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Insecticide Impairment ofUrban Water Bodies:Pesticide regulations are the keyto solving the problemDave TamayoEnvironmental SpecialistSacramento County Stormwater ProgramCalifornia Stormwater Quality AssociationSWRCB Vector Control Permit HearingCalEPA HQ, Sacramento, CAApril 3, 2012
Insecticide impairments limitmosquito control applications.Source: SYMVCD, SWRCB
Pyrethroid toxicity is statewideSurface WaterAmbientMonitoringProgramHolmes, 2008
Cause: structural pesticideapplicationsPhoto: Klotz et al 2008Photo: Alex Wild
Clean Water Act alonewon’t solve these impairments.
Solution:Effective pesticide regulationcan prevent urban WQimpairments
Focus on Nuts and Bolts ofpesticide regulation California Water Quality Agencies Stormwater Agencies (CASQA) POTWs (TriTac) RWQCBs SWRCB US EPA Region 9 US EPA Office of Pesticide Programs Calif. Dept of Pesticide Regulation
DPR Achievements– Surface Water Protection Regulations– Active ingredient screening mechanisms WQ– Pyrethroid re-evaluation– Surface water monitoring program– IPM research and dissemination
US EPAOffice of Pesticide ProgramsAchievements Bifenthrin label changes Pyrethroid registration review frontloaded “Harmonize” CWA/FIFRA WQ effectsanalysis Urban pathway analysis
Pesticide regulations can prevent andsolve water quality problems.2004DiazinonWQOSource: City of San Diego, Chollas Creek TMDL Source Loading, Best Management Practices, andMonitoring Strategy Assessment, prepared by Weston Solutions, September 2006.
Fipronil : the next source of urbanWQ impairment.LC 5018 ppb
Fipronil on the upswing Fipronil, Structural Applications in CaliforniaPounds, Active 1998 1999 2000 2001 2002 2003 2004 2005 2006
Proactivepesticideregulation willget us off thepesticide rollercoaster Fipronil2010sPyrethroids2000sDiazinon1990sActive participation and supportby SWRCB is crucial.
Questions?Dave Tamayo916 874-8024tamayod@saccounty.net
mosquito control applications. Source: SYMVCD, SWRCB . Pyrethroid toxicity is statewide Surface Water Ambient Monitoring Program Holmes, 2008 . . Source: City of San Diego, Chollas Creek TMDL Source Loading, Best Management Practices, and Monitoring Strategy Assessment, prepared by Weston Solutions, September 2006. 2004
