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| Title | Pesticide Residues in the Skagit Delta Surficial Aquifer - Washington State Pesticide Monitoring Program | |
| Month-Year Published | April 1996 | |
| Online Availability |
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| Short Description |
Twenty-seven wells were sampled near Mt. Vernon, Washington for pesticides and nitrate+nitrite as N. Field measurements of water temperature, pH, and specific conductance were also made. Wells were located in the Skagit Delta Surficial Aquifer underlying the Skagit River delta. (Also see abstract below) | |
| Publication Number | 96-302 | |
| Author(s) | Larson, A. | |
| Print Availability | ||
| Number of pages | 34 pp. | |
| Keywords | aquifer, contaminant, drinking water, Ground Water, health, health advisory, monitoring, nitrate, nitrite, pesticide, Pesticides, pH, river, Skagit , specific conductance, study, temperature, water, wells | |
| Abstract | Long Description |
Twenty-seven wells were sampled near Mt. Vernon, Washington for pesticides and nitrate+nitrite as N. Field measurements of water temperature, pH, and specific conductance were also made. Wells were located in the Skagit Delta Surficial Aquifer underlying the Skagit River delta. Nine pesticides were detected in the initial samples: dacthal (DCPAs), atrazine, prometon, bromacil, 3,5-dichlorobenzoic acid, dicamba, 4-nitrophenol, pentachlorophenol, and total xylenes. However, only atrazine, prometon, and bromacil were confirmed by the verification sampling. Pesticides were detected in 11 of the 27 study wells, with more than one pesticide found in three wells. Concentrations of all pesticides were below the Maximum Contaminant Level (MCL) or Lifetime Health Advisory Level set by the EPA for public drinking water. In two wells, the nitrate+nitrite as N concentration exceeded the 10.0 mg/L drinking water standard for nitrate. Eight wells also had specific conductance values greater than the 700 mmhos/cm MCL for drinking water |
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