different between sewerage vs sewage

English

sewer +? -age

sewerage (countable and uncountable, plural sewerages)

A sewer system.
Misspelling of sewage.
- 2010, India Today 5 Apr 17
  About 3.6 billion tonnes of untreated sewerage flows daily into the Yamuna, which supplies over 60 percent of Delhi's water.

From sewer (“system of pipes used to remove human waste and to provide drainage”) +? -age or from sew (“to drain or draw off water”) + -age.

sewage (countable and uncountable, plural sewages)

A suspension of water and solid waste, transported by sewers to be disposed of or processed.
(obsolete) sewerage.

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