The most effective way to get rid of water snakes is to make your property less attractive to them by removing their food sources and shelter. Water snakes are non-venomous and generally beneficial predators, but if they’ve taken up residence around your pond, dock, or lakefront property, habitat modification and physical barriers will do far more than any repellent on the market.
Before taking action, it’s worth confirming what you’re actually dealing with. Many people mistake harmless water snakes for venomous cottonmouths, and the strategies differ depending on the species.
Make Sure It’s Actually a Water Snake
Water snakes (genus Nerodia) are non-venomous and often confused with cottonmouths, also called water moccasins. This distinction matters because cottonmouths are venomous and require more cautious handling, while water snakes pose no real danger beyond a defensive bite if grabbed.
One useful field clue is how the snake swims. Water snakes swim with their bodies just below the surface, while cottonmouths tend to float on top of the water with their entire body visible. This isn’t foolproof, since some other non-venomous species also float, but it’s a helpful starting point. Cottonmouths also have thicker, blockier heads, vertical slit pupils, and a distinctive white mouth lining they display when threatened. Water snakes have rounder heads, round pupils, and will typically flee rather than hold their ground.
If you’re in the northern half of the United States, cottonmouths aren’t in your range at all. They’re limited to the Southeast and parts of the Midwest. If you’re seeing snakes near water in New England, the Great Lakes region, or the Pacific Northwest, they’re almost certainly non-venomous water snakes.
Remove Their Food and Shelter
Water snakes stick around because your property provides what they need: food and cover. They eat fish, frogs, small mammals, insects, and even ducklings and bird eggs from nests near the water’s edge. If your shoreline supports a thriving population of frogs or small fish in shallow, weedy areas, you’re essentially running a buffet.
The most impactful change you can make is reducing cover on the bank slope above the waterline. Mow regularly on the upper bank, and minimize trees and shrubs on the slope itself. Rock piles, stacked firewood, dense brush, and debris near the water all provide hiding spots. Remove or relocate these away from the shoreline. However, plants right at the water’s edge serve important roles in preventing erosion and filtering runoff, so Clemson University’s extension program recommends protecting that immediate shoreline vegetation even as you clear the slope above it.
Reducing the prey population also helps. If your pond is overstocked with small fish or has thick vegetation that harbors large frog populations, thinning those out will make the area less appealing. Keeping grass short and eliminating ground-level cover forces snakes into the open, where they feel vulnerable to predators like hawks. Most snakes will simply relocate to better habitat on their own.
Install Snake-Proof Fencing
If you want to protect a specific area like a dock, pool, or section of yard, physical exclusion fencing is the most reliable barrier. The standard approach uses quarter-inch galvanized hardware cloth, which is fine enough to block even juvenile snakes. Mesh sizes of three-eighths inch or larger can let small or narrow-bodied snakes slip through.
A common design uses 36-inch-wide mesh. Bury the bottom edge at least 6 inches underground to prevent snakes from pushing underneath. The remaining above-ground portion should be angled outward at roughly 30 degrees from vertical, which makes it much harder for snakes to climb over. Make sure the fence has no gaps at gates, corners, or where it meets structures. Snakes are remarkably good at finding small openings.
This type of fencing works well for enclosing a yard or creating a buffer zone between the water and your living space. It won’t keep snakes out of the water itself, but it can effectively keep them off your property.
Why Chemical Repellents Don’t Work
Snake repellents are one of the most commonly purchased and least effective wildlife control products. The National Pesticide Information Center notes that mothballs, one of the most popular home remedies, have little effect on snakes and aren’t intended or labeled for that use. Mothballs contain naphthalene or paradichlorobenzene, both of which can be toxic to pets, children, and aquatic life if scattered near water.
Commercial snake repellents do exist, and some carry EPA registration. But even these come with caveats: they can pose risks to people, pets, and the environment if not used exactly as directed. Around ponds and waterways, the risk of chemicals leaching into the water makes repellents especially problematic. Any product you consider should specifically state on its label that it’s designed for snake repellent use. Even then, don’t expect dramatic results. No repellent will override the draw of abundant food and shelter.
Trapping and Relocation
Minnow traps placed along the water’s edge can catch water snakes, which enter them while hunting fish. Commercial snake traps with glue boards also work on land near known travel routes. If you catch a water snake, relocate it at least a mile away to a suitable waterway. Closer than that, and the snake may find its way back.
Check traps frequently, at least once daily. Snakes caught in glue traps can die from heat exposure or stress if left too long, and non-target animals like turtles and frogs can also get caught. Vegetable oil can release a snake from a glue trap without harming it.
Legal Protections to Know About
Before killing or removing water snakes, check your state’s wildlife regulations. Some water snake species are legally protected. The Lake Erie water snake, for example, was federally listed as threatened until its recovery led to delisting, but it remains classified as endangered under Ohio state law. Killing one is illegal regardless of where it’s found on your property.
Many states protect all native snake species or require permits for capture and relocation. Even in states without specific protections for water snakes, local ordinances may apply. Your state wildlife agency’s website will have the current rules, and most offer a phone line where you can ask about specific species.
Putting It All Together
The approach that actually works combines several strategies. Start by clearing cover on the bank slope: mow regularly, remove brush piles and debris, and thin out dense vegetation above the waterline. If you want to protect a specific area, install quarter-inch hardware cloth fencing buried 6 inches deep and angled outward. Reduce prey populations where possible by managing pond vegetation and fish stocking levels. Skip the mothballs and chemical repellents.
Water snakes are persistent when habitat conditions are good, so these changes may take a few weeks to show results. Most snakes will leave on their own once food and cover disappear. For large populations or situations involving venomous species, a licensed wildlife control operator can assess your property and handle removal safely.