USGS WRIR 98-4222: Table 9

Pesticides in Streams of the United States--Initial Results from the National Water-Quality Assessment Program

By Steven J. Larson, Robert J. Gilliom, and Paul D. Capel

U.S. GEOLOGICAL SURVEY
Water-Resources Investigations Report 98-4222
Sacramento, California, 1999

Table 9. Estimated mean concentrations of selected compounds for a 1-year period.

[Mean values exceeding human-health criteria are printed in blue. Crop group codes are defined in table 4. MCL, U.S. Environmental Protection Agency established maximum contaminant level for drinking water; HAL, U.S. Environmental Protection Agency established health advisory level for drinking water; mg/L, micrograms per liter; –, no crop group classification assigned]

Site code	Crop group code	Year	Estimated mean concentration for a 1-year period
			Alachlor (MCL, 2 mg/L)	Atrazine (MCL, 3 mg/L)	Cyanazine (HAL, 1 mg/L)	Diazinon (HAL, 0.6 mg/L)	Simazine (MCL, 4 mg/L)
AGRICULTURAL INDICATOR SITES
lsus-mill	C	1993	0.01	0.13	0.00	0.00	0.20
cnbr-prairie	C	1993	0.25	2.33	0.06	0.00	0.08
wmic-duck	C	1993	0.07	0.39	0.16	0.00	0.03
hdsn-canaj	CA	1994	0.00	0.17	0.02	0.00	0.00
poto-muddy	CA	1993	0.01	0.32	0.02	0.00	0.08
wmic-nbmilw	CAv	1993	0.01	0.05	0.04	0.00	0.07
cnbr-maple	CS	1993	0.19	1.12	3.04	0.00	0.01
cnbr-shell	CS	1993	0.26	1.31	0.89	0.00	0.01
whit-kess	CS	1993	0.23	3.83	4.13	0.00	0.05
whit-sugar	CS	1993	0.07	0.72	0.04	0.01	0.03
albe-pete	CScot	1993	0.07	0.05	0.00	0.00	0.00
albe-albe	CSW	1993	0.07	0.07	0.00	0.00	0.00
lsus-eastm	CW	1993	0.02	0.15	0.10	0.00	0.04
poto-mono	CW	1994	0.05	0.59	0.07	0.00	0.19
splt-lone	CW	1993	0.18	0.22	0.33	0.01	0.01
acfb-lime	CWp	1993	0.00	0.01	0.01	0.00	0.01
trin-chamb	CWsor	1994	0.02	1.48	0.00	0.01	0.03
ccpt-crab.rl	WA	1993	0.00	0.02	0.00	0.00	0.01
usnk-rock	WAb	1993	0.00	0.01	0.00	0.00	0.00
ccpt-palouse	Wb	1993	0.00	0.03	0.00	0.00	0.01
redn-turtle	Wb	1993	0.00	0.01	0.00	0.00	0.00
usnk-teton	Wpot	1993	0.00	0.00	0.00	0.00	0.00
gafl-tucsa	WScot	1993	0.00	0.00	0.00	0.00	0.00
albe-devils	WStob	1993	0.02	0.02	0.00	0.00	0.01
ccpt-crab.m	W	1993	0.00	0.01	0.00	0.00	0.01
ccpt-el68	W	1993	0.03	0.01	0.00	0.00	0.00
redn-snake	W	1993	0.00	0.01	0.00	0.00	0.00
redn-wildr	W	1993	0.00	0.03	0.01	0.00	0.00
gafl-little	P	1993	0.02	0.01	0.00	0.00	0.00
acfb-aycocks	P	1993	0.00	0.01	0.00	0.00	0.00
sanj-salt	COTv	1993	0.00	0.01	0.13	0.05	0.03
will-pudding	FGv	1994	0.01	0.11	0.00	0.00	0.06
will-zollner	FGv	1993	0.01	0.64	0.00	0.07	0.37
sanj-merced	O	1993	0.00	0.00	0.00	0.04	0.07
sanj-orest	O	1993	0.02	0.01	0.00	0.05	0.04
ozrk-dous	XX	1994	0.00	0.00	0.00	0.00	0.00
ozrk-yocum	XX	1994	0.00	0.01	0.00	0.00	0.00

Table 9. Estimated mean concentgrations of selected compounds for a one year period–Continued

Site code	Crop group code	Year	Estimated mean concentration over a one-year period
			Alachlor (MCL, 2 mg/L)	Atrazine (MCL, 3 mg/L)	Cyanazine (HAL, 1 mg/L)	Diazinon (HAL, 0.6 mg/L)	Simazine (MCL, 4 mg/L)
URBAN INDICATOR SITES
conn-norwalk	--	1993	0.00	0.01	0.00	0.00	0.01
hdsn-lisha	--	1994	0.00	0.00	0.00	0.02	0.00
lsus-cedar	--	1993	0.01	0.14	0.01	0.00	0.03
poto-acco	--	1994	0.00	0.01	0.00	0.15	0.31
gafl-lafayette	--	1993	0.00	0.06	0.00	0.05	0.03
acfb-sope	--	1994	0.00	0.04	0.00	0.03	0.32
whit-little	--	1993	0.10	0.43	0.02	0.06	0.04
splt-cherry	--	1993	0.00	0.03	0.00	0.04	0.03
trin-rush	--	1993	0.00	0.18	0.00	0.58	0.17
nvbr-lasvegas	--	1994	0.00	0.01	0.00	0.08	0.18
will-fanno	--	1993	0.00	0.02	0.00	0.03	0.06

INTEGRATOR SITES
hdsn-moh	CA	1994	0.00	0.05	0.01	0.00	0.00
poto-shenan	CA	1993	0.00	0.12	0.01	0.00	0.05
albe-tar	CScot	1993	0.01	0.03	0.00	0.01	0.04
gafl-withla	P	1993	0.00	0.03	0.00	0.00	0.01
whit-white	CS	1993	0.14	1.29	0.37	0.01	0.09
wmic-milw	CAv	1993	0.03	0.10	0.08	0.00	0.04
redn-rr.fargo	CSW	1994	0.00	0.09	0.06	0.00	0.01
redn-rr.em	W	1993	0.01	0.07	0.03	0.00	0.00
cnbr-platte	CW	1993	0.09	0.93	0.29	0.00	0.01
sanj-sanj	O	1993	0.00	0.00	0.02	0.06	0.08

Pesticide National Synthesis Project

Pesticides in Streams of the United States--Initial Results from the National Water-Quality Assessment Program