Two months after a fracking leak in Bradford County, Pa., federal officials have determined three nearby wells show signs of contamination.
The Environmental Protection Agency says water samples from three private wells are contaminated, though the Associated Press reports EPA spokesman Roy Seneca has declined to reveal the nature of the contamination.
Seven wells were tested in all, and the contaminated samples will be tested again in July.
Thousands of gallons in chemical-rich fracking fluid spilled into Bradford County after a well blowout there in April. The site is operated by Chesapeake Energy, which operates more than 100 Marcellus Shale drilling sites. The company resumed fracking last month.