Copperheads' bite is enough to send you to the hospital, but it is rarely fatal. Knowing what to do to keep them away will help reduce the chances you or anyone you know will get bitten.
Rodents in or around your house will be one of the biggest things that attract copperhead snakes. Copperheads will chase after birds and their eggs, frogs, and other small animals that they can snack on.
Covered areas out of the sun are where copperheads and several other types of snakes like to spend their days. Snakes will hide under shed roofs, garden hoses, picnic tables, firewood, and anything else that provides decent cover.
Snakes will generally only hide around water sources if there is somewhere that gives them cover. Keeping the grass short and moving other structures away from ponds and birdbaths will help reduce the chances any snakes try to call it their home.
By far, the biggest thing you can do to repel snakes is to keep your lawn and home in good condition. If you do spot a copperhead, you should call the authorities to come to remove it.