Tests performed on samples taken from water near the Sandvik Materials Technology plant on January 27th revealed a presence of cyanide 20 times above recommended levels.
But the company did its best to assure employees who had consumed water in recent weeks that there was nevertheless a low risk of poisoning.
“We've been in contact with the poison information centre and they say that there isn't a high risk for poisoning at these levels,” said Sandvik Materials Technology spokesperson Lena Berg to the Gefle Dagbladet newspaper.
She added that the company isn't sure if the test was a one-time occurrence or if cyanide levels in the water remain high.
As of Monday night, there was still no information as to what may have caused the high cyanide readings.