DC introduced its first sewer system in 1885, for example http://www.sewerhistory.org/chronos/new_amer_roots.htm DC introduced its first sewer system in 1885, for example DC introduced its first sewer system in 1885, for example http://www.sewerhistory.org/chronos/new_amer_roots.htm http://www.sewerhistory.org/chronos/new_amer_roots.htm http://www.sewerhistory.org/chronos/new_amer_roots.htm