Little Thompson Water District: Excess levels of trihalomethanes and haloacetic acids

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From the Berthoud Recorder (Sandy Barnes):

April samples taken at seven locations throughout the district also showed levels of chemical compounds higher than the maximum contaminants the EPA has set for stage two monitoring of drinking water. Hibbard explained that water is being assessed on the basis of EPA standards that go into effect in 2013. “In reality, we’re not out of compliance,” he said. Stage two monitoring requires measurements in parts per billion of disinfection byproducts resulting from the use of chlorine, which include trihalomethanes and haloacetic acids, according to information on the EPA’s Web site. Mike Cook, district engineer for the Little Thompson Water District, said the stage one sample, which allows an average calculation of samples taken at various sites, is the critical one for the present time. Stage two monitoring is site specific, requiring the reporting of measurements at each location. Cook also said that water sampling results can vary by as much as 25 percent at different labs used for the analysis. Adding to the challenge of complying with EPA standards is that the state requires water disinfection with chlorine, said Hibbard. In order to address the problem, it would be necessary to work with staff at the Carter Lake filter plant where the water is treated and with Weld County, he noted.

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