Sept 12 (Reuters) - Nuvista Energy Ltd NVA.TO :
* NUVISTA ENERGY LTD RESPONDS TO PRODUCED WATER LEAK
* PRODUCED WATER DISPOSAL PIPELINE HAS BEEN SHUT DOWN AND ISOLATED; THERE HAVE BEEN NO INJURIES
* SAYS ALBERTA ENERGY REGULATOR AND LOCAL STAKEHOLDERS WERE NOTIFIED.
* SAYS CAUSE OF LEAK HAS NOT YET BEEN DETERMINED