determine the impact of ant treatments on surface water runoff to storm drains.  Term: May 2006 to March 2009.

Contract Manager: Sheryl Gill

Final Reports:

Greenberg, Les, M. K. Rust, J. H. Klotz, D. Haver, J. N. Kabashima, S. Bondarenkoc and J. Gan. 2010. Impact of Ant Control Technologies on Insecticide Runoff and Efficacy. Pest Manag Sci 66: 980- 987.

Klotz, J.H., M. K. Rust, L. Greenberg and M.A. Robertson. 2009. Developing Low Risk Management Strategies for Argentine Ants (Hymenoptera: Formicidae) Sociobiology 55:779-785.

Klotz, J.H., M. K. Rust, H. C. Field, L. Greenberg and K. Kupfer. 2009. Low Impact Directed Sprays and Liquid Baits to Control Argentine Ants (Hymenoptera: Formicidae). Sociobiology 54:101-108.

Klotz, J.H., M. K. Rust, H. C. Field, L. Greenberg and K. Kupfer. 2008. Controlling Argentine Ants in Residential Settings (Hymenoptera: Formicidae). Sociobiology 51:1-10.

05-0089C Use of Constructed Wetlands to Mitigate Pesticides in Runoff. Jay Gan, UC Riverside.

Project: A research project to evaluate the effectiveness of constructed wetlands to mitigate and remove pesticides from surface water runoff. This will help determine the influence of wetland characteristics on retention and degradation of insecticides in surface water.  Term: April 2006 to March 2009.

Contract Manager: Sheryl Gill

Final Report:

Budd, R., A. O’Geen, K.S. Goh, S. Bondarenko, and J. Gan. 2009. Efficacy of Constructed Wetlands in Pesticide Removal from Tailwaters in the Central Valley, California. Environ. Sci. Technol. 43, 2925-2930.

05-0101C Tracking Non-residential Pesticide Use in Urban Areas of California. M.L. Flint, UC Davis

Recent DPR studies on urban pesticide runoff suggest that although residential users likely contribute a large portion of pesticides to urban runoff, other groups of urban users may also be significant contributors. This projects goal was to first comprehensively identify these non-residential urban user groups and then expand our understanding of their pesticide acquisition, use, and disposal practices. The information gathered in this assessment (in combination with those from recent DPR residential user surveys) will then be used to create the most promising comprehensive urban pesticide user outreach strategy. The project's study areas will include the watersheds of Arcade Creek (Sacramento County), San Diego Creek/Upper Newport Bay (Orange County), and Chollas Creek (San Diego County).
Contract Manager: Nan Singhasemanon

Final Report, PDF (9.77 mb)

Kreidich, N., M.L. Flint, C.A. Wilen, M. Zhang. 2005.
Tracking Non-Residential Pesticide Use in Urban Areas of California . University of California Statewide IPM Project.

SWC 04-01 Bioavailability of pyrethroids in aquatic systems: Effect of suspended sediment and dissolved organic matter partitioning on acute toxicity of pyrethroids in the water column and in bed sediments.

Evaluate bioavailability of pyrethroids in aqueous/suspended sediment systems, and develop/validate a model that enables prediction of toxicity using LC50 values (determined in water) and basic properties of the aqueous sample, e.g. suspended solid content and dissolved organic carbon (DOC). Extend model to pore water exposures in bed sediments and validate using biomimetic samplers.

Gan, J. 2004-2006, UC Riverside Workplan (PDF 25 kb).
Contract Manager: Frank Spurlock

Final Reports:

Hunter, W., Y. Zu, F. Spurlock, and J. Gan. 2008. Using Disposable Polymethylsiloxane Fibers to Assess the Bioavailability of Permethrin in Sediment. Environ. Toxicol. Chem. 27: 568-575.

Xu, Y., J. Gan, Z. Wang, and F. Spurlock. 2008. Effect of Aging on Desorption Kinetics of Sediment-Associated Pyrethroids. Environ. Toxicol. Chem. 27: 1293-1301.

Xu, Yiping, Frank Spurlock, Zijian Wang,and J. Gan. 2007. Comparison of Five Methods for Measuring Sediment Toxicity of Hydrophobic Contaminants. Environ. Sci. Technol., 41 (24), 8394-8399.

Yang, W.C., W. Hunter, F. Spurlock,and J. Gan. 2007. Bioavailability of Permethrin and Cyfluthrin in Surface Waters with Low Levels of Dissolved Organic Matter. J. Environ. Qual. 36: 1678-1685.

