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Predicting Atrazine Levels in Water Utility Intake Water for MCL Compliance

Permanent URL:
http://handle.nal.usda.gov/10113/47206
Abstract:
To protect human health, atrazine concentrations in finished municipal drinking water must not exceed a maximum contaminant level (MCL) of 3 μg/L, as determined by a specific monitoring regime mandated by the United States Environmental Protection Agency. Atrazine levels were monitored along tile-fed drainage ditches draining to a major drinking water source and used to predict MCL exceedance frequencies of intake and finished drinking water. Water samples were collected daily at eight monitoring sites located at the outlets of subbasins draining 298-19341 ha (736-47794 ac). Flow-weighted average (FWA) atrazine concentrations ranged from 0.9 to 9.8 μg/L, and were above 3 μg/L for the majority of sites, including the largest site, which represents water quality at the intake of the local municipal water treatment plant. However, a relatively low percentage of samples near the water utility intake exceeding 3 μg/L atrazine (10.4%) made this problem difficult to detect. In order to have a 95% probability of detecting any intake sample exceeding 3 μg/L atrazine in a drainage system exceeding 3 μg/L atrazine on a FWA basis, sampling frequency would need to be every 7 days or more often during the second quarter when the potentials for field atrazine losses and temporal variability of atrazine concentrations are highest.
Author(s):
Pappas, E.A. , Huang, C.
Subject(s):
atrazine , water pollution , drinking water , water quality standards , drainage systems , water quality , water treatment , sampling , probability analysis , Indiana
Format:
p. 7064-7068.
Note:
Includes references
Source:
Environmental science & technology 2008 Oct. 1, v. 42, no. 19
Language:
English
Year:
2008
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
File:
Download [PDF File]
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.