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Water supply implications of herbicide sampling: Hydrologic conditions may affect concentrations of organonitrogen herbicides and may be important considerations in complying with drinking water regulations

Journal - American Water Works Association

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Abstract

The temporal distribution of the herbicides alachlor, atrazine, cyanazine, and metolachlor was documented from September 1991 through August 1992 in the Platte River at Louisville, Neb., the drainage of the Central Nebraska Basins. Lincoln, Ornaha, and other municipalities withdraw groundwater for public supplies from the adjacent alluvium, which is hydraulically connected to the Platte River. Data were collected, in part, to provide information to managers, planners, and public utilities on the likelihood of water supplies being adversely affected by these herbicides. Three computational procedures - monthly means, monthly subsampling, and quarterly subsampling - were used to calculate annual mean herbicide concentrations. When the sampling was conducted quarterly rather than monthly, alachlor and atrazine concentrations were more likely to exceed their respective maximum contaminant levels (MCLs) of 2.0 ??g/L and 3.0 ??g/L, and cyanazine concentrations were more likely to exceed the health advisory level of 1.0 ??g/L. The US Environmental Protection Agency has established a tentative MCL of 1.0 ??g/L for cyanazine; data indicate that cyanazine is likely to exceed this level under most hydrologic conditions.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Water supply implications of herbicide sampling: Hydrologic conditions may affect concentrations of organonitrogen herbicides and may be important considerations in complying with drinking water regulations
Series title:
Journal - American Water Works Association
Volume
88
Issue:
2
Year Published:
1996
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
76
Last page:
85
Number of Pages:
10