Power on a dock makes it usable after dark and runs the boat lift, but it is also the one part of a dock that can kill someone in the water. A safe dock electrical system has ground-fault protection on every circuit, wire and fittings rated for wet locations, runs planned into the frame so nothing hangs loose, and an annual check by a licensed electrician. On Lake Travis and Lake Austin, lighting, shore power and lift wiring usually add $3,000 to $9,000 to a new dock, depending on how far the run is from the house.
This guide covers electric shock drowning and how to prevent it, what a dock electrical system needs, how to protect wiring from water, sun and movement, what it costs, and the warning signs that mean a system needs attention now.
What Is Electric Shock Drowning?
Electric shock drowning happens when electrical current leaks into the water from a dock, a boat or a lift and passes through a swimmer. Even a small current can paralyze the muscles, so the swimmer cannot stay up or swim away. There is often no visible sign that anything is wrong, and the victim usually shows no burns.
Fresh water is more dangerous than salt water, because the human body conducts electricity better than fresh water does, so the current takes the path through the swimmer. Lake Travis and Lake Austin are fresh water, and many docks there were wired decades ago without the protection current codes require.
The rules that prevent it:
- Never swim within 100 yards of a dock, lift or boat that has power on.
- If you feel tingling in the water, do not swim toward the dock or grab a metal ladder. Swim for a stretch of shoreline well away from it, and shout for others to stay out of the water.
- If someone in the water seems frozen or unresponsive near a dock, do not jump in. Shut off the power at the source, then reach, throw or row to them with a flotation device, and call 911.
- Put ground-fault protection on every dock circuit and test it monthly with the test button.
- Have a licensed electrician check the system every year and after any storm or flood.
What Does a Safe Dock Electrical System Need?
Ground-fault protection on every circuit. Since 2017 the National Electrical Code has covered docks at one- and two-family homes under Article 555, and it requires ground-fault protection on dock power. GFCI outlets and breakers trip the moment current leaks somewhere it should not, which is what stops a leak before it reaches the water. An older dock without them is the single biggest electrical risk on the lake.
A dedicated feed from the house. The dock should have its own circuit or subpanel with a disconnect you can reach from shore, so power can be cut without walking onto the dock.
Wet-location rated equipment. Outlets, boxes, lights and switches on a dock need to be rated for wet locations, with in-use covers that stay closed with a cord plugged in.
Proper grounding and bonding. Metal parts of the dock, the lift and the electrical equipment need to be bonded so a fault trips the breaker instead of energizing the frame.
A licensed electrician and a permit. Dock wiring is not a weekend project. A licensed electrician should do the work and pull whatever electrical permit your jurisdiction requires. On Lake Austin, City of Austin review applies.
How Do You Protect Dock Wiring From Water and Movement?
Use cable and conduit made for the setting. Wiring on a dock sees water, sun and constant movement. Use wet-location rated conductors in sealed, UV-resistant conduit, and keep it off the walking surface.
Route it where water cannot collect. Run wiring along the high side of the frame, slope conduit so water drains out, and use drip loops at boxes so water runs off instead of into the connection.
Give it slack where the dock moves. On a floating dock on Lake Travis, the gangway hinge and the shore connection move every time the lake rises or falls. The cable there needs a flexible, protected loop sized for the full range of travel. A cable pulled tight at low water will eventually tear out.
Keep it away from heat, friction and moving parts. Wiring should not rub on the frame, sit against a lift motor or cross the path of lift cables.
Seal every connection. Corrosion starts at connections. Use marine-grade connectors, dielectric grease where appropriate, and sealed boxes, and keep dissimilar metals apart.
Plan access before the decking goes down. Junction boxes and runs should be reachable without pulling up boards. On a new dock, we plan the electrical into the frame so it is hidden but still serviceable.
What Does Dock Electrical Work Cost?
| Item | Typical cost | What drives it |
|---|---|---|
| Lighting, shore power and lift wiring on a new dock | $3,000 to $9,000 | Run length from the house and the number of GFCI-protected circuits |
| Post or corner lights | $15 to $50 per light, plus install | Brightness and fixture quality |
| LED strip lighting | $40 to $150 per 10 feet, plus install | Quality, brightness and length |
| Underwater lights | $30 to $100 per light, plus $300 to $800 to install | Number of lights and the run |
Basis: Longhorn Docks quotes, 2025 to 2026, and our dock lighting guide. Upgrading an older dock to current ground-fault protection is quoted after an electrician’s inspection.
Which Warning Signs Mean Your Dock Wiring Needs Attention?
- A GFCI that trips often, or one that does not trip when you press the test button
- Any tingle from the dock, a ladder, the lift or the water
- Cords run from the house instead of fixed wiring
- Cracked, sun-faded or chafed cable, or conduit that has pulled apart
- Outlets without in-use covers, or covers that no longer close
- Corrosion or green residue at boxes and connections
- Lights that flicker, or a lift that runs slow or trips the breaker
- A dock that was flooded or damaged in a storm and has not been checked since
If you notice any of these, shut off power to the dock at the house, keep everyone out of the water near it, and have a licensed electrician inspect it before turning it back on.
When Should Dock Electrical Be Redone?
Most older docks on Central Texas lakes have wiring that was added piece by piece over the years. If the dock has no ground-fault protection, relies on extension cords, or the wiring is exposed and sun-damaged, it is due for an upgrade. A renovation or a new lift is the best time to do it, because the runs can be rebuilt into the frame instead of added on the outside. Our dock renovation page covers what a full rebuild includes.
Dock Electrical FAQs
How do you prevent electric shock drowning at a dock?
Put ground-fault protection on every dock circuit and test it monthly, have a licensed electrician inspect the system every year, and never swim within 100 yards of a dock or boat that has power on. If you feel tingling in the water, swim away from the dock toward another stretch of shore, not toward the dock.
Do boat docks need GFCI protection?
Yes. The National Electrical Code covers residential docks under Article 555 and requires ground-fault protection on dock power. It is the most important electrical safety feature a dock can have.
How much does it cost to run electricity to a boat dock?
On a new dock, lighting, shore power and lift wiring usually add $3,000 to $9,000, depending mostly on how far the run is from the house and how many circuits the dock needs.
Can I wire my own boat dock?
It is not a good idea. Dock wiring combines water, movement and people swimming nearby, and mistakes can be fatal. A licensed electrician should do the work and pull any permit required.
Plan Power Into the Build
The safest dock wiring is the kind planned before the frame is built, with runs hidden in the structure and every circuit protected. Tell us your lake, what you want to power and how far the dock is from the house, and we will price the electrical as its own line. Start on our dock construction page or call (512) 200-4244.