Tests Find Toxic Chemical In Water SuppliesAug 18, 2003 | AP Federal environmental investigators are trying to determine why water in parts of three Iowa towns is contaminated with a toxic chemical found in rocket fuel and some fertilizers.
Perchlorate has been found in water in Hills in eastern Iowa, Napier west of Ames, and Ewart, located in east-central Iowa near Montezuma.
The contaminate can damage the thyroid gland and slow brain development in infants.
Investigators say they have no idea where the perchlorate came from.
Federal workers found such high concentrations in Hills that they are offering bottled water to about 20 families where the contamination has surfaced.