I'm doing a paper on the Sewage systems of Great Britain, Mexico, and the USA. Currently I am stuck as I can't find any information pertaining to Mexico's history of sewage. I know that England would throw it's waste in the streets but what did Mexico do?
A few years back I visited Monte Albán the Zapotec capital in Oaxaca and was surprised to learn that the had a fully functioning drainage/sewage and water storage system built up there on the hill. If you go there today you will see the remains of the excavated water system.
http://www.latinamericanstudies.org/academic/zapotecs.pdf http://www.mexonline.com/oaxaca/oxarc101.htm http://www.ancient-wisdom.co.uk/mexicomontealban.htm