the waste matter that passes through sewers.
Also, sewerage.

1825–35; sew(er)1 (as if the ending was -er1) + -age Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sewage (ˈsuːɪdʒ)
waste matter from domestic or industrial establishments that is carried away in sewers or drains for dumping or conversion into a form that is not toxic
[C19: back formation from sewer1]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1834, from sew (v.) "to drain, draw off water" (late 15c.), from sewer.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Knowing the past means knowing what people carried in their pockets, what they
  did with their sewage, where their dogs slept.
For example, if you talk about microbiology, a trip to a brewery or the sewage
  treatment plant would be relevant.
Better water and sewage systems and a more responsive, efficient power grid are
  vital to maintain our standard of living.
He improved water supplies, sewage disposal and city streets.
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