Yup. Complete lack... which is why they were still tossing the contents of chamber pots out of upper floor windows until the Victorian Age. "Gardy Loo!" and all that.... ;p Observant eyes noticed the chamber pots under the beds in the Bree scene in LOTR. However, some castles did have privy systems where there was a outlying room on a floor with drop-shaft for the effluent. The bottom of the shaft hung outside the walls. One castle was taken because the invaders climbed up through this drop-shaft. [no emoticon for this experience] Real sewers where water flushed through the channels may have been found in the occasional Roman villa, bathhouse, or fortification but most such structures were largely ruined and/or built-over by the Middle Ages. Carolly