there were no nationwide regulations in Switzerland that prohibit flushing the toilet after 10 PM or prohibit individuals from having their own washing machines. It's important to note that rules and regulations can vary by region or even within specific housing complexes, so it's possible that there might be some local restrictions or guidelines in certain areas. However, such restrictions would not be representative of the entire country.
To get the most accurate and up-to-date information, it's best to consult local authorities, housing management, or individuals living in Switzerland to understand any specific rules or guidelines that may apply in a particular location.