It may not be illegal but a deputy will have a chat with a neighbor that blows snow over a fire hydrant on the edge of your property that is supposed to protect both his house and yours and leave it to you to shovel out the extra deep snow he blew there. Sometimes you can fix stupid. It wasn't a matter of pay back. He was at least 20 yrs. my junior and I was not physically able to shovel heavy snow. He also is not the kind of neighbor I could have a friendly chat.