is there a scientific reason not to shower during a thunderstorm?
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Most comments are focused on the personal injury risk, but there is an environmental reason to limit your showers during a storm.
Many older cities (including much of NYC) use a [Combined Sewer](https://en.wikipedia.org/wiki/Combined_sewer) system which treats storm water and waste water together. During major storms it exceeds capacity and overflows, polluting the water nearby.
For this reason the [NYC Dept of Environmental Protection recommends you limit showers during a heavy storm](https://www.nyc.gov/assets/dep/downloads/pdf/water/stormwater/stormwater-management-protecting-our-waterways-ms4.pdf) (page 20 of the pdf).
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