USGS Scientific Investigations Report 2011-5082 - Occurrence and Distribution of Pesticides in Surface Waters of the Hood River Basin, Oregon, 1999

Table 8. Percentage of samples from the Hood River basin, Oregon, exceeding U.S. Environmental Protection Agency or Oregon freshwater aquatic life standards for pesticides analyzed only in 2009.

[Sample size includes screened samples, not total samples. All concentrations reported in micrograms per liter; Abbreviations: USEPA, U.S. Environmental Protection Agency; CMC, criteria maximum concentration; CCC, criterion continuous concentration; %, percent; –, no water-quality standard; >, greater than]

		USEPA Office of Pesticide Programs Aquatic Life Benchmarks				USEPA Water Quality Criteria		Oregon Water Quality Criteria		Percentage exceeding lowest standard (%)
		Fish		Invertebrates		USEPA Water Quality Criteria		Oregon Water Quality Criteria
		Acute	Chronic	Acute	Chronic	CMC (Acute)	CCC (Chronic)	Acute	Chronic
Propiconazole		425	95	2,400	–	–	–	–	–	0
Pyraclostrobin		–	–	–	–	–	–	–	–	–
Diuron		355	26	80	160	–	–	–	–	0
Fluometuron		320	–	110	–	–	–	–	–	0
Hexazinone		137,000	17,000	75,800	20,000	–	–	–	–	0
Norflurazon		4,050	770	> 750	1,000	–	–	–	–	0
Carbaryl		110	6.8	0.85	0.5	–	–	–	–	0
DEET		–	–	–	–	–	–	–	–	–
Endrin		–	–	–	–	0.086	0.036	0.18	0.0023	0.9
Site where   detected	Rogers	7
Imidacloprid		> 41,500	1,200	35	1.05	–	–	–	–	0
Methomyl		160	12	2.5	0.7	–	–	–	–	0
Propoxur		1,850	–	5.5	–	–	–	–	–	0

Occurrence and Distribution of Pesticides in Surface Waters of the Hood River Basin, Oregon, 1999–2009