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ENID, Okla. – Earthquakes have become top of mind for many homeowners and businesses across Oklahoma.

Recently, several homeowners in Oklahoma and Logan counties have filed class-action lawsuits against oil companies, claiming they are responsible for damage to their properties that were caused by earthquakes.

In the last several months, the Oklahoma Corporation Commission has cracked down on oil companies’ wastewater injection wells after a series of earthquakes rattled residents’ homes and nerves.

However, apparently not all the wastewater that is being put back into the ground in the Sooner State actually came from Oklahoma.

Enid News learned that there are several states that ship wastewater to be disposed in other states.

According to reports from the Oklahoma Corporation Commission obtained by Enid News, Oklahoma receives wastewater from Texas, Kansas, New Mexico, Colorado and Arkansas.

Oklahoma Corporation Commission spokesman Matt Skinner said Oklahoma is “pretty much an intake state,” adding that most of the out-of-state wastewater comes from Texas.

But Skinner says the wastewater from other states plays a very small role in the state’s earthquake issues.

In the third quarter of 2015, Oklahoma received more than 545,000 barrels of wastewater from other states, in addition to the 26 million barrels of wastewater Oklahoma produced.

Last year, Oklahoma pushed 1.5 billion barrels of wastewater back into the ground, commission officials told Enid News.