Cesspool

(n.) A cistern in the course, or the termination, of a drain, to collect sedimentary or superfluous matter; a privy vault; any receptacle of filth.

Thesaurus Entries

Sodom, bog, cesspit, cloaca, cloaca maxima, den, drain, dump, garbage dump, marsh, mire, pandemonium, quagmire, septic tank, sewer, sink, sty, sump, swamp