Peeing in the shower is generally safe for most people and situations, as long as some common sense conditions are met.
Here’s a non-medical breakdown of what makes it safe and what doesn’t:
Why it is safe
Urine is sterile (in healthy individuals): it consists of 95% water and the rest consists mainly of urea and salts.

The showers are designed for drainage: everything you wash off your body—soap, sweat, dirt—goes down the same drain anyway.
The water flow will flush it away immediately, so it won’t linger or pose a hygiene risk (especially if you’re aiming for the drain).
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