The City of Hood River has narrowed the area a boil water advisory has been issued as a precaution in the wake of last night’s water main leak to downtown Hood River from Sherman to Columbia avenues east of 9th Street.  City Public Information Officer Don Cheli says originally the advisory was for the entire City, they have now narrowed down the area impacted.  He adds state regulations require after this kind of leak water samples be submitted for testing for harmful bacteria and a boil order put in place until the results come back in 24 to 48 hours.  Water users in the core area from Sherman to Columbia avenues east of 9th Street or those who experienced a loss of water pressure or discovered an excessive amount of air in water lines to follow the boil advisory, bringing water to a rolling boil for one full minute, then allow it to cool before using or storing.  Cheli says the leak occurred on 3rd Street near Cascade Avenue near the Union Building.  No cause has been determined.