Supervisory Hydrologist, U.S. Geological Survey, 2800 Cottage Way, Sacramento, California 95825.
PESTICIDES AND PESTICIDE DEGRADATION PRODUCTS IN STORMWATER RUNOFF: SACRAMENTO RWER BASIN, CALIFORNIA1
Version of Record online: 8 JUN 2007
JAWRA Journal of the American Water Resources Association
Volume 32, Issue 5, pages 953–964, October 1996
How to Cite
Domagalski, J. (1996), PESTICIDES AND PESTICIDE DEGRADATION PRODUCTS IN STORMWATER RUNOFF: SACRAMENTO RWER BASIN, CALIFORNIA. JAWRA Journal of the American Water Resources Association, 32: 953–964. doi: 10.1111/j.1752-1688.1996.tb04065.x
Paper No. 95165 of the Water Resources Bulletin. Discussions are open until April 1, 1997.
- Issue online: 8 JUN 2007
- Version of Record online: 8 JUN 2007
- agricultural hydrology;
- aquatic toxicology;
- nonpoint source pollution;
- water quality;
- stormwater management
ABSTRACT: Pesticides in stormwater runoff, within the Sacramento River Basin, California, were assessed during a storm that occurred in January 1994. Two organophosphate insecticides (diazinon and methidathion), two carbamate pesticides (molinate and carbofuran), and one triazine herbicide (simazine) were detected. Organophosphate pesticide concentrations increased with the rising stage of the hydrographs; peak concentrations were measured near peak discharge. Diazinon oxon, a toxic degradation product of diazinon, made up approximately 1 to 3 percent of the diazinon load. The Feather River was the principal source of organophosphate pesticides to the Sacramento River during this storm. The concentrations of molinate and carbofuran, pesticides applied to rice fields during May and June, were relatively constant during and after the storm. Their presence in surface water was attributed to the flooding and subsequent drainage, as a management practice to degrade rice stubble prior to the next planting. A photo-degradation product of molinate, 4-keto molinate, was in all samples where molinate was detected and made up approximately 50 percent of the total molinate load. Simazine, a herbicide used in orchards and to control weeds along the roadways, was detected in the storm runoff, but it was not possible to differentiate the two sources of that pesticide to the Sacramento River.