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I've always had French drains where I lived. My parents' current house also has a dispersal drain for gray waters / toilets associated with a sort of septic tank (true septic tanks are now forbidden).

This drain disperses water under some sort of front yard (it's the countryside...) where the grass consequentially has a very high growth rate...




Umm, why are septic tanks forbidden there?


Usually because waste water from putrefaction is loaded with nitrogen and bacteria that can contaminate ground water.


They are supposed to never leak right?


That depends on the principle, some are actually built to trickle and seep into the ground below.

Anyway I suppose that such concrete underground structures are often built on the cheap, and by the very nature of their content they're hard to inspect, so they're bound to develop a tendency to leak over the prospect of decades.




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