Snake control can best be accomplished by depriving the snakes of the things they need to live. This includes harborage(a place to live and hide), food and water. In other words by keeping the weeds mowed around the building and keeping the rodent population at zero pretty well eliminates snakes in a residential area. But there are a number of ways to repel and trap snakes of all sizes.
SNAKE REPELLENTS
Dr.T's
Snake-A-Way is a granular product that the snakes smell with their
tongue. This irritates them and they move in the opposite
direction. 
Snake-a-way
is very repulsive to most snakes. Just a whiff of this product and
they go the other way. Dr. T's will last up to 3 months outside in
normal weather. A 4# container will treat the perimeter of a 1/4
acre lot.
It can be used to protect gardens, tree houses, well
houses, sheds, barns, etc.
It works really well as a perimeter around a camp site.
I know of several people who back pack this in and sprinkle it around
their tent at night before sleeping.
SNAKE TRAPS
Glue boards can also be used to catch snakes. For
small snakes and lizards the
mouse size glue board is all that you need. For very large snakes
try the Snake
Guard Glue Board. This will catch the largest rattler.
To release the snakes unharmed from the glue boards massage some cooking
oil into the glue holding the snake and than remove the glue and oil
from the snake with an oiled cloth.
Some combination of the above products and methods will prove effective in controlling all snakes, including copperhead, cottonmouth, garden, rattle and water snakes.
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