Section 120-N. Maps and plans of sewers

Before taking any proceedings for
  the construction of any sewer or of any  system  of  sewers  or  of  any
  addition   thereto   or   alteration   thereof,   such  municipality  or
  municipalities acting severally or jointly shall cause to be made a  map
  and  plan  therefor,  or  an  amendment  of  any map and plan previously
  approved, as the case may be, and shall submit the  same  to  the  state
  commissioner  of health for his approval, and upon his approval the same
  shall be filed in his office.  A copy of such map and  plan  or  of  any
  such amendment thereof shall also be filed in the office of the clerk of
  each   such  municipality.     Any  such  map  and  plan  shall  include
  specifications of dimensions, connections and outlets or sewage disposal
  works and may also include any existing sewer which it  shall  be  found
  feasible and proper to incorporate or include in the proposed system. No
  work  of  any  kind shall be done on or for the construction, extension,
  reconstruction, removal or modification of any system of  sewers  or  of
  any  sewer thereof until a map and plan covering the entire system shall
  first have been duly approved and filed as above provided,  and  in  the
  execution  of  the  construction,  extension, reconstruction, removal or
  modification of any  system  of  sewers  or  of  any  sewer  thereof  no
  deviations  from  the  plans as finally approved and filed shall be made
  until plans or descriptions adequately showing such deviations are first
  approved and filed as above provided. The state commissioner of  health,
  in  approving  said  map  and plan or by a certificate supplementing any
  such approval, may authorize  such  municipality  or  municipalities  to
  temporarily  omit  or  defer the construction of any portion of any such
  sewer or system of sewers. A copy or copies of his approval  or  of  any
  such   supplemental   certificate   shall  be  certified  to  each  such
  municipality and filed in the office of the clerk thereof.