Mealey's (June 18, 2015, 9:22 AM EDT) -- SACRAMENTO, Calif. — A regulatory agency in the State of California on March 3 announced that it had ordered the closure of 12 underground injection wells used by hydraulic fracturing companies. The California Division of Oil, Gas and Geothermal Resources (DOGGR) said the wells needed to be closed to protect groundwater aquifers.

Injection Wells

The DOGGR said it is conducting a statewide review of injection wells used for disposing fracking waste.

Ten of the 12 injection well operators voluntarily relinquished their permits to inject pending the...