Appendix 1-10: Summary of Diazinon Monitoring Data



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  1. Surface Water




    1. USGS NAWQA Surface Water Data (1992 – 2014)

Surface water data from the USGS NAWQA program were obtained on December 30, 2014 (USGS, 2015). A total of 30,297 water samples across 2,206 sites throughout the United States were analyzed for diazinon between 1993 and 2014. There were 8,313 detections (27% of samples) of diazinon in the United States and concentrations ranged from not detectable to 3.8 µg/L. Forty-six states had detections of diazinon in surface water. After 2004, the highest detected concentration was 0.359 µg/L. The long term method detection level is 0.003 µg/L (Gilliom et al., 2007). As expected, higher numbers of samples collected within a given state tended to correspond with higher maximum concentrations detected (Figure B 1-10.1). Eleven states5 had detections at 0.9 µg/L or greater and 34 states had detections above 0.1 µg/L (Table B 1-10.4). Detections above 0.1 µg/L occurred in creeks and storm drains, as well as in major rivers.


Figure B 1-10.1. Number of surface water samples analyzed for diazinon in each state and the maximum diazinon concentration in surface water detected in that state


Table B 1-10.1. Summary of NAWQA monitoring results for diazinon by state

State/Tribal Area

Detections

Samples

Frequency

Maximum Diazinon Concentration Detected (µg/L)

Sample Years

Alabama

197

881

22%

1.01

1998-2008

Alaska

5

47

11%

0.0427

1999

Arizona

95

265

36%

0.207

1996-2010

Arkansas

55

404

14%

0.0328

1994-2010

California

1602

2442

66%

3.8

1992-2012

Colorado

298

848

35%

0.66

1993-2010

Connecticut

116

406

29%

0.21

1993-2010

Delaware

1

5

20%

0.007

1999

District of Columbia

6

6

100%

0.21

1994 & 2000

Florida

116

618

19%

0.276

1993-2005

Georgia

441

1696

26%

2.8

1993-2010

Hawaii

23

57

40%

0.293

1999-2001

Idaho

17

485

4%

0.093

1994-2004

Illinois

434

1421

31%

0.224

1996-2009

Indiana

669

1801

37%

1.1

1991-2010

Iowa

28

1169

2%

0.095

1996-2011

Kentucky

11

151

7%

0.0067

1997-2008

Louisiana

347

1664

21%

0.978

1995-2009

Maine

0

4

0%

Not detected

2000

Maryland

50

393

13%

0.1

1994-2004

Massachusetts

117

293

40%

0.4

1994-2011

Michigan

68

227

30%

0.197

1996-2006

Minnesota

121

655

18%

0.19

1996-2010

Mississippi

29

513

6%

0.025

1996-2007

Missouri

49

383

13%

0.114

1994-2005

Montana

1

224

0%

0.003

2000

Nebraska

123

927

13%

0.184

1992-2009

Nevada

190

465

41%

0.46

1993-2008

New Hampshire

5

32

16%

0.006

1994 & 2000

New Jersey

216

704

31%

0.47

1996-2009

New Mexico

28

122

23%

0.21

1993-1996

New York

135

663

20%

0.697

1994-2007

North Carolina

246

973

25%

0.315

1992-2009

North Dakota

1

162

1%

0.004

1995

Ohio

336

842

40%

0.564

1996-2008

Oklahoma

2

13

15%

0.017

1994-1995

Oregon

320

1053

30%

1.28

1992-2011

Pennsylvania

235

1095

21%

0.436

1993-2010

Rhode Island

0

1

0%

Not Detected

1999

South Carolina

94

526

18%

0.323

1996-2005

Tennessee

97

537

18%

1.05

1996-2004

Texas

661

1547

43%

1.2

1993-2013

Utah

166

354

47%

1.22

1999-2010

Vermont

0

9

0%

Not detected

1994-1995

Virginia

213

886

24%

1.4

1993-2010

Washington

210

1487

14%

0.501

1993-2012

West Virginia

4

84

5%

0.338

1994 & 1996

Wisconsin

148

673

22%

0.98

1993-2011

Wyoming

2

84

2%

0.0474

2003

United States

8328

30297




27%




30297

27%

3.80

1993-2014

A total of 1,499 surface water samples across sites throughout the United States were analyzed for diazoxon between 2002 and 2014. Detections occurred in 2004 in California and Texas. Concentrations ranged from not detected to 0.06 µg/L with the highest detection occurring in 2004. The limit of quantitation ranged from 0.006 to 0.045 µg/L based on the range of less than values reported in the dataset. Diazinon and diazoxon were analyzed in these samples and the ratio of the concentration of the oxon to the diazinon concentration ranged from 0.11 to 0.25.




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