According to Statoil Drilling, the owner and operator of the well pad, testing began shortly after the incident on June 28. The company reports air sampling and analysis show there are no health hazards, and the company said they will continue to test for potential environmental impacts at the site and in the immediate vicinity.
The U.S. Environmental Protection Agency, Ohio Environmental Protection Agency, and the Ohio Department of Natural Resources also continue to investigate the incident.
Authorities said a tubing malfunction led to the well pad fire that spread to about 20 trucks on the pad and set off explosions. Some families living nearby had to be evacuated temporarily.