No, it is not safe to take a bath during a thunderstorm. Lightning can travel through your home’s plumbing and into the water you’re sitting in. The CDC explicitly advises against bathing, showering, washing dishes, or even washing your hands while a storm is active.
How Lightning Reaches Your Bathtub
Lightning enters buildings in three ways: a direct strike to the roof or structure, through wires or pipes that extend outside, or through the ground. Once that electrical current is inside your home, it follows conductive paths, and plumbing is one of the best conductors in a typical house. Metal pipes carry the charge efficiently, but even homes with modern plastic piping (like PEX) aren’t fully safe. The water inside those pipes conducts electricity too, because tap water contains dissolved minerals and ions that make it a conductor. So while the plastic itself doesn’t carry current, the water flowing through it does.
If lightning strikes your home, a nearby tree, or a utility line connected to your house, the electrical surge can travel through the plumbing system and energize any water you’re in contact with. A bathtub is especially risky because you’re submerged in water, maximizing your body’s contact with the conductive path. A shower carries similar risk since the water stream connects you directly to the plumbing.
The Risk Applies to All Water Use
Bathing gets the most attention, but the CDC groups all indoor water contact together. Showers, dishwashing, and even hand washing pose the same basic risk: your body completes an electrical circuit between the plumbing and the ground. The difference is really about how much of your body is in contact with water and how close you are to the fixtures. Standing in a shower with water running over your body or sitting in a full bathtub puts you in extensive contact. Quickly rinsing your hands is lower risk, but the CDC still recommends against it during active lightning.
Plastic Pipes Reduce but Don’t Eliminate Risk
The CDC notes that plastic pipes carry less risk than metal ones, since plastic itself is not conductive. Many newer homes use PEX or PVC plumbing instead of copper. However, the water inside those pipes still conducts electricity. And most homes have at least some metal components in their plumbing system: metal fittings, water heaters, or the grounding connections where pipes enter the house. A single metal section in an otherwise plastic system can still provide a path for lightning. This is why the official guidance makes no exception for homes with plastic plumbing.
How Long to Wait
The National Weather Service recommends staying indoors for 30 minutes after the last clap of thunder you hear. That same 30-minute window applies to using plumbing. Lightning can strike miles from the center of a storm, and the trailing edge of a thunderstorm carries just as much risk as the leading edge. If you hear thunder at 7:15 p.m. and nothing after that, you’d wait until 7:45 before turning on a faucet or stepping into the shower.
If thunder is rumbling continuously, the clock resets with each clap. The storm needs to fully pass before the risk drops.
Other Things to Avoid Indoors
Plumbing isn’t the only conductive system in your house. During a thunderstorm, you should also stay away from:
- Corded phones and wired electronics: Electrical wiring gives lightning a direct path into your home. Cordless and cell phones are fine since they aren’t physically connected to the wall.
- Electrical outlets and appliances: Avoid using anything plugged into an outlet. A lightning surge can travel through household wiring and damage both the appliance and anyone touching it.
- Metal window frames and doors: These can conduct current if lightning strikes the structure.
The safest place during a thunderstorm is indoors, away from windows, plumbing, and anything plugged in. Being inside a building dramatically reduces your risk compared to being outside, but that protection works best when you avoid the conductive paths that connect the interior of your home to the outside.
Putting the Risk in Perspective
Indoor lightning injuries through plumbing are uncommon. Most lightning injuries happen outdoors, and being inside a fully enclosed building is one of the most effective ways to protect yourself. But “uncommon” isn’t the same as “impossible,” and the consequences of a lightning strike are severe enough that the precaution is worth taking. If a storm rolls in while you’re about to hop in the bath, just wait the 30 minutes. It’s a small inconvenience for a risk that’s entirely avoidable.