Bondarenko, S., F. Spurlock, and J. Gan. 2007. Analysis of Pyrethroids in Sediment Pore Water by Solid-Phase Microextraction. J. Environ. Qual. 26: 2587-2593.

Yang, W., Frank Spurlock, Weiping Liu, and Jianying Gan. 2006. Inhibition of Aquatic Toxicity of Pyrethroid Insecticides by Suspended Sediment. J. Environ. Tox. Chem. 25(7) 1913-1919.

Yang, W., Frank Spurlock, Weiping Liu, and Jianying Gan. 2006. Effects of Dissolved Organic Matter on Permethrin Bioavailability to Daphnia Species. J. Agric. Food Chem., 54(11) 3967-3972.

Yang, W., Jianying Gan, Wesley Hunter, and Frank Spurlock. 2006. Effect of Suspended Solids on Bioavailability of Pyrethroid Insecticides. Environ. Toxicol. Chem. 25(6): 1585-1591.

SWC 02-04 Development of Bioassessment Reference Sites in the San Joaquin Valley

In collaboration with the Central Valley Regional Water Quality Control Board, the Department of Fish and Game (DFG), and other government and private agencies, the Department of Pesticide Regulation (DPR) will establish bioassessment reference sites for the San Joaquin Valley. A quantitative method will be established for selecting thirty reference sites within this low-gradient (< 2% slope), anthropogenic-impacted region. Bidwell Environmental Institute (BEI), in association with the California State University, Chico will conduct taxonomy analysis of benthic macroinvertebrates for DPR. Jim Harrington of BEI and DFG will provide technical guidance and a final report to DPR. The final report will include recommendations for the use of bioassessment as a monitoring tool for DPR. Contract period: April 2002 - June 2004.

Harrington, J., California Department of Fish and Game, Water Pollution Control Laboratory and the Chico State Research Foundation. June 2004. Developing a Biological and Physical Habitat Assessment Program for the Department of Pesticide Regulation, PDF (27 kb).

Contract Manager: Nina Bacey

SWC 02-03 Aerial Deposition of Selected Pesticides in Southern California

SCCWRP will determine the impact of atmospheric deposition of pesticides transported from sources within the airshed to waterbodies of interest in selected regions of Southern California. The investigation will likely cover portions of RWQCB Regions 4, 7, 8, and 9. Contract period: April 2002 - June 2003.

SWC 02-02 Bay Area/Sacramento Urban Pesticide Use Surveys

The University of California, Integrated Pest Management (UC IPM) will conduct surveys of urban pesticide use in the San Francisco Bay Area and Sacramento to help develop a better understanding of urban use patterns. There is no sales survey associated with this study. Contract period: April 1, 2002 - November 1, 2002.

Final Report, PDF (657 kb):

Flint, M. 2003. Residential Pesticide Use in California: A Report of Surveys Taken in the Sacramento (Arcade Creek), Stockton (Five-Mile Slough) and San Francisco Bay Areas with Comparisons to the San Diego Creek Watershed or Orange County, California.

SWC 02-01 California Central Coast Watersheds Study

The Watershed Institute and the Foundation of California State University Monterey Bay (CSUMB) will measure the concentrations of chlorpyrifos and diazinon in the water column and in sediments at 9 sites over a 2-year period. Monitoring will be conducted both during the non-winter irrigation season, and during winter storm events. The monitoring will clarify the linkage between urban and agricultural sources of chlorpyrifos and diazinon and their fate in receiving waters. Contract period: Spring 2002 - Spring 2004.

SWC 01-08 Diazinon/Chlorpyrifos Runoff Potential Assessment

On behalf of the San Francisco Estuary Project, TDC Environmental conducted an analysis of the relative potential for release of various diazinon and chlorpyrifos products into surface water. The California Department of Pesticide Regulation funded this analysis. The information developed from this project is intended to help DPR, the California State and Regional Water Quality Control Boards, and other interested parties identify potentially problematic sites of use and formulations of diazinon and chlorpyrifos in the urban setting.

Final Report, PDF (807 kb).:

TDC Environmental, 2001. Diazinon and Chlorpyrifos Products: Screening for Water Quality Implications

SWC 01-07 Database Review

Statistical Approaches, UC Davis will develop statistical methodology when applied to the surface water database, will lead to confidence statements for pesticide levels and toxicity and lead to realistic estimates for probabilities of exceeding critical values established by various regulatory agencies.

Final Report, PDF (1.9 mb):

Shumway, Robert H., 2001. Statistical Approaches to Assessing Pesticide Concentrations in the DPR Surface Water Database.

SWC 01-06 Assessment of Copper Contribution from Antifouling Bottom Paints and Underwater Hull Cleaning

The Southern California Coastal Water Research Project (SCCWRP) will assess leaching rate from various copper antifouling paints and mass loading from underwater hull cleaning activities under controlled conditions. Contract period: September 1, 2001 - June 30, 2003.

Final Report, PDF (370 kb)

Schiff, K., D. Diehl, and A. Valkirs. 2003. Copper emissions from antifouling paint on recreational vessels. SCCWRP Technical Report 405.

SWC 01-05 Runoff Potential of Multiple Active Ingredients

The California State University's Center for Irrigation Technology is comparing the runoff potential of several pesticide active ingredients. They are responsible for the design and preparation of plots (bare ground), pesticide application, water application, and sample collection. Contract period: August 2001 through June 2002. Project Canceled.

SWC 01-04 Irrigation-Season Organophosphate Monitoring in the San Joaquin River Basin

The USGS will assess the extent to which current farming and urban practices, with respect to pesticide usage, contribute to the contamination of surface waters in the Lower San Joaquin River during summer months. The monitoring program includes weekly sampling at 12 major mainstem and tributary sites. Contract period: April 1, 2001 - June 30, 2002.

Domalgalski, J.L. and C. Munday, U.S. Geological Survey. 2003. Evaluation of Diazinon and Chlorpyrifos Concentrations and Loads, and Other Pesticide Concentrations, at Selected Sites in the San Joaquin Valley, California, April to August, 2001, PDF (6.4 mb).

SWC 01-03 Urban Land-use Rain Runoff Study

The Southern California Coastal Water Research Project collected and analyzed storm runoff samples associated with various urban land use types. The pesticides of focus are diazinon and chlorpyrifos. Results will help in the allocation of urban pesticide runoff based on land use. Contract period: January 2001 - June 2001.

Final Report, PDF (2.7 mb):

Schiff, K. and M. Sutula, 2001. Southern California Coastal Water Research Project, Organophosphorous Pesticides in Stormwater Runoff from Southern California.

SWC 01-02 Upper Sacramento River Watershed Monitoring

The California State University, Chico conducted monitoring for diazinon at seven sites in the Upper Sacramento River watershed. Results will augment diazinon data from the monitoring study in the Sacramento/Feather River watershed. Contract period: January 2001 - June 2001.

SWC 01-01 Lower San Joaquin Valley Dormant Spray Organophosphate Monitoring Continuation

Monitoring by USGS continues for fiscal year 2000. Contract period: January 2001 - December 2001 (winter season).

Final Report, PDF (5 kb):

Zamora, C. , C. R. Kratzer, M. S. Majewski, and D. L. Knifong. U.S. Geological Survey. 2003. Diazinon and Chlorpyrifos Loads in Precipitation and Urban and Agricultural Storm Runoff during January and February 2001 in the San Joaquin River Basin, California. Cover, PDF (16 mb).

SWC 00-07 Sacramento/Feather River Diazinon Monitoring Continuation

Monitoring by USGS continues for the fiscal year 2000. Contract period: December 2000 - December 2001 (2000-01 winter runoff season).

SWC 00-06 Residential Irrigation and Rain Runoff Study

The Irvine Ranch Water District will gather data on urban pesticides in irrigation and storm water runoff from three residential neighborhoods. This multi-year study will provide baseline organophosphate residential runoff data during both dry and wet-weather periods. The study will also attempt to measure the effectiveness of runoff management practices on the test neighborhoods. Management practices will be applied by a parallel but independent study which aims to reduce residential runoff and improve runoff quality by using irrigation control devices and by promoting more efficient garden chemical usage. Contract period: December 2000 - June 2003.

Final Report, PDF (2.5 mb)

Schiff, K.C. and L.T. Tiefenthaler. 2003. Contributions of organophosphorus pesticides from residential land uses during dry and wet weather. SCCWRP Report 406.

SWC 00-05 Diazinon ELISA Evaluation

The University of California, Davis, evaluated interferences in storm water runoff on the diazinon enzyme-linked immunosorbent assay (ELISA). They also evaluated methods to mitigate the presence of potential interferences to improve ELISA selectivity, such as clean-up or extraction procedure modifications. To test these modifications, they analyzed storm water runoff samples using ELISA and compared their results with gas chromatographic analysis performed by the California Department of Food and Agriculture's Center for Analytical Chemistry. Contract period: November 2000 through June 2001.

SWC 00-04 Urban Pesticide Sales and Use Surveys

The University of California, Statewide Integrated Pest Management Project (UC IPM) gathered urban pesticide sales and use data to help develop a better understanding of urban demand/usage and residential use patterns in the urban setting. The initial area of study is the Newport Bay/San Diego Creek watershed. An expansion of the surveys is taking place in the Santa Ana/New Delhi Channel watershed (Orange Co.) and the Chollas Creek watershed (San Diego Co.) Contract period: May 2000 - December 2001.

Final Report:

Wilen, C., University of California Statewide IPM Project, UC Cooperative Extension, 2001. Survey of Residential Pesticide Use and Sales in the San Diego Creek Watershed of Orange County, California, PDF (1.9 mb).

Survey: September 2002. Wilen, C., UCIPM. Survey of Residential Pesticide Use in the Chollas Creek Area of San Diego County and Delhi Channel of Orange County, California, PDF (721 kb).

SWC 00-03 Diazinon Urban Runoff Study

The County of Alameda is evaluating runoff potential of diazinon from paved surfaces. The county will design and construct concrete test plots, equipment will be installed and calibrated to measure flow volume, temperature, wind speed, and other meteorological conditions. Contract period May 2000 - September 2001.

Final Report, PDF (2.6 mb):

Feng, A. and J. Scanlin, Prepared for the Alameda County Flood Control and Water Conservation District, 2001.Runoff of diazinon from paved plots and test sites: Summary of results.

SWC 00-02 Chollas Creek Watershed Diazinon/Chlorpyrifos Monitoring

This monitoring study extends the existing monitoring plan that the San Diego Regional Board established. Analysis involves chemical methods for diazinon and chlorpyrifos as well as freshwater bioassays for toxicity on the samples. Collected data will help aid the understanding of organophosphate loading in urban Chollas Creek and the development of the Chollas Creek diazinon TMDL. Contract period May 2000 - June 2002.

Final Report, PDF (4.5 mb):

MEC Analytical Systems, Inc. 2002. 1999-2001 Chollas Creek Watershed Monitoring.

SWC 00-01 Controlled Diazinon Runoff Study

California State University, Fresno's Center for Irrigation Technology performed diazinon runoff studies under simulated rainfall/irrigation conditions and differing environmental conditions. Initial studies focused on turf and other bare soil and vegetated surfaces. Variables included slope, rainfall/irrigation intensity, and diazinon formulation. These studies will provide critical information in determining relative contributions of various diazinon formulations in typical residential applications. Contract period April 2000 - June 2001.

EH 02-02, PDF (632 kb). Spurlock, F., C. Garretson, G. Jorgenson, E. Norum, H. Gonsalves, H. Feng, J. Hernandez, and J. Hsu. 2002. Runoff of diazinon from turf: Effect of water application, slope, and formulation.

SWC 99-02 Sacramento/Feather River Diazinon Monitoring

The USGS jointly conducted a monitoring study with DPR to quantify the individual contributions of tributaries to the loading of diazinon to the Sacramento and Feather Rivers during peak flow events in the dormant-spray season. USGS will write the final report for the Feather River watershed diazinon loading study, incorporating data collected by DPR and UCD. Contract period: December 1999 - December 2000.

Final Report, PDF (2 mb):

Dileanis, P.B., Bennett, K. B., Domalgalski, J.L., U.S. Geological Survey. CDPR. Occurrence and Transport of Diazinon in the Sacramento River, California, and Selected Tributaries During Three Winter Storms, January - February, 2000.

SWC 99-01 Lower San Joaquin Valley Basin-Dormant Spray Organophosphate Monitoring

The United States Geological Survey (USGS) monitored organophosphate pesticides in the lower San Joaquin River Basin during the dormant spray season in January and February 2000. The monitoring plan was developed in cooperation with the Central Valley RWQCB. The weekly sampling will put the storm transport in context with overall transport during the dormant spray application period. Contract period: December 1999 - September 2000.

Final Report, PDF (1.4 mb):

Kratzer, C.R., Zamora, C., Knifong, D.L., U.S. Geological Survey. 2002. Diazinon and Chlorpyrifos Loads in the San Joaquin River Basin, California, January and February, 2000.

SWC 96-01 Atmospheric Transport of Pesticides in the Sacramento, California Metropolitan Area, 1996-1997

The USGS will finalize its monitoring study on atmospheric transport of pesticides. Air samples were collected in one urban and two agricultural locations in Sacramento County, California. The samples were analyzed for a variety of current use pesticides including dormant orchard spray insecticides, rice herbicides, and urban use pesticides.

Final Report, PDF (2.5 mb):

Majewski, M.S. and D.S. Baston, U.S. Geological Survey. 2002. Atmospheric Transport of Pesticides in the Sacramento, California Metropolitan Area, 1996-1997.