The City of Bloomington Utilities introduced more ammonia than usual in the city’s water supply Monday night, resulting in complaints around the city of odorous water.
The release of the chemical at the Monroe Water Treatment Plant was unintentional, says utilities spokesman John Callihan.
“The amount of additional ammonia did not exceed regulatory guidelines and water continues to be safe,” he says.
A combination of chlorine and ammonia is routinely used to treat Bloomington’s drinking water.
He says utilities personnel have yet to pinpoint where the error occurred.
“We won’t know for sure until we do a complete analysis, but it appears it may have been a calibration glitch. But we won’t know that for sure until a complete analysis is done,” he says.
The smell of the excess ammonia should be gone within a few days as the ammonia dissipates through the system, Callihan says.