On 17 November 2004 MDEQ SOSC Ernie Shirley notified EPA that a mercury release occurred at the Hattiesburg water treatment plant due to a flow detection instrument that failed. The mercury spill originated from a flow meter in the laboratory of the water treatment plant. Mercury was observed leaking from the meter and water treatment plant personnel removed the meter from the lab, but this resulted in spillage in the hallway and stairwell of the plant. An unknown quantity of mercury was released.