A review of diazinon use, contamination in surface waters, and regulatory actions in California across water years 1992–2014

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Abstract

Diazinon is an organophosphorus insecticide that has been widely used in the USA and in California resulting in contamination of surface waters. Several federal and state regulations have been implemented with the aim of reducing its impact to human health and the environment, e.g., the cancellation of residential use products by the USEPA and dormant spray regulations by the California Department of Pesticide Regulation. This study reviewed the change in diazinon use and surface water contamination in accordance with the regulatory actions implemented in California over water years 1992–2014. We observed that use amounts began declining when agencies announced the intention to regulate certain use patterns and continued to decline after the implementation of those programs and regulations. The reduction in use amounts led to a downward trend in concentration data and exceedance frequencies in surface waters. Moreover, we concluded that diazinon concentrations in California’s surface waters in recent years (i.e., water years 20122014) posed a de minimis risk to aquatic organisms.

Keywords

Diazinon Regulatory actions Surface waters Risk assessment 

Supplementary material

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Copyright information

© Springer International Publishing Switzerland 2017

Authors and Affiliations

  1. 1.California Department of Pesticide RegulationSacramentoSacramentoUSA

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