National Water-Quality Assessment (NAWQA) Program
U.S. GEOLOGICAL SURVEY
Water-Resources Investigations Report 98-4222
Sacramento, California, 1999
Figure 37. Concentrations of diazinon at five sites. The aquatic-life criterion value of 0.08 microgram per liter established by the International Joint Commission is shown as a horizontal line. Concentrations reported as not detected were assigned a value of zero.