How Likely Is It to Get Struck by Lightning in the Shower?

Getting struck by lightning while showering is possible but extraordinarily rare. A systematic review of decades of lightning casualty data found just two deaths worldwide linked to indoor water-related activities like showering or washing dishes, and those represented roughly one-tenth of one percent of all lightning fatalities in the dataset.¹ The risk is real enough for safety agencies to warn against it, but small enough that most people will never personally know someone it happened to. The more interesting question is how it happens at all and what actually determines whether you are at risk.

How Lightning Reaches You Through Plumbing

When lightning strikes a building or the ground nearby, the electrical current does not simply stop at the roof. It travels along the paths of least resistance toward the ground, and metal plumbing pipes are excellent conductors. If a bolt hits a house or its immediate surroundings, the current can flow through metal water supply lines, along copper or galvanized steel pipes, and emerge through any fixture connected to them: a showerhead, a faucet, a bathtub drain. Water itself is a decent conductor when it contains dissolved minerals, which tap water always does. So a person standing under a stream of water connected to metal plumbing during a direct or nearby strike can become part of the electrical path.

This is not the same as a full, direct lightning strike hitting a person standing outdoors. The current that reaches an indoor plumbing fixture is typically a fraction of the total bolt energy, because the electricity splits among multiple conductive paths in the building’s structure. That is a major reason indoor lightning incidents tend to be far less severe than outdoor ones. But a fraction of a lightning bolt’s energy can still be enough to cause burns, cardiac disruption, or muscle contractions strong enough to cause a fall injury in a wet, slippery environment.

How Rare These Injuries Actually Are

The most thorough look at this specific question comes from a 2023 systematic review that examined the evidence behind the CDC’s indoor lightning safety guidelines. Researchers combed through published case reports, surveillance data, and injury databases spanning several decades. Across that entire dataset, they found 30 reports of injury from lightning while someone was doing an indoor water-related activity, and just two reports of death. The injuries represented about 0.7% of all lightning injuries in the sample, and the deaths about 0.1%.¹ About half of those incidents came from UK data collected between 1988 and 2012, while most of the rest were from the United States between 1990 and 2013. Strikingly, the review found no reports of anyone dying from an indoor water-related lightning strike in the US since 1988.

To put those numbers in perspective, the US averages roughly 20 lightning deaths per year (down from higher figures in earlier decades, largely because fewer people work outdoors). The chance that any one of those deaths involves someone in a shower is vanishingly small. You are far more likely to be struck while golfing, fishing, or mowing the lawn than while rinsing shampoo out of your hair.

Indoor Lightning Incidents Are Common but Rarely Dangerous

Here is where the data gets a little counterintuitive. Indoor lightning incidents are not as rare as you might expect, but they are overwhelmingly mild. A UK analysis of lightning casualties from 1988 to 2012 found that nearly half of all recorded lightning incidents involving people happened indoors. Yet outdoor incidents accounted for about two-thirds of all people actually struck, and while 44% of outdoor incidents resulted in serious injuries or death, only 2% of indoor incidents caused serious injury, and none were fatal.²

An earlier analysis covering 1993 to 1999 in the UK found a similar pattern: about 52% of lightning incidents affecting people happened indoors, but again, none of those were fatal.³ Most indoor incidents resulted in startling shocks, temporary numbness, minor burns, or equipment damage rather than the catastrophic injuries seen in direct outdoor strikes. The building itself absorbs and distributes the vast majority of the energy. What reaches a person inside is typically a side flash or a conducted current through wiring or pipes, not the full force of a cloud-to-ground discharge.

This pattern matters for the shower question specifically. Even if current does travel through your plumbing during a thunderstorm, the odds that it will deliver enough energy to seriously injure you are very low. The typical indoor lightning injury story involves a startling jolt, maybe a small burn where skin contacted a metal fixture, and a racing heart. Severe outcomes, like cardiac arrest or significant burns, show up in case reports but are genuinely exceptional.

Telephones Used to Be More Dangerous Than Showers

One of the more surprising findings in the historical data is that telephones, not showers, were the biggest indoor lightning hazard for decades. The 1993-1999 UK study found that a quarter of all indoor incidents where someone received a lightning-generated electrical shock involved a telephone, whether at home, in an office, or at a telephone exchange.³ Old landline phones were connected to copper wiring that ran from poles outside directly into the home, providing a conductive path straight to the user’s ear. One incident in the dataset involved seven telephone exchange operators in Scotland getting shocked simultaneously during a single strike.

This context is useful because it shows how indoor lightning risk is largely a product of what conductive pathways exist in a building and how directly they connect the occupant to the outside. As landlines have disappeared and been replaced by wireless phones, that particular risk has essentially vanished. The plumbing pathway remains relevant because metal pipes still physically connect the inside of a house to the ground and to exterior water mains, but even this pathway is changing as building materials evolve.

Metal Pipes, Plastic Pipes, and Modern Homes

The type of plumbing in your home matters. Older homes with copper or galvanized steel supply lines and cast iron drain pipes have a continuous metal pathway from the ground or the street main right up to your showerhead. These are the conditions under which the rare shower-lightning incidents in the historical record occurred. If your house was built before the 1990s and has not had its plumbing replaced, you likely have metal pipes.

Many newer homes, however, use PEX (cross-linked polyethylene) for water supply lines and PVC for drains. These plastic materials are poor electrical conductors. A house plumbed entirely with PEX and PVC has a far less conductive path between the ground and your shower. That does not make the risk perfectly zero, since other conductive elements like grounding wires, metal water heater connections, or a short metal section somewhere in the run can still carry current. But it does meaningfully reduce the already-tiny probability that lightning energy will reach you through your showerhead.

The same logic applies to grounding systems. Modern electrical codes require homes to have grounding electrodes and bonding that routes stray electrical energy safely to the earth. A properly grounded home offers lightning current an easier path to ground than through a person standing in a shower. Older homes with outdated or absent grounding systems provide less protection. This is one of several reasons why the historical incidents in the datasets skew toward older structures and earlier decades.

What Safety Agencies Recommend and Why

The CDC and the National Weather Service both advise people to avoid showering, bathing, and washing dishes during thunderstorms. This advice sometimes strikes people as overcautious, and the data reviewed above suggests the absolute risk is indeed extremely small. So why do these agencies maintain the recommendation?

Part of the answer is that even a very low-probability event is worth avoiding when the cost of avoidance is essentially nothing. Waiting 30 minutes to take a shower after the last thunderclap is a trivial inconvenience. The agencies are not claiming that showering in a storm is likely to kill you. They are saying that the risk, small as it is, is completely unnecessary to take. This is a different calculus from, say, advising people not to drive, where the risk may be higher but avoidance is impractical.

The recommendation also reflects the fact that indoor lightning injuries, while rarely serious, do happen with some regularity. The UK data showed that indoor incidents made up nearly half of all recorded events, even though most were minor.² A painful shock through a showerhead during a thunderstorm is an experience most people would prefer to skip, even if it falls well short of a medical emergency.

How Many People Actually Know About This Risk

Surveys suggest that awareness of indoor lightning risks, including the shower advice, is lower than you might expect. A study of over a thousand respondents in Malaysia found that while about 74% agreed people should avoid showering during thunderstorms, the remaining quarter either disagreed or were undecided. On a more basic question, roughly 30% of respondents either believed or were unsure whether being inside a house makes you 100% safe from lightning.⁴

Malaysia is one of the most lightning-prone countries on Earth, so these awareness gaps are not just academic. But the misconception that a building provides complete protection is common everywhere. People tend to think of lightning as a purely outdoor hazard, which is understandable: outdoor strikes get the dramatic news coverage, and outdoor deaths vastly outnumber indoor ones. The subtler point, that a building protects you from the worst outcomes but does not eliminate all conductive pathways to your body, is the kind of nuance that gets lost in casual understanding.

Other Indoor Activities That Carry Similar Risk

Showering gets most of the attention, but any activity that puts you in contact with plumbing or wired infrastructure during a thunderstorm carries a comparable level of risk. Washing dishes with running water, filling a bathtub, and hand-washing laundry in a sink all involve the same conductive pathway through metal plumbing. The historical case reports from the systematic review grouped all of these under “indoor water-related activities,” and the 30 injury cases included people doing various tasks at sinks and tubs, not just showering.¹

Corded electronics are another pathway, though a less common one now that most personal devices are wireless and battery-powered. A desktop computer plugged into a wall outlet and connected to a wired ethernet cable has two conductive connections to the outside world: the power line and the data cable. Surge protectors help, but a close lightning strike can overwhelm a consumer surge protector. The safest posture during an active thunderstorm overhead is simply to avoid contact with anything that has a wired connection running outside the building’s envelope, whether that is a pipe, a phone line, or an electrical cord.

When the Risk Is Highest

Not all thunderstorms pose the same level of indoor lightning risk. The chance that current reaches your plumbing depends on a bolt actually striking your house or the ground very close to it. For a typical single-family home, the target area is tiny compared to the landscape around it. A thunderstorm rumbling several miles away poses minimal risk to your plumbing. The danger window is specifically when lightning is striking in your immediate vicinity, which usually means the storm is directly overhead or within a mile or two.

The classic “30-30 rule” offers a rough guide: if the time between seeing a flash and hearing the thunder is 30 seconds or less, the lightning is within about six miles, and you should already be indoors. The plumbing-avoidance advice applies during that window and for 30 minutes after the last observed flash, since storms can produce trailing strikes well after the heaviest rain passes. In practice, the storms that pose real indoor plumbing risk are the ones that make the lights flicker and produce those sharp, instantaneous crack-boom sounds rather than long, rolling rumbles.

Geography plays a role too. Areas with higher lightning flash density, like the Gulf Coast of the United States, central Florida, and tropical regions near the equator, see more residential strikes simply because there are more bolts per square mile per year. If you live in a high-flash-density area and your home has older metal plumbing and less-than-ideal grounding, the shower-during-a-thunderstorm scenario is slightly more plausible for you than for someone in a newer home in a region that sees only a handful of storms per summer. Even then, “slightly more plausible” still means the absolute risk is very small. The evidence strongly suggests that the most dangerous thing you can do during a thunderstorm is be outside in an exposed location, and everything else is a distant second.

Lightning Rods and Whole-House Protection

Lightning protection systems, commonly called lightning rods, are designed to give a bolt a preferred path from the top of a structure straight to the ground, bypassing the building’s interior wiring, plumbing, and occupants entirely. A properly installed system includes air terminals (the rods on the roof), heavy-gauge conductors running down the exterior walls, and grounding electrodes buried in the earth. When lightning hits a protected building, the vast majority of the current follows this external pathway rather than exploring the internal infrastructure.

These systems are standard on commercial buildings, communication towers, and many public structures, but relatively uncommon on residential homes. The cost of retrofitting a lightning protection system on an existing house runs into the thousands of dollars, which is hard to justify when the annual probability of a direct strike on any given house is low. Still, for homes in high-lightning areas, especially those with metal roofs, tall chimneys, or hilltop locations that make them more likely strike targets, a protection system essentially eliminates the indoor plumbing risk along with other lightning-related damage. If you have ever wondered whether a lightning rod would make your home safer for showering during a storm, the answer is effectively yes, though the primary justification for installing one is protecting the house from fire and electrical damage rather than protecting the shower occupant.