- Associated Press - Tuesday, August 18, 2015

SIOUX CITY, Iowa (AP) - Officials say two former Sioux City employees tampered with samples at the city’s wastewater treatment plant.

Iowa Department of Natural Resources spokesman Kevin Baskins said Monday former plant superintendent Jay Niday and shift supervisor Pat Schwarte treated wastewater with chlorine only on days when samples were tested for E. coli. Baskins said the wastewater, which is released into the Missouri River, could have higher E. coli levels on days when chlorine isn’t added and could pose a risk to those who drink the river water.

Baskins said the employees have been sent a letter telling them the state plans to revoke their wastewater treatment certifications, which the two can appeal.

Schwarte declined to comment to the Sioux City Journal about the letter and the newspaper was not able to reach Niday.

An investigation was launched after a complaint about the wastewater was sent to city officials.

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