(Oceanside, OR)  --  Officials are warning Oceanside residents not to drink the tap water after someone claimed to have poisoned the water reservoirs.  Tillamook County Emergency Management says the person made that claim to police yesterday.  Officials say they've inspected the reservoirs and that there's no evidence of tampering.  However, officials are urging residents to avoid drinking tap water until after they've flushed the system and have had the water tested.