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Open-File Report 2007–1118

Prepared in cooperation with the Sisseton-Wahpeton Oyate

Pesticide Concentrations in Wetlands on the Lake Traverse Reservation, South and North Dakota, July 2006

By Kathleen M. Neitzert and Roy C. Bartholomay

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Open-File Report
2007-1118 PDF (667 kB)
Abstract

During July 2006, water samples were collected from selected Lake Traverse wetlands within the historic Reservation boundary in northeastern South Dakota and southeastern North Dakota as part of a reconnaissance-level assessment by the U.S. Geological Survey (USGS) and Sisseton-Wahpeton Oyate (SWO). Eighteen wetlands were sampled by the SWO and USGS personnel after primary pesticide application occurred on the Lake Traverse Reservation. Samples were analyzed for 61 pesticide compounds. In addition, the samples were analyzed for physical properties that might help further characterize the water quality of the wetlands.

During July 2006, water samples were collected from 18 wetlands and were analyzed for 61 widely used pesticide compounds. Pesticides were detected in 17 of the 18 sampled wetlands. In the 17 wetlands in which pesticides were detected, the number of pesticides detected ranged from two to eight. Of the 61 pesticides for which the samples were analyzed, 51 pesticides were not detected in any of the wetland samples. Ten pesticides were detected in water samples from at least one of the wetlands at small concentrations. Atrazine and de-ethyl atrazine were detected in samples from 17 of the 18 wetlands. The minimum, maximum, and median concentrations of dissolved atrazine detected were 0.007, 0.12, and 0.064 microgram per liter (µg/L), respectively. Two pesticides (picloram and simazine) were detected in only one wetland each. None of the pesticide concentrations exceeded any U.S. Environmental Protection Agency Maximum Contaminant Levels for drinking water, and concentrations were much less than levels considered toxic for humans or aquatic species.

Version 1.0

Posted February 2008


Suggested citation:

Neitzert, K.M., and Bartholomay, R.C., 2007, Pesticide concentrations in wetlands on the Lake Traverse Reservation, South and North Dakota, July 2006: U.S. Geological Survey Open-File Report 2007–1118, 25 p.



Contents

Abstract

Introduction

Purpose and Scope

Description of Study Area

Previous Investigations

Methods of Investigation

Site Selection

Sample Collection

Analytical Methods

Reporting Levels

Quality Assurance and Quality Control

Field Equipment Blank Sample

Field Replicate Sample

Pesticide Concentrations in Wetlands

Physical Properties

Pesticides

Synopsis of Pesticide Results

Atrazine

2,4–D

Glyphosate

Metolachlor

Prometon

Acetochlor

Picloram

Summary

References Cited

Supplemental Information

U.S. Fish and Wildlife Service Wetlands Inventory Codes and Definitions



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Last modified: Wednesday, 07-Dec-2016 20:15:41 EST