Lake Texcoco was the largest of the five

Lake Texcoco was the largest of the five interconnected lakes. Since it formed in an endorheic basin lake, Lake Texcoco was brackish. During the reign of Moctezuma I, the "levee of Nezahualcoyotl" was constructed, reputedly designed by Nezahualcoyotl himself. Estimated to be 12 to 16 km (7.5 to 9.9 mi) in length, the levee was completed circa 1453; the levee kept the spring-fed fresh water in the waters around Tenochtitlan and kept the brackish waters beyond the dike, to the east.
Two double aqueducts, each more than 4 km (2.5 mi) long and made of terracotta,[2] provided the city with fresh water from the springs at Chapultepec. This was intended mainly for cleaning and washing. For drinking, water from mountain springs was preferred. Most of the population liked to bathe twice a day; Moctezuma was said to take four baths a day. As soap they used the root of a plant called copalxocotl (Saponaria americana);[3] to clean their clothes they used the root of metl (Agave americana). Also, the upper classes and pregnant women enjoyed the temazcalli, which was similar to a sauna bath and is still used in the south of Mexico; this was also popular in other Mesoamerican cultures.



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