Tom and Jenny Lisak noticed the changes earlier this week.

That natural spring has provided water for their farm for more than a century.

The Lisaks admit they don't know what sparked the changes at the spring.

However, they told WJAC-TV that there's plenty of natural gas drilling near their farm.

Specialists from one gas company and the DEP have tested the water.

Officials from Exco Resources, which has a natural gas well near the farm, said the preliminary results of those tests indicate their operations are not behind the changes in the water.

The Lisak family is now using a tank of water pumped before the spring turned red.

But they told WJAC-TV, after that runs out, they'll need to find somewhere else to get water.