As a native Californian, I still feel a bit of worry when I let the water run, like I see so many Norwegians do. It's standard: They let it run to get it nice and cold. They well afford to: The one place that never seems to run out of fresh water is Norway. The never-ending supply of that most vital of fluids can lead to some bad habits and disappointments. Norwegians are always faced with culture shock when they leave their country, because the moment you set foot in Denmark, you get recycled water. Norwegians always complain about how tap water tastes elsewhere. They also complain about being told not to waste the water, especially when they want to shower every day just like they do at home.
Norwegians are encouraged to take shorter showers at home, but this has nothing to do with water and everything to do with the price of electricity—used to heat up the water.
During lunch at my first job in California, the discussion turned to personal hygiene. The showers-every-day woman chewed out the showers-every-two-days woman. As the discussion went on, it became clear that showering every two days was the norm around the table. I still have that habit.
Californians don't shower as much as Norwegians (or that one co-worker) do because we, a) have dry heat so we don't sweat much, and b) are always told to save water. Since I don't have a job that makes me sweat and I don't live in a hot climate, there's no reason to shower more often.
Also as a Californian, I have so wished that the record-breaking rains Bergen, Norway, had last year could have been sent to my home state. It has felt almost unfair that there is so much water falling from the sky in a place that doesn't need it, while completely bypassing a place that desperately does.
I'll keep my California habits. They serve me well the moment I go traveling. I will drink recycled tap water in Germany and I will limit my showering in Spain. After all, it is Norway's fresh and clean wetness that is the exception.