Fire hydrant buried by snow

So I have a fire hydrant on my lawn that due to the snow falls and me shovelling snow onto my lawn has become buried. I have shovelled it out a couple of times already this winter, but with this last snow fall it will have to be done again. Is the city responsible for keeping them clear or the homeowner? Years ago in the winter I thought they use to attach a long arm on one for the outlets flagging the location of the hydrant for the fire department.