In a part of Europe I’m familiar with many families still have (often inherited) family cottages in the country that, in modern times, serve as summer houses.

In a part of Europe I’m familiar with many families still have (often inherited) family cottages in the country that, in modern times, serve as summer houses. Many still have hand dug wells and septic tanks. Composting outside toilets are not unknown and were normal within living memory. Modern families often bring bottled water for drinking and brushing teeth. No matter that bottled water is expensive, it is massively cheaper than investing in a bored well etc. So I have no idea about “code” and other aspects of the US system or WA in particular, but i would put the cost on working water and waste at about $100 if you are the kind of person cut out for living off grid remote self sufficient and don’t mind grabbing a spade while the rest of us hang out online :)