Estimation of upper centile concentrations using historical atrazine monitoring data from community water systems

Journal of Environmental Quality
Paul MosquinWenlin Chen

Abstract

A survey sampling approach is presented for estimating upper centiles of aggregate distributions of surface water pesticide measurements obtained from datasets with large sample sizes but variable sampling frequency. It is applied to three atrazine monitoring programs of Community Water Systems (CWS) that used surface water as their drinking water source: the nationwide Safe Drinking Water Act (SDWA) data, the Syngenta Voluntary Monitoring Program (VMP), and the Atrazine Monitoring Program (AMP).The VMP/AMP CWS were selected on the basis of atrazine monitoring history (CWS having at least one annual average concentration from SDWA ≥ 1.6 ppb atrazine since 1997 in the AMP). Estimates of the raw water 95th, 99th, and 99.9th centile atrazine concentrations for the VMP/AMP CWS are 4.82, 11.85, and 34.00 ppb, respectively. The corresponding estimates are lower for the finished drinking water samples, with estimates of 2.75, 7.94, and 22.66 ppb, respectively. Finished water centile estimates for the VMP/AMP CWS using only the SDWA data for these sites are consistent with the results. Estimates are provided for the April through July period and for CWS based on surface water source type (static, flowing, or mixed). Requisite sample si...Continue Reading

Citations

Nov 14, 2013·Journal of Agricultural and Food Chemistry·Roy W Whitmore, Wenlin Chen
Jun 19, 2013·Neurotoxicology and Teratology·Zhoumeng LinNikolay M Filipov
Dec 17, 2014·Water Research·Paul L MosquinNicholas N Poletika
Aug 6, 2014·Integrated Environmental Assessment and Management·Richard A BrainDwayne Rj Moore
Dec 14, 2016·Oxidative Medicine and Cellular Longevity·Shuying GaoYang Zhang
Sep 20, 2020·Integrated Environmental Assessment and Management·David A DreierRichard A Brain
Jul 6, 2021·Journal of Toxicology and Environmental Health. Part B, Critical Reviews·Philip N SmithKeith R Solomon

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