Environmental

In North Dakota's oil country, 'produced water' from Bakken wells is regulated because:

AIt is clean and can be discharged freely
BIt contains naturally occurring radioactive materials and brine that can contaminate soil and groundwater✓ Correct
CIt is used for crop irrigation without treatment
DIt has no environmental impact

Explanation

Produced water from Bakken oil wells contains brine, hydrocarbons, and naturally occurring radioactive materials (NORM). Improper disposal can contaminate soil and groundwater, making it subject to strict North Dakota environmental regulations.

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