Septic tank
01
浄化槽, し尿タンク
an underground container that treats household wastewater by allowing solids to settle and separate from the liquid before further treatment or absorption into the soil
例
The plumber came to check if the septic tank needed to be emptied.
配管工が、浄化槽を空にする必要があるかどうかを確認しに来ました。
