Yep, most likely a watersnake. They will bite if you agitate them, but are non-poisionous. The endangered Easter Massasauga rattlesnake is about the only snake to worry about in Northern IL. There was a dog bitten by one in Mchenry County last month. Probably have a better chance of being struck by lightning then ecountering one of those though.spiroh said:2 years ago I called to the office to let them know about the snake situation at Lk Glenview. Long story short, these are water snakes and are not poisonous, though they will bite.