Water supply safe?

Lewisburg city officials are confident that their water supply is safe. The water system was tested recently, and it showed that it did test positive for the chemical Chromium 6. What does that mean though? The EPA says the maximum contamination level for Chromium is 100 parts per billion. The highest test result in the Lewisburg Water System is 0.079 parts per billion, and that is above the minimum detection level of 0.03 parts per billion